Air Suspension Control Module (RLM): DTCs

AIR SUSPENSION CONTROL MODULE (RLM) DTCs

DTC	Description	Possible Causes	Action
B1A84-55	Car Configuration Data - Not configured	System not configured Data does not match that expected for specification Incorrect software version loaded	Configure the car configuration file (CCF) using the approved diagnostic system. Ensure the ride levelling control module software is the correct version (available from the Global Technical Reference web-site). Clear the DTC and test for normal operation.
C112F-72	Air Spring Valve - Actuator stuck open	Corner valve stuck open (fully or partially) Vehicle driven while system in "Tight Tolerance" mode	Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Complete corner valve checks. If necessary, clear tight tolerance mode. Clear the DTC and retest.
C1130-66	Air Spring Air Supply - Signal has too many transitions/events	Air spring leak Leak in air harness to air spring Corner valve leak to gallery Compressor assembly fault Vehicle driven while system in "Tight Tolerance" mode	Visually inspect the system for air leakage. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1130-7A	Air Spring Sir Supply - Fluid leak or seal failure	Detached or burst air pipe Leaking air spring or pipe to air spring (large leak) Loose pipe connection Insufficient pressure from compressor Height sensor fault	Visually inspect the system for an excessive air leak. Check the height sensor linkage(s) for damage/restrictions. Visually inspect the air harness for evidence of melting, crushing, kinking or collapsing. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1131-92	Air Supply - Performance or incorrect operation	Loose or burst air pipe Detached air pipe Leaking pipe from reservoir valve block to air supply unit or either axle valve block Insufficient pressure from compressor Reservoir valve block piped incorrectly	Visually inspect the system for air leakage. Check the reservoir valve block pipes for correct routing and installation.
C1138-23	Access Switch - Signal stuck low	Switch signal stuck low (switch on driver's door) Switch harness short to ground Switch stuck in pressed position Driver's door switch pack faulty	Check the access switch operation and repair/renew as necessary. Refer to the electrical circuit diagrams and check the wiring harness between the access switch on driver's door and the air suspension control module for continuity. Repair/renew as necessary.
C1A01-19	LED - Circuit current above threshold	Switch pack LED circuit current above threshold LED cathode (negative) connection shorted to positive One or more LEDs short circuit	Refer to the electrical circuit diagrams and check the LED_NEG circuit between the air suspension control module and switch pack for short circuit to power. Repair as necessary. Clear the DTC and test for normal operation. If the DTC is still logged suspect the switch pack.
C1A03-1C	Left Front Height Sensor - Circuit voltage out of range	Height sensor disconnected Height sensor harness wiring short circuit to ground, short circuit to power or high resistance Height sensor fault	Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Check sensor signal changes when sensor is rotated. If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Calibrate the system using the approved diagnostic system.
C1A03-26	Left Front Height Sensor - Signal rate of change below threshold	Sensor signal rate of change below threshold/signal voltage stuck Height sensor linkage disconnected Height sensor fault Height sensor harness wiring short circuit to ground, short circuit to power or high resistance	Check height sensor linkage is connected and not damaged. Visually inspect the height sensor for security, damage and correct orientation/installation. Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Repair/renew as necessary. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A03-27	Left Front Height Sensor - Signal rate of change above threshold	Left-hand front height sensor signal rate of change above threshold Height sensor harness wiring short circuit to ground, short circuit to power or intermittent connection Height sensor fault	Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Visually inspect the height sensor for security, damage and correct orientation/installation. Repair/renew as necessary. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A03-29	Left Front Height Sensor - Signal invalid	Left-hand front height sensor signal invalid Incorrect height calibration process	Calibrate the system using the approved diagnostic system.
C1A03-78	Left Front Height Sensor - Alignment or adjustment incorrect	Sensor alignment or adjustment incorrect; signal out of range Height sensor linkage not connected Height sensor linkage toggled Height sensor loose Height sensor bracket bent Incorrect height calibration Wiring to height sensor short to ground Wiring to height sensor short to other cable Height sensor electrical fault	Check height sensor linkage is connected and not damaged. Visually inspect the height sensor for security, damage and correct orientation/installation. Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Repair/renew as necessary. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Calibrate the system using the approved diagnostic system.
C1A03-92	Left Front Height Sensor - Performance or incorrect operation	Left-hand front height sensor height performance not as expected/signal changing slower than expected Axle valve block pipes connected incorrectly Height sensor incorrectly installed Blocked/damaged or crushed gallery pipe Blocked/damaged or crushed air spring pipe Corner valve stuck closed (mechanically) Reservoir valve stuck open (mechanically)	NOTE: If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Check that the vehicle is free of obstructions. Check the height sensor for correct installation and torque of fixings. If necessary, calibrate the system using the approved diagnostic system. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check for an air spring leak. Check the air harness for evidence of melting, crushing, kinking or collapsing. Check the front and rear valve block pipes for correct routing and installation. Refer to the approved diagnostic system for corner, reservoir and exhaust valve checks. Check the corner valve for leaks.
C1A04-1C	Right Front Height Sensor - Circuit voltage out of range	Right-hand front height sensor signal voltage out of range Height sensor disconnected Height sensor harness wiring short circuit to ground, short circuit to power or high resistance Height sensor fault	Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Check sensor signal changes when sensor is rotated. If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Calibrate the system using the approved diagnostic system.
C1A04-26	Right Front Height Sensor - Signal rate of change below threshold	Right-hand front height sensor signal rate of change below threshold/signal voltage stuck Height sensor linkage disconnected Height sensor fault Height sensor harness wiring short circuit to ground, short circuit to power or short to each other	Check height sensor linkage is connected and not damaged. Visually inspect the wiring harness and connectors for water ingress. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A04-27	Right Front Height Sensor - Signal rate of change above threshold	Right-hand front height sensor signal rate of change above threshold Height sensor harness wiring short circuit to ground, short circuit to power or high resistance Height sensor fault	Visually inspect the wiring harness and connectors for damage or water ingress. Visually inspect the height sensor for security, damage and correct orientation/installation. Repair/renew as necessary. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A04-29	Right Front Height Sensor - Signal invalid	Right-hand front height sensor signal invalid Incorrect height calibration process	Calibrate the system using the approved diagnostic system.
C1A04-78	Right Front Height Sensor - Alignment or adjustment incorrect	Sensor alignment or adjustment incorrect; signal out of range Height sensor linkage not connected Height sensor linkage toggled Height sensor loose Height sensor bracket bent Incorrect height calibration Wiring to height sensor short to ground Wiring to height sensor short to other cable Height sensor electrical fault	Check height sensor linkage is connected and not damaged. Visually inspect the height sensor for security, damage and correct orientation/installation. Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Repair/renew as necessary. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Calibrate the system using the approved diagnostic system.
C1A04-92	Right Front Height Sensor - Performance or incorrect operation	Right-hand front height sensor height changing slower than expected Axle valve block pipes incorrectly installed (unions reversed) Height sensor incorrectly installed A gallery pipe is blocked/damaged/crushed An air spring pipe is blocked/damaged/crushed Corner valve stuck closed Reservoir valve stuck open (mechanically)	NOTE: If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Check that the vehicle is free of obstructions. Check the height sensor for correct installation and torque of fixings. If necessary, calibrate the system using the approved diagnostic system. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check for an air spring leak. Check the air harness for evidence of melting, crushing, kinking or collapsing. Check the front and rear valve block pipes for correct routing and installation. Check the reservoir valve block pipes for correct routing and installation. Refer to the approved diagnostic system for corner, reservoir and exhaust valve checks. Check the corner valve for leaks.
C1A05-1C	Left Rear Height Sensor - Circuit voltage out of range	Right-hand front height sensor signal voltage out of range Height sensor disconnected Height sensor harness wiring short circuit to ground, short circuit to power or high resistance Height sensor fault	Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Check sensor signal changes when sensor is rotated. If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Calibrate the system using the approved diagnostic system.
C1A05-26	Left Rear Height Sensor - Signal rate of change below threshold	Left-hand rear height sensor signal voltage stuck while vehicle is driven Height sensor linkage disconnected Height sensor fault Height sensor harness wiring short circuit to ground, short circuit to power or high resistance	Check height sensor linkage is connected and not damaged. Visually inspect the wiring harness and connectors for water ingress. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A05-27	Left Rear Height Sensor - Signal rate of change above threshold	Left-hand rear height sensor signal rate of change above threshold Height sensor harness wiring short circuit to ground, short circuit to power or high resistance Height sensor linkage disconnected Height sensor failure	Check height sensor linkage is connected and not damaged. Visually inspect the wiring harness and connectors for water ingress. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A05-29	Left Rear Height Sensor - Signal invalid	Left-hand rear height sensor signal invalid Incorrect height calibration process	Calibrate the system using the approved diagnostic system.
C1A05-78	Left Rear Height Sensor - Alignment or adjustment incorrect	Sensor alignment or adjustment incorrect; signal out of range Height sensor linkage not connected Height sensor linkage toggled Height sensor loose Height sensor bracket bent Incorrect height calibration Wiring to height sensor short to ground Wiring to height sensor short to other cable Height sensor electrical fault	Check height sensor linkage is connected and not damaged. Visually inspect the height sensor for security, damage and correct orientation/installation. Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Repair/renew as necessary. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Calibrate the system using the approved diagnostic system.
C1A05-92	Left Rear Height Sensor - Performance or incorrect operation	Left-hand rear height sensor height changing slower than expected Axle valve block pipes connected incorrectly Height sensor incorrectly installed A gallery pipe is blocked/damaged/crushed An air spring pipe is blocked/damaged/crushed Corner valve stuck closed (mechanically) Reservoir valve stuck open (mechanically)	NOTE: If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Check that the vehicle is free of obstructions. Check the height sensor for correct installation and torque of fixings. If necessary, calibrate the system using the approved diagnostic system. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check for an air spring leak. Check the air harness for evidence of melting, crushing, kinking or collapsing. Check the front and rear valve block pipes for correct routing and installation. Check the reservoir valve block pipes for correct routing and installation. Refer to the approved diagnostic system for corner, reservoir and exhaust valve checks. Check the corner valve for leaks.
C1A06-1C	Right Rear Height Sensor - Circuit voltage out of range	Right-hand front height sensor signal voltage out of range Height sensor disconnected Height sensor harness wiring short circuit to ground, short circuit to power or high resistance Height sensor fault	Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Check sensor signal changes when sensor is rotated. If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Calibrate the system using the approved diagnostic system.
C1A06-26	Right Rear Height Sensor - Signal rate of change below threshold	Right-hand rear height sensor signal voltage stuck while vehicle is driven Height sensor linkage disconnected Height sensor fault Height sensor harness wiring short circuit to ground, short circuit to power or high resistance	Check height sensor linkage is connected and not damaged. Visually inspect the wiring harness and connectors for water ingress. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A06-27	Right Rear Height Sensor - Signal rate of change above threshold	Right- hand rear height sensor signal rate of change above threshold Height sensor harness wiring short circuit to ground, short circuit to power or high resistance Height sensor linkage disconnected Height sensor fault	Check height sensor linkage is connected and not damaged. Visually inspect the wiring harness and connectors for water ingress. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A06-29	Right Rear Height Sensor - Signal invalid	Right-hand rear height sensor signal invalid Incorrect height calibration process	Calibrate the system using the approved diagnostic system.
C1A06-78	Right Rear Height Sensor - Alignment or adjustment incorrect	Sensor alignment or adjustment incorrect; signal out of range Height sensor linkage not connected Height sensor linkage toggled Height sensor loose Height sensor bracket bent Incorrect height calibration Wiring to height sensor short to ground Wiring to height sensor short to other cable Height sensor electrical fault	Check height sensor linkage is connected and not damaged. Visually inspect the height sensor for security, damage and correct orientation/installation. Check the sensor connector for damage. Refer to the electrical circuit diagrams and check the sensor circuit for continuity or short circuit. Repair/renew as necessary. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Calibrate the system using the approved diagnostic system.
C1A06-92	Right Rear Height Sensor - Performance or incorrect operation	Right-hand rear height sensor height changing slower than expected Axle valve block pipes incorrectly installed (unions reversed) Height sensor incorrectly installed A gallery pipe is blocked/damaged/crushed An air spring pipe is blocked/damaged/crushed Corner valve stuck shut (mechanically) Reservoir valve stuck open (mechanically)	NOTE: If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Check that the vehicle is free of obstructions. Check the height sensor for correct installation and torque of fixings. If necessary, calibrate the system using the approved diagnostic system. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check for an air spring leak. Check the air harness for evidence of melting, crushing, kinking or collapsing. Check the front and rear valve block pipes for correct routing and installation. Check the reservoir valve block pipes for correct routing and installation. Refer to the approved diagnostic system for corner, reservoir and exhaust valve checks. Check the corner valve for leaks.
C1A07-62	Cross Articulation - Signal compare failure	NOTE: This DTC may be set by a fault relating to any of the height sensors. It will only set if fault is present and vehicle speed is greater than 55kph (35mph) for more than 25 seconds. Incorrect height calibration, e.g. height sensor removed and re-installed or renewed without re-calibrating Height sensor linkage damaged/bent (after calibration) Height sensor linkage loose/disconnected Height sensor bracket damaged/bent Height sensor harness wiring short circuit to ground, short circuit to power or high resistance Height sensor fault	Follow the process detailed in the relevant special service message (SSM). Check the condition and security of the height sensor bracket(s). Check the height sensor for correct installation and fixings torque. If any height sensor fixings are slackened or found to be loose, or a height sensor has been changed, the vehicle ride height must be re-calibrated. Calibrate the system using the approved diagnostic system.
C1A08-1C	Pressure Sensor Supply - Circuit voltage out of range	Pressure sensor supply voltage out of range Pressure sensor harness wiring short circuit to ground, short circuit to power or high resistance Pressure sensor failure Wiring to pressure sensor short to other cable	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check the pressure sensor circuit. Renew the sensor if faulty.
C1A10-64	Pressure Fluctuates When System Inactive - Signal plausibility failure	Signal plausibility failure Axle valve block pipes connected incorrectly Pneumatic parts disconnected while system active Corner valve stuck open (mechanically) Pressure sensor harness wiring short circuit to ground, short circuit to power or high resistance Pressure sensor fault (calibration drift) Pressure gallery leak Exhaust valve fault	Check the air spring pipes from the front and rear valve blocks are connected to the correct ports. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check for leaks. Refer to the electrical circuit diagrams and check the pressure sensor circuit. Renew the sensor if faulty.
C1A11-64	Pressure Increases When System Inactive - Signal plausibility failure	Signal plausibility failure Axle valve block pipes connected incorrectly Corner valve internal leak Reservoir valve internal leak Pressure sensor harness wiring short circuit to ground, short circuit to power or high resistance Pressure sensor fault Exhaust valve fault	Check the reservoir and air spring pipes from the front and rear valve blocks are connected to the correct ports. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check the pressure sensor circuit. Renew the sensor if faulty.
C1A13-64	Pressure Does Not Decrease When Venting Gallery - Signal plausibility failure	Signal plausibility failure Reservoir valve block pipes incorrectly installed (unions reversed) Exhaust valve stuck closed Exhaust valve does not hold minimum retention pressure Exhaust valve coil/wiring short circuit Gallery pipe blocked/damaged Air suspension exhaust silencer blocked/restricted Axle valve block pipes connected incorrectly Pressure sensor fault	Check the pipes from the reservoir valve block are connected to the correct ports. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check the pressure sensor circuit. Renew the sensor if faulty.
C1A18-64	Pressure Increase Too Rapid When Filling Reservoir - Signal plausibility failure	Signal plausibility failure Reservoir valve stuck closed (mechanically) Reservoir pipe blocked/damaged Reservoir port blocked/restricted Pressure sensor fault	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Renew the sensor if faulty.
C1A20-64	Pressure Increase Too Slow When Filling Reservoir - Signal plausibility failure	Signal plausibility failure Gallery pipe air leak Compressor fault Reservoir pipe air leak Reservoir air leak Intake filter blocked/restricted Intake pipe blocked/restricted Air suspension intake silencer blocked/restricted Corner valve stuck open	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check the Air suspension intake pipe and silencer for blockage/restriction.
C1A24-64	No Temperature Increase When Compressor Requested - Signal plausibility failure	Signal plausibility failure Air compressor cylinder head temperature sensor disconnected Air compressor cylinder head temperature sensor detached from cylinder head Air compressor cylinder head temperature sensor fault	Check the security of the compressor cylinder head temperature sensor and electrical connection. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A24-67	No Temperature Increase When Compressor Requested - Signal incorrect after event	Signal plausibility failure Air compressor cylinder head temperature sensor disconnected Air compressor cylinder head temperature sensor fault Air compressor disconnected Air compressor ground circuit high resistance Air compressor fault	Check the security of the compressor cylinder head temperature sensor and electrical connection. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
C1A27-12	Compressor Circuit - Circuit short to battery	Compressor voltage present when compressor not requested Air compressor harness wiring short circuit to power Compressor voltage present when compressor not requested Air compressor relay fault Compressor motor connector disconnected Compressor ground terminal loose	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check the compressor power supply circuit. Check the security and integrity of the compressor ground connection. Check the operation of the compressor relay. Repair/renew as necessary.
C1A27-14	Compressor Circuit - Circuit short to ground or open	Compressor circuit short to ground or open circuit Air suspension control module supply (COMP_V) fuse in battery junction box failed Air supply relay/air compressor supply fusible link in battery junction box failed/not installed Air compressor relay failure	Check/renew fuses as necessary. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check the operation of the compressor relay. Repair/renew as necessary.
C1A27-29	Compressor Circuit - Signal invalid	Compressor relay control voltage signal invalid	Refer to DTC C1A2712 which will be set first.
C1A28-64	Wrong Number of LEDs Illuminated - Signal plausibility failure	Switch pack disconnected Air suspension control module supply (BATTERY) fuse in battery junction box failed LED circuit short circuit to power One or more LEDs short circuit to each other Switch pack failure Switch pack harness wiring short circuit to ground, short circuit to power or high resistance	Check/renew fuse as necessary. Refer to the electrical circuit diagrams and check LED_NEG, HIGH_LED, ST_HT_LED, CRAWL_LED, ACCESS_HT_LED, RAISING_LED and LOWERING_LED circuits for short to ground, power or open circuit. Repair as necessary. Check for high resistance between air suspension control module and center console switch pack. Check for one or more LEDs short circuit to each other. Clear the DTC and test for normal operation. If no fault was found with the above circuit tests and the DTC is persists, suspect center console switch pack.
C1A29-92	Switch Activation Too Long - Performance or incorrect operation	Ride height change switch performance or incorrect operation Switch pressed for more than 255 seconds Switch pack harness wiring short circuit to ground, short circuit to power or high resistance Switch pack failure	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check LOWER_SW and RAISE_SW circuits for short to ground, power, or between harness. Check for High resistance between air suspension control module and center console switch pack. Check switch pack for mechanical damage, stuck contacts. Clear the DTC and test for normal operation. If no fault was found with the above circuit tests and the DTC is persists, suspect center console switch pack.
C1A30-64	Both Switches Pressed At Same Time - Signal plausibility failure	Signal plausibility failure Air suspension control module supply (BATTERY) fuse in battery junction box failed Switch pack harness wiring short circuit to ground Switch pack failure	Check/renew fuse as necessary. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check LOWER_SW and RAISE_SW circuits for short to ground, power, or between harness. Check for High resistance between air suspension control module and center console switch pack. Check switch pack for mechanical damage, stuck contacts. Clear the DTC and test for normal operation. If no fault was found with the above circuit tests and the DTC is persists, suspect center console switch pack.
C1A31-01	Left Front Corner Valve - General electrical failure	Left-hand front corner valve general electrical failure Front valve block disconnected Front valve block circuit short circuit to ground, open circuit or high resistance Left-hand front corner valve failure	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check valve circuit. Renew the valve block assembly if faulty. Clear the DTC and retest.
C1A32-01	Right Front Corner Valve - General electrical failure	Right-hand front corner valve general electrical failure Front valve block disconnected Front valve block circuit short circuit to ground, open circuit or high resistance Right-hand front corner valve failure	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check valve circuit. Renew the valve block assembly. Clear the DTC and retest.
C1A33-01	Left Rear Corner Valve - General electrical failure	Left-hand rear corner valve, general electrical failure Rear valve block disconnected Rear valve block circuit short circuit to ground, open circuit or high resistance Left-hand rear corner valve failure	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check valve circuit. Renew the valve block assembly if faulty. Clear the DTC and retest.
C1A34-01	Right Rear Corner Valve - General electrical failure	Right-hand rear corner valve general electrical failure Rear valve block circuit short circuit to ground, open circuit or high resistance Rear valve block disconnected Right-hand rear corner valve failure	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check valve circuit. Renew the valve block assembly if faulty. Clear the DTC and retest.
C1A35-01	Reservoir Valve - General electrical failure	Reservoir valve general electrical failure Reservoir valve block harness wiring short circuit to ground or open circuit Reservoir valve block disconnected Reservoir valve block failure	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check valve circuit. Renew the valve block assembly if faulty. Clear the DTC and retest.
C1A36-01	Exhaust Valve - General electrical failure	Exhaust valve general electrical failure Exhaust valve harness wiring short circuit to ground or open circuit Exhaust valve disconnected Exhaust valve failure	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check valve circuit. If exhaust valve is faulty, renew the compressor. Clear the DTC and retest.
C1A37-01	Front Cross-Link Valve - General electrical failure	Front cross-link valve general electrical failure Front valve block harness wiring short circuit to ground or open circuit Front valve block disconnected Front cross-link valve failure	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check valve circuit. Renew the valve block assembly if faulty. Clear the DTC and retest.
C1A38-01	Rear Cross-Link Valve - General electrical failure	Rear cross-link valve general electrical failure Rear valve block harness wiring short circuit to ground or open circuit Rear valve block disconnected Rear cross-link valve failure	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Refer to the electrical circuit diagrams and check valve circuit. Renew the valve block assembly if faulty. Clear the DTC and retest.
C1A68-1C	Left Front Height Sensor Supply - Circuit voltage out of range	Left-hand front height sensor supply circuit voltage out of range Height sensor harness wiring short circuit to ground or power Height sensor failure	NOTE: If a height sensor is changed, the vehicle ride height must be re-calibrated. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check the height sensor connector for damage and security. Refer to the electrical circuit diagrams and check height sensor circuit. Renew the sensor if faulty. Clear the DTC and retest.
C1A69-1C	Right Front Height Sensor Supply - Circuit voltage out of range	Right-hand front height sensor supply circuit voltage out of range Height sensor harness wiring short circuit to ground or power Height sensor failure	NOTE: If a height sensor is changed, the vehicle ride height must be re-calibrated. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check the height sensor connector for damage and security. Refer to the electrical circuit diagrams and check height sensor circuit. Renew the sensor if faulty. Clear the DTC and retest.
C1A70-1C	Left Rear Height Sensor Supply - Circuit voltage out of range	Left-hand rear height sensor supply circuit voltage out of range Height sensor harness wiring short circuit to ground, short circuit to power or high resistance Height sensor failure	NOTE: If a height sensor is changed, the vehicle ride height must be re-calibrated. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check the height sensor connector for damage and security. Refer to the electrical circuit diagrams and check height sensor circuit. Renew the sensor if faulty. Clear the DTC and retest.
C1A71-1C	Right Rear Height Sensor Supply - Circuit voltage out of range	Right-hand rear height sensor supply circuit voltage out of range Height sensor harness wiring short circuit to ground or power Height sensor failure	NOTE: If a height sensor is changed, the vehicle ride height must be re-calibrated. Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check the height sensor connector for damage and security. Refer to the electrical circuit diagrams and check height sensor circuit. Renew the sensor if faulty. Clear the DTC and retest.
C1A99-1C	Pressure Sensor - Circuit voltage out of range	Pressure sensor circuit voltage out of range Sensor disconnected Pressure sensor circuit short circuit to ground or to each other Pressure sensor fault	Where available, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check the sensor connector for damage and security. Refer to the electrical circuit diagrams and check height sensor circuit. Renew the sensor if faulty. Clear the DTC and retest.
C1B18-62	Supply Voltage X-Ref Check - Signal compare failure	Signal compare failure Inconsistent battery and ignition voltages received by air suspension control module Air suspension control module supply circuit(s) short circuit to ground Air suspension control module supply circuit(s) high resistance	Where available, refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical circuit diagrams and check the power supply circuits to the module. Check the module connector for security and integrity.
C1B21-1C	Compressor Brush Card Temperature Sensor Circuit - Circuit voltage out of range	Compressor brush card temperature sensor circuit voltage out of range Compressor brush card temperature sensor harness wiring short circuit to ground, short circuit to power or high resistance Compressor brush card temperature sensor failure	Where available, refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical circuit diagrams and check the compressor temperature circuit between the compressor and the module. Renew the compressor if temperature sensor faulty.
U0073-88	Control Module Communication Bus 'A' Off - Bus off	CAN Bus connections short circuit to each other	Refer to the electrical circuit diagrams and check the power and ground connections to the ride levelling module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network.
U0100-00	Lost Communication With ECM/PCM "A" - No sub type information	CAN Bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the engine control module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the engine control module and the ride levelling module.
U0101-00	Lost Communication With Transmission Control Module - No sub type information	CAN Bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the transmission control module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the transmission control module and the ride levelling module.
U0102-00	Lost Communication With Transfer Case Control Module - No sub type information	CAN Bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the transfer case control module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the transfer case control module and the ride levelling module.
U0122-00	Lost Communication With Vehicle Dynamics Control Module - No sub type information	CAN Bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the vehicle dynamics control module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the vehicle dynamics control module and the ride levelling module.
U0126-00	Lost Communication With Steering Angle Sensor Module - No sub type information	CAN Bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the steering angle sensor module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the steering angle sensor module and the ride leveling module.
U0128-00	Lost Communication With Park Brake Module - No sub type information	CAN Bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the park brake module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the park brake module and the ride levelling module
U0133-00	Lost Communication With Active Roll Control Module - No sub type information	CAN Bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the active roll control module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the active roll control module and the ride levelling module.
U0136-00	Lost Communication With Differential Control Module - Rear - No sub type information	CAN Bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the differential control module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the differential control module and the ride levelling module.
U0138-00	Lost Communication with All Terrain Control Module - No sub type information	CAN bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the all terrain control module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the all terrain control module and the ride levelling module.
U0140-00	Lost Communication With Body Control Module - No sub type information	CAN bus fault	Refer to the electrical circuit diagrams and check the power and ground connections to the body control module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network between the generic electronic module and the ride levelling module.
U0300-55	Internal Control Module Software Incompatibility - Not configured	Incorrect software loaded CAN wiring to generic electronic module high resistance Incorrect instrument cluster CAN configuration	Configure the Air suspension control module and instrument cluster as necessary using the approved diagnostic system.
U0416-68	Invalid Data Received From Vehicle Dynamics Control Module - Event information	Invalid data received from vehicle dynamics control module	Check the vehicle dynamics control module for related DTCs and refer to the relevant DTC index.
U0417-68	Invalid Data Received From Park Brake Control Module - Event information	Invalid data received from park brake control module	Check the park brake control module for related DTCs and refer to the relevant DTC index.
U0428-68	Invalid Data Received From Steering Angle Sensor Module (SASM) - Event information	Invalid data received from steering angle sensor module	Check the steering angle sensor module for related DTCs and refer to the relevant DTC index.
U1A14-49	CAN Initialization Failure - Internal electronic failure	Internal electronic failure	Refer to the electrical circuit diagrams and check the power and ground connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network.
U2000-67	Motor Temperature - Signal incorrect after event	Motor signal incorrect after event Compressor brush card temperature sensor not connected electrically Compressor brush card temperature sensor failure Compressor disconnected Compressor ground connection disconnected	Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system. Check the compressor connector for security and integrity. Check the compressor ground connection. Renew the compressor if temperature sensor faulty.
U2007-11	Valve(s) - Circuit short to ground	Valve circuit short circuit to ground when system is inactive Water ingress to wiring harness or connectors Valve harness wiring short circuit to ground or high resistance	Visually inspect the wiring harness and connectors between the air suspension control module and the control valves for water ingress. Refer to the electrical circuit diagrams and check the valve circuits.
U2007-67	Valve(s) - Signal incorrect after event	Valve signal incorrect after event Valve positive connections shorted to power or ground Electrical leakage between permanent battery volts and any valve positive connection	Visually inspect the wiring harness and connectors between the air suspension control module and the control valves for water ingress. Where possible, refer to the guided diagnostic routine for this DTC on the approved diagnostic system.
U210A-16	Temperature Sensor - Circuit voltage below threshold	Compressor cylinder head temperature sensor circuit voltage below threshold Temperature sensor circuit short to ground or short to other cable	Refer to the electrical circuit diagrams and check the compressor temperature circuit between the compressor and the control module. Renew the compressor assembly.
U3000-05	Control Module - System Programming Failures	System programming failures	This DTC is not a fault but is logged when the air suspension has been set in tight tolerance mode. Use the manufacturers approved diagnostic equipment to set system into normal (customer) mode.
U3000-1C	Control Module - Circuit voltage out of range	Circuit voltage out of range Vehicle battery voltage has been too low to operate the air suspension system Valve positive circuit intermittent short to ground	This may not be a fault. Check the battery state of charge and check for other DTCs that would determine a discharged battery condition. Clear the DTC and retest. If the DTC persists, visually inspect the wiring harness and connectors between the air suspension control module and the control valves for water ingress. Refer to the electrical circuit diagrams and check the valve circuits.
U3000-1D	Control Module - Circuit current out of range	Circuit current out of range Rear valve block disconnected Any valve positive short circuit to ground (more than 20A flowing)	Check the rear valve block connector for security and integrity (rear axle valve block is used as part of power-up diagnostic check). Refer to the electrical circuit diagrams and check the valve circuits.
U3000-49	Control Module - Internal electronic failure	Internal electronic failure	Renew the ride levelling control module. Refer to the warranty policy and Procedures information if a module is suspect.
U3000-52	Control Module - Not activated	Not activated	This DTC is not a fault, the control module has been set into manufacturing mode using diagnostic tester. Use the manufacturers approved diagnostic equipment to set system into normal (customer) mode.
U3000-53	Control Module - De-activated	Deactivated	This DTC is not a fault, the system has been deflated using the diagnostic deflation routine. Clear deflation routine using manufacturers approved diagnostic equipment.
U3000-55	Control Module - Not configured	Missing calibration	This DTC is not a fault, the system (height sensors) have not been calibrated. Using manufacturers approved diagnostic equipment, calibrate the ride height.
U3002-62	Vehicle Identification Number - Signal compare failure	Signal compare failure Ride levelling module has been swapped from another vehicle (NOTE Air suspension requires re-calibration) Instrument pack has been changed and not re-coded	Program the relevant module using the approved diagnostic system and calibrate the ride height.
U300D-01	Ignition Input On/Start - General electrical failure	General electrical failure Ignition fuse failed/missing No wake-up signal to ECU	Refer to the electrical circuit diagrams and check the power supply fuse and circuit to the module.