DTC Index

NOTE: If the control module/transmission is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures information 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.

Description And Operation

For a detailed description of the Terrain Response system, refer to the relevant Description and Operation workshop information. Refer to RIDE AND HANDLING OPTIMIZATION .

TERRAIN RESPONSE CONTROL MODULE

DTC	Description	Possible Cause	Action
C1A00-46	Control Module - calibration / parameter memory failure	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 information 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 'failsafe default mode due to another issue no LEDs will illuminate. This fault does not cause the system to go to 'failsafe default'. Refer to the Description and Operation workshop information. 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, power feed 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, power feed 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
U0121-87	Lost Communication With Anti-Lock Brake System (ABS) Control Module - missing message	The Terrain Response Control Module has not received one or more expected messages from the Anti-Lock Brake System Control Module High speed CAN circuit communications failure Open circuit Anti-Lock Brake System Control Module, power feed Open circuit Anti-Lock Brake System Control Module, ground supply Anti-Lock Brake System Control Module disconnected from the high speed CAN communication bus Open circuit Anti-Lock Brake System Control Module high speed CAN low circuit Open circuit Anti-Lock Brake System Control Module high speed CAN high circuit Anti-Lock Brake System Control Module not configured Anti-Lock Brake System Control Module failure	Using the manufacturer approved diagnostic system, check the Anti-Lock Brake System 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 Anti-Lock Brake System Control Module. Refer to electrical circuit diagrams, check power feed and ground supplies, to Anti-Lock Brake System Control Module for open circuit. Check for open circuit Anti-Lock Brake System Control Module high speed CAN low circuit. Check for open circuit Anti-Lock Brake System Control Module high speed CAN high circuit, repair as necessary. Suspect the Anti-Lock Brake System Control Module, check and install a new Anti-Lock Brake System Control Module as required, refer to the new module/component installation note at the top of the DTC Index. Check the system is operating correctly and the DTC does not return.
U0136-87	Lost Communication With Differential Control Module - Rear - missing message	The Terrain Response Control Module has not received one or more expected messages from the Rear Differential Control Module High speed CAN circuit communications failure Open circuit Rear Differential Control Module, power feed Open circuit Rear Differential Control Module, ground supply Rear Differential Control Module disconnected from the high speed CAN communication bus Open circuit Rear Differential Control Module high speed CAN low circuit Open circuit Rear Differential Control Module high speed CAN high circuit Rear Differential Control Module not configured Rear Differential Control Module failure	Using the manufacturer approved diagnostic system, check the Rear Differential 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 Rear Differential Control Module. Refer to electrical circuit diagrams, check power feed and ground supplies, to Rear Differential Control Module for open circuit. Check for open circuit Rear Differential Control Module high speed CAN low circuit. Check for open circuit Rear Differential Control Module high speed CAN high circuit, repair as necessary. Suspect the Rear Differential Control Module, check and install a new Rear Differential Control Module as required, refer to the new module/component installation note at the top of the DTC Index. Check the system is operating correctly and the DTC does not return.
U0140-87	Lost Communication With Body Control Module - missing message	The Terrain Response Control Module has not received one or more expected messages from the Body Control Module High speed CAN circuit communications failure Open circuit Body Control Module, power feed Open circuit Body Control Module, ground supply Body Control Module disconnected from the high speed CAN communication bus Open circuit Body Control Module high speed CAN low circuit Open circuit Body Control Module high speed CAN high circuit Body Control Module not configured Body Control Module failure	Using the manufacturer approved diagnostic system, check the Body 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 Body Control Module. Refer to electrical circuit diagrams, check power feed and ground supplies, to Body Control Module for open circuit. Check for open circuit Body Control Module high speed CAN low circuit. Check for open circuit Body Control Module high speed CAN high circuit, repair as necessary. Suspect the Body Control Module, check and install a new Body Control Module as required, refer to the new module/component installation note at the top of the DTC Index. Check the system is operating correctly and the DTC does not return.
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
U0415-94	Invalid Data Received From Anti-Lock Brake System Control Module - unexpected operation	The Terrain Response Control Module has detected that the Anti-Lock Brake System control module component had operated in a way or at a time that it had not been commanded to operate The Anti-Lock Brake System, Anti-Lock Brake System control module is unable to support normal terrain response functionality, the terrain response system will go into default condition Anti-Lock Brake System fault Anti-Lock Brake System control module failure	Using the manufacturer approved diagnostic system, check the Anti-Lock Brake System 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. Suspect the Anti-Lock Brake System control module, check and install a new Anti-Lock Brake System control module as required, refer to the new module/component installation note at the top of the DTC Index.
U0437-94	Invalid Data Received From Differential Control Module-Rear - unexpected operation	The Terrain Response Control Module has detected that the Rear Differential Control Module component had operated in a way or at a time that it had not been commanded to operate The Rear Differential system, Rear Differential Control Module is unable to support normal terrain response functionality, the terrain response system will go into default condition Rear Differential system fault Rear Differential Control Module failure	Using the manufacturer approved diagnostic system, check the Rear Differential 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. Suspect the Rear Differential Module, check and install a new Rear Differential Module as required, refer to the new module/component installation note at the top of the DTC Index.
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.