DTC Index

NOTE: If the control module/transmission 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, prior to the installation of a new module/transmission.

NOTE: Generic scan tools may not read the codes listed, or may read only five digit codes. Match the five digits from the scan tool to the first five digits of the seven digit code listed to identify the fault (the last two digits give additional information read by the manufacturer approved diagnostic system).

NOTE: When performing electrical 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.

DTC	Description	Possible Cause	Action
C1A00-46	Control Module - calibration / parameter memory failure	Corruption in the non-volatile memory storage system (EEPROM) in the Terrain Response Control Module The Terrain Response Control Module has indicated a calibration / parameter memory failure for embedded systems using FLASH memory. This is equivalent to EEPROM in RAM/ROM/EEPROM embedded systems Corruption in the non-volatile memory storage system (EEPROM) in the Terrain Response Control Module	Rectify this DTC before attempting to rectify others. Record all DTCs logged and clear them. With ignition on select a terrain response special program, turn off the ignition, then turn back on the ignition and verify the selected special program is still active. If the selected terrain response special program is not still active and has returned to the general program, confirm if DTC has returned. Repeat procedure again once more. If DTC is still present install a new terrain response rotary control and control module. Refer to the warranty policy and procedures manual if a module is suspect
C1A01-96	LED Circuit - component internal failure	Terrain response rotary control and control module - LED short circuit to ground Terrain response rotary control and control module - LED open circuit	NOTE: If the system is in 'fail-safe default mode due to another issue no LEDs will illuminate. This fault does not cause the system to go to 'fail-safe default' Refer to the Description and Operation section of workshop manual. Check terrain response system, special program LEDs. One or more of the LEDs is suspected of not illuminating as appropriate. With the engine running move the terrain response rotary control through all five programs and confirm the appropriate special program LED does not illuminate when the terrain response rotary control is in that position. Suspect the terrain response rotary control and control module, check and install a new terrain response rotary control and control module as required, refer to the new module/component installation note at the top of the DTC Index
C1A02-94	Rotary Encoder Stuck In Intermediate Position - unexpected operation	The terrain response rotary control is held in an intermediate position (between the special programs) for more than 60 seconds Foreign object preventing correct operation of terrain response rotary control Mechanical damage to the terrain response rotary control	NOTE: Suspect driver error do not replace the terrain response rotary control at this time Check for foreign object preventing correct operation of terrain response rotary control. Start the vehicle engine, rotate the terrain response rotary control until it has located a genuine detent, wait 60 seconds. Stop the vehicle engine, clear the DTC and retest
U0073-88	Control Module Communication Bus "A" Off - bus off	Bus off. The Terrain Response Control Module has detected the data bus is not available CAN bus open circuit CAN bus short circuit to ground CAN bus short circuit to power Failure of another control module on the CAN bus	Refer to electrical circuit diagrams, check CAN circuit for open circuit, short to ground, short to power, repair/renew as necessary. Using the manufacturer approved diagnostic system, carry out network integrity test. Check the system is operating correctly and the DTC does not return
U0100-87	Lost Communication With ECM/PCM "A" - missing message	The Terrain Response Control Module has not received one or more expected messages from the Engine Control Module High speed CAN circuit communications failure Open circuit Engine Control Module, powerfeed Open circuit Engine Control Module, ground supply Engine Control Module disconnected from the high speed CAN communication bus Open circuit Engine Control Module high speed CAN low circuit Open circuit Engine Control Module high speed CAN high circuit Engine Control Module not configured Engine Control Module failure	Using the manufacturer approved diagnostic system, check the Engine Control Module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Using the manufacturer approved diagnostic system, re-configure the Engine Control Module. Refer to electrical circuit diagrams, check power feed and ground supplies, to Engine Control Module for open circuit. Check for open circuit Engine Control Module high speed CAN low circuit. Check for open circuit Engine Control Module high speed CAN high circuit, repair as necessary
U0101-87	Lost Communication with TCM - missing message	The Terrain Response Control Module has not received one or more expected messages from the Transmission Control Module High speed CAN circuit communications failure Open circuit Transmission Control Module, powerfeed Open circuit Transmission Control Module, ground supply Transmission Control Module disconnected from the high speed CAN communication bus Open circuit Transmission Control Module high speed CAN low circuit Open circuit Transmission Control Module high speed CAN high circuit Transmission Control Module not configured Transmission Control Module failure	Using the manufacturer approved diagnostic system, check the Transmission Control Module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Using the manufacturer approved diagnostic system, re-configure the Transmission Control Module. Refer to electrical circuit diagrams, check power feed and ground supplies, to Transmission Control Module for open circuit. Check for open circuit Transmission Control Module high speed CAN low circuit. Check for open circuit Transmission Control Module high speed CAN high circuit, repair as necessary
U0102-87	Lost Communication with Transfer Case Control Module - missing message	The Terrain Response Control Module has not received one or more expected messages from the Transfer Case Control Module High speed CAN circuit communications failure Open circuit Transfer Case Control Module, powerfeed Open circuit Transfer Case Control Module, ground supply Transfer Case Control Module disconnected from the high speed CAN communication bus Open circuit Transfer Case Control Module high speed CAN low circuit Open circuit Transfer Case Control Module high speed CAN high circuit Transfer Case Control Module not configured Transfer Case Control Module failure	Using the manufacturer approved diagnostic system, check the Transfer Case Control Module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Using the manufacturer approved diagnostic system, re-configure the Transfer Case Control Module. Refer to electrical circuit diagrams, check power feed and ground supplies, to Transfer Case Control Module for open circuit. Check for open circuit Transfer Case Control Module high speed CAN low circuit. Check for open circuit Transfer Case Control Module high speed CAN high circuit, repair as necessary
U0122-87	Lost Communication With Vehicle Dynamics Control Module - missing message	The Terrain Response Control Module has not received one or more expected messages from the ABS Module High speed CAN circuit communications failure Open circuit ABS Module, powerfeed Open circuit ABS Module, ground supply ABS Module disconnected from the high speed CAN communication bus Open circuit ABS Module high speed CAN low circuit Open circuit ABS Module high speed CAN high circuit ABS Module not configured ABS Module failure	Using the manufacturer approved diagnostic system, check the ABS Module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Using the manufacturer approved diagnostic system, re-configure the ABS Module. Refer to electrical circuit diagrams, check power feed and ground supplies, to ABS Module for open circuit. Check for open circuit ABS Module high speed CAN low circuit. Check for open circuit ABS Module high speed CAN high circuit, repair as necessary
U0132-87	Lost Communication With Suspension Control Module "A" - missing message	The Terrain Response Control Module has not received one or more expected messages from the Air Suspension Control Module High speed CAN circuit communications failure Open circuit Air Suspension Control Module, powerfeed Open circuit Air Suspension Control Module, ground supply Air Suspension Control Module disconnected from the high speed CAN communication bus Open circuit Air Suspension Control Module high speed CAN low circuit Open circuit Air Suspension Control Module high speed CAN high circuit Air Suspension Control Module not configured Air Suspension Control Module failure	Using the manufacturer approved diagnostic system, check the Air Suspension Control Module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Using the manufacturer approved diagnostic system, re-configure the Air Suspension Control Module. Refer to electrical circuit diagrams, check power feed and ground supplies, to Air Suspension Control Module for open circuit. Check for open circuit Air Suspension Control Module high speed CAN low circuit. Check for open circuit Air Suspension Control Module high speed CAN high circuit, repair as necessary
U0155-87	Lost Communication With Instrument Panel Cluster (IPC) Control Module - missing message	The Terrain Response Control Module has not received one or more expected messages from the Instrument Panel Cluster (IPC) Control Module High speed CAN circuit communications failure Open circuit Instrument Panel Cluster (IPC) Control Module, powerfeed Open circuit Instrument Panel Cluster (IPC) Control Module, ground supply Instrument Panel Cluster (IPC) Control Module disconnected from the high speed CAN communication bus Open circuit Instrument Panel Cluster (IPC) Control Module high speed CAN low circuit Open circuit Instrument Panel Cluster (IPC) Control Module high speed CAN high circuit Instrument Panel Cluster (IPC) Control Module not configured Instrument Panel Cluster (IPC) Control Module failure	Using the manufacturer approved diagnostic system, check the Instrument Panel Cluster (IPC) Control Module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Using the manufacturer approved diagnostic system, re-configure the Instrument Panel Cluster (IPC) Control Module. Refer to electrical circuit diagrams, check power feed and ground supplies, to Instrument Panel Cluster (IPC) Control Module for open circuit. Check for open circuit Instrument Panel Cluster (IPC) Control Module high speed CAN low circuit. Check for open circuit Instrument Panel Cluster (IPC) Control Module high speed CAN high circuit, repair as necessary
U0300-55	Internal Control Module Software Incompatibility - not configured	The Terrain Response Control Module has failed to recognize a matching master configuration ID from the CAN data bus master Terrain Response Control Module has incorrect CAN configuration CAN bus master not correctly configured Message containing configuration ID not received due to CAN bus issue Message containing configuration ID not transmitted by CAN bus master	Using the manufacturer approved diagnostic system, check the CAN configuration in the Terrain Response Control Module, check correct software versions installed and update as necessary. If similar DTCs from other modules suspect CAN bus or CAN bus master ECU, check CAN bus operation, check the CAN configuration in the CAN bus master module, check correct software versions installed and update as necessary. Check the system is operating correctly and the DTC does not return
U0401-94	Invalid Data Received From ECM/PCM - unexpected operation	The Terrain Response Control Module has detected that the Engine Control Module component had operated in a way or at a time that it had not been commanded to operate The engine management system, Engine Control Module is unable to support normal terrain response functionality, the terrain response system will go into default condition Engine management system fault Engine Control Module failure	Using the manufacturer approved diagnostic system, check the Engine Control Module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return
U0402-94	Invalid Data Received From Transmission Control Module - unexpected operation	The Terrain Response Control Module has detected that the Transmission Control Module component had operated in a way or at a time that it had not been commanded to operate The transmission system, Transmission Control Module is unable to support normal terrain response functionality, the terrain response system will go into default condition Transmission system fault Transmission Control Module failure	Using the manufacturer approved diagnostic system, check the Transmission Control Module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return
U0403-94	Invalid Data Received From Transfer Case Control Module - unexpected operation	The Terrain Response Control Module has detected that the Transfer Case Control Module had operated in a way or at a time that it had not been commanded to operate The Transfer Case Control Module is unable to support normal terrain response functionality, the terrain response system will go into default condition Transfer Case Control system fault Transfer Case Control Module failure	Using the manufacturer approved diagnostic system, check the Transfer Case Control Module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return
U0416-94	Invalid Data Received From Vehicle Dynamics Control Module - unexpected operation	The Terrain Response Control Module has detected that the ABS Module had operated in a way or at a time that it had not been commanded to operate The ABS Module is unable to support normal terrain response functionality, the terrain response system will go into default condition Vehicle Dynamics System fault ABS Module failure	Using the manufacturer approved diagnostic system, check the ABS Module control module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return
U0421-94	Invalid Data Received from Suspension Control Module A - unexpected operation	The Terrain Response Control Module has detected that the Air Suspension Control Module had operated in a way or at a time that it had not been commanded to operate Air Suspension Control Module is unable to support normal terrain response functionality, the terrain response system will go into default condition Suspension Control System fault Air Suspension Control Module failure	Using the manufacturer approved diagnostic system, check the Air Suspension Control Module control module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return
U2012-4A	Car Configuration Parameter(s) - incorrect component installed	The Terrain Response Control Module has detected a mismatch between the hardware connected and the hardware expected Vehicle not correctly configured Incorrect components installed for vehicle configuration	Using the manufacturer approved diagnostic system, check the vehicle configuration file, rectify as necessary. Check correct components for vehicle configuration are installed, rectify as necessary. Check the system is operating correctly and the DTC does not return