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Differential Control Module (RDCM)

NOTE: If a control module or component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval program is in operation, before the replacement of a component.
NOTE: Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).
NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal places, and with an up-to-date calibration certificate. When testing resistance always take the resistance of the DMM leads into account.
NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
NOTE: Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.
NOTE: If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.

Description And Operation 

For a detailed description of the rear differential system, refer to the relevant Description and Operation . Refer to Driveline System .

DTC Description Possible Cause Action
P0560-17 System Voltage - Circuit voltage above threshold
  • Boost starting or battery charging
  • Power or ground supply circuit fault
  • Battery or charging system fault
NOTE: This DTC may be logged due to boost starting or battery charging
  • Check other modules for related DTC's
  • Clear the DTCs and retest
  • Check vehicle battery and charging system and repair as required
  • Refer to the electrical circuit diagrams and check the power and ground supply circuits to the rear differential control module
  • Clear the DTC's and retest
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P0602-54 Powertrain Control Module Programming Error - Missing calibration
  • Rear differential control module programming error
  • Rear differential control module internal failure
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the rear differential control module
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P0607-49 Control Module Performance - Internal electronic failure
  • Rear differential control module programming error
  • Rear differential control module internal failure
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the rear differential control module
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P0634-68 Control Module Internal Temperature "A" Too High - Event information
  • Rear differential control module internal temperature high due to high ambient temperatures or excessive continued use
  • Low oil level
  • If the vehicle temperature is excessive, with the vehicle ignition switched off allow sufficient time for the vehicle to cool. Consider the surrounding ambient temperature
  • Clear the DTC and re-test
  • Carry out visual check of the rear differential coupling for oil leaks repair as required
  • Carry out oil level check procedure Refer to Active On-Demand Coupling Filling .
  • Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P0666-11 Control Module Internal Temperature Sensor "A" Circuit - Circuit short to ground
  • Differential Electronic Module (DEM) internal temperature sensor failure
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P0666-15 Control Module Internal Temperature Sensor "A" Circuit - Circuit short to battery or open
  • Differential Electronic Module (DEM) internal temperature sensor failure
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P0667-27 Control Module Internal Temperature Sensor "A" Range/Performance - Signal rate of change above threshold
  • Rear differential control module internal temperature sensor failure
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P0748-12 Pressure Control Solenoid A Electrical - Circuit short to battery
  • Valve internal failure
NOTE: The valve is calibrated to the module and must be installed as a kit
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P0748-1D Pressure Control Solenoid A Electrical - Circuit current out of range
  • Pressure control solenoid circuit short circuit to ground, short circuit to power, high resistance
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P0961-62 Pressure Control Solenoid A Control Circuit Range/Performance - Signal compare failure
  • Power or ground supply fault
  • Differential Electronic Module (DEM) internal failure
  • Differential coupling assembly failure
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the rear differential control module
  • Clear the DTC
  • Carry out road test
  • Check for stored DTCs
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module . Refer to the Warranty Policy and Procedures manual, or determine if any prior approval program is in operation, prior to the installation of a new module/component
  • Clear the DTC and re-test
  • Carry out road test
  • If the DTC returns, Check and install a new (GEN 4) Differential as required.
P1635-68 Tire/Axle Out of Acceptable Range - Event information
  • Wheel or tire size mismatch between the front wheels and rear wheels
  • Excessive wheel slip or vehicle has been on a rolling road
  • Under inflated tire
  • Carry out visual inspection of the front and rear tires confirm the correct sizes have been installed
  • Clear the DTC and re-test
  • If the DTC returns, Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
P1889-12 Oil Pressure Pump Performance - Circuit short to battery
  • Oil pressure feeder pump circuit short to power
  • Oil pressure feeder pump internal failure
  • Rear differential control module internal failure
  • Carry out visual check of the cable and connector between oil pump and the Differential Electronic Module (DEM)
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new pump as required. Refer to Active On-Demand Coupling Oil Pump .
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P1889-14 Oil Pressure Pump Performance - Circuit short to ground or open
  • Power or ground supply fault
  • Oil pressure feeder pump circuit short to ground, open circuit
  • Circuit fault
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
  • Carry out visual check of the cable and connector between oil pump and the Differential Electronic Module (DEM)
  • Clear the DTC and re-test
  • If the DTC returns, Refer to Active On-Demand Coupling Oil Pump . Check and install a new pump as required. R
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P1889-18 Oil Pressure Pump Performance - Circuit current below threshold
  • Low oil level (Due to external leak)
  • Oil pressure feeder pump internal failure
  • Carry out visual check of the cable and connector between oil pump and the Differential Electronic Module (DEM)
  • Clear the DTC and re-test
  • If the DTC returns, Carry out oil level check procedure Refer to Active On-Demand Coupling Filling .
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new pump as required. Refer to Active On-Demand Coupling Oil Pump .
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P1889-19 Oil Pressure Pump Performance - Circuit current above threshold
  • Oil pressure pump internal failure
  • Oil pump electrical circuit fault
  • Differential Electronic Module (DEM) internal failure
  • Carry out visual check of the cable and connector between oil pump and the Differential Electronic Module (DEM)
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new pump as required. Refer to Active On-Demand Coupling Oil Pump .
  • Clear the DTC and re-test
  • If the DTC returns, Carry out oil level check procedure Refer to Active On-Demand Coupling Filling .
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P1889-49 Oil Pressure Pump Performance - Internal electronic failure
  • Differential Electronic Module (DEM) internal failure
  • Clear the DTC and re-test
  • If the DTC returns, Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
P1889-7A Oil Pressure Pump Performance - Fluid leak or seal failure
  • Oil filter leaking
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
  • Clear the DTC and re-test
  • If the DTC returns. Replace the oil filter
  • Carry out oil level check procedure Refer to Active On-Demand Coupling Filling .
U0001-00 High Speed CAN Communication Bus - No sub type information
  • High speed CAN communication bus short to ground, short to power, open circuit
  • Clear the DTC and re-test
  • If the DTC returns. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN network for short to ground, short to power, open circuit
  • Clear the DTC and re-test
  • If the DTC returns. Check and install a new (GEN 4) Differential as required.
U0100-00 Lost Communication With ECM/PCM "A" - No sub type information
  • Lost communication with Engine Control Module (ECM)
  • Check the Engine Control Module for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. 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 Differential Electronic Module (DEM)
U0101-00 Lost Communication with TCM - No sub type information
  • Lost communication with Transmission Control Module (TCM)
  • Check the Transmission Control Module (TCM) for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. 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 (TCM) and Differential Electronic Module (DEM)
U0121-00 Lost Communication With Anti-Lock Brake System (ABS) Control Module - No sub type information
  • Lost communication with Anti-Lock Brake System (ABS) module
  • Check the Anti-Lock Brake System (ABS) module for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. 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 Anti-Lock Brake System (ABS) module and Differential Electronic Module (DEM)
U0138-00 Lost Communication with All Terrain Control Module - No sub type information
  • Lost communication with All Terrain Control Module (ATCM)
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
  • Check the All Terrain Control Module (ATCM) for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. 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 (ATCM) and Differential Electronic Module (DEM)
U0140-00 Lost Communication With Body Control Module - No sub type information
  • Lost communication with Central Junction Box (CJB)
  • Check the Central Junction Box (CJB) for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. 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 Central Junction Box (CJB) and Differential Electronic Module (DEM)
U0300-00 Internal Control Module Software Incompatibility - No sub type information
  • High speed CAN communication bus circuit problem
  • Invalid configuration message is received
  • Check the Central Junction Box (CJB) for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
U0300-46 Internal Control Module Software Incompatibility - Calibration / parameter memory failure
  • Differential Electronic Module (DEM) missing calibration, corrupt software
  • Differential Electronic Module (DEM) installed to vehicle internal failure
  • Clear the DTC and re-test
  • If the DTC returns
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
  • Clear the DTC and re-test
  • If the DTC returns. Check and install a new (GEN 4) Differential. Refer to Active On-Demand Coupling Module .
U0300-4A Internal Control Module Software Incompatibility - Incorrect component installed
  • Differential Electronic Module (DEM) missing calibration, corrupt software
  • Incorrect Differential Electronic Module (DEM) installed to vehicle
  • Clear the DTC and re-test
  • If the DTC returns. Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
  • Clear the DTC and re-test
  • If the DTC returns. Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
U0300-54 Internal Control Module Software Incompatibility - Missing calibration
  • Differential Electronic Module (DEM) missing calibration, corrupt software
  • Clear the DTC and re-test
  • If the DTC returns. Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
  • Clear the DTC and re-test
  • If the DTC returns. Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
U0401-68 Invalid Data Received From ECM/PCM - Event information
  • Invalid data received from the Engine Control Module (ECM)
  • Check the Engine Control Module (ECM) for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
U0415-68 Invalid Data Received From Anti-Lock Brake System (ABS) Control Module - Event information
  • Invalid data received from Anti-Lock Braking System (ABS) module
  • Check the Anti-Lock Braking System (ABS) module for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
U2100-00 Initial Configuration Not Complete - No sub type information
  • Differential Electronic Module (DEM) missing calibration, corrupt software
  • Car Configuration File (CCF) data parameter incorrect
  • Check the Central Junction Box (CJB) for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. Check / amend the car config as required
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
U2101-00 Control Module Configuration Incompatible - No sub type information
  • Car Configuration File (CCF) data parameter incorrect
  • Check the Central Junction Box (CJB) for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. Check / amend the car config as required
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
U3002-81 Vehicle Identification Number - Invalid serial data received
  • Incorrect Differential Electronic Module (DEM) installed to vehicle
  • Check the Central Junction Box (CJB) for related DTCs
  • Clear the DTC and re-test
  • If the DTC returns. Check / amend the car config as required
  • Using the manufacturer approved diagnostic system check and install latest relevant level of software to the Differential Electronic Module (DEM)
U3003-62 Battery Voltage - Signal compare failure
  • Miss-match in battery voltage, between the Central Junction Box (CJB) and Differential Electronic Module (DEM), of 2 volts or more
  • Clear the DTC and re-test
  • If the DTC returns. Refer to the electrical circuit diagrams and check the power and ground circuits to the Differential Electronic Module (DEM). Refer to the electrical circuit diagrams and check the power and ground circuits to the Central Junction Box (CJB)
  • Clear the DTC and re-test
  • If the DTC returns. Check and install a new (GEN 4) Differential Electronic Module (DEM) kit as required. Refer to Active On-Demand Coupling Module .
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