Terrain Response Control Module (ATCM)

WARNING: This page is about a different car, the 2012 Land Rover Range Rover Sport and 2011 Land Rover Range Rover Sport. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.

NOTE: If the control module or a component 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/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: 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.

NOTE: There are references to "power latch" within the DTC index. This is where the module must be reset by means of a complete power down and power up.

The table below lists all Diagnostic Trouble Codes (DTCs) that could be logged in the All Terrain Control Module, for additional Diagnosis and Testing information refer to the relevant Diagnosis and Testing. Refer to RIDE AND HANDLING OPTIMIZATION .

DTC	Description	Possible Causes	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 still not 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 switch and control module. Refer to the warranty policy and procedures information if a module is suspect
C1A01-96	LED - Component internal failure	LED circuit short circuit to ground or 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 switch through all five programs and confirm the appropriate special program LED does not illuminate when the terrain response rotary control switch is in that position. Suspect the terrain response rotary control switch and control module, check and install a new terrain response rotary control switch and control module as required. Refer to the warranty policy and procedures information if a module is suspect
C1A02-94	Rotary Encoder Stuck In Intermediate Position - Unexpected operation	The terrain response rotary control switch 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 switch Mechanical damage to the terrain response rotary control switch	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
U0001-88	High Speed CAN Communication Bus Off - Bus off	Bus off. The Terrain response control module has detected the data bus is not available CAN bus short circuit to ground, power or open circuit Failure of another control module on the CAN bus	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
U0100-00	Lost Communication With The ECM/PCM 'A' - No sub type information	The Terrain response control module has not received one or more expected messages from the Engine Control Module Engine Control Module power circuit open circuit Engine Control Module ground circuit open circuit High speed CAN circuit communications failure Engine Control Module disconnected from the high speed CAN communication bus Engine Control Module disconnected from the high speed CAN communication bus Engine Control Module high speed CAN Low circuit open 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 the power and ground connections to Engine Control Module. Check the high speed CAN low and CAN high circuits, repair as necessary. Clear the DTC and retest. If the problem persists, suspect the Engine Control Module. Refer to the warranty policy and procedures information if a module is suspect. Check the system is operating correctly and the DTC does not return
U0101-00	Lost Communication With The TCM - No sub type information	The Terrain response control module has not received one or more expected messages from the Transmission Control Module High speed CAN circuit communications failure Transmission Control Module power circuit open circuit Transmission Control Module ground circuit open circuit Transmission Control Module disconnected from the high speed CAN communication bus Transmission Control Module disconnected from the high speed CAN communication bus Transmission Control Module high speed CAN Low circuit open 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 the power and ground connections to Transmission Control Module. Check the high speed CAN low and CAN high circuits, repair as necessary. Clear the DTC and retest. If the problem persists, suspect the Transmission Control Module. Refer to the warranty policy and procedures information if a module is suspect. Check the system is operating correctly and the DTC does not return
U0102-00	Lost Communication With The Transfer Case Control Module - No sub type information	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 Transfer Case Control Module power circuit open circuit Transfer Case Control Module ground circuit open circuit Transfer Case Control Module disconnected from the high speed CAN communication bus Transfer Case Control Module high speed CAN Low circuit open circuit Transfer Case Control Module high speed CAN High circuit open 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 the power and ground connections to Transfer Case Control Module. Check the high speed CAN low and CAN high circuits, repair as necessary. Clear the DTC and retest. If the problem persists, suspect the Transfer Case Control Module. Refer to the Warranty Policy and Procedures information if a module is suspect. Check the system is operating correctly and the DTC does not return
U0121-00	Lost Communication With Anti-Lock Brake System (ABS) Control Module - No sub type information	The Terrain response control module has not received one or more expected messages from the ABS Control Module High speed CAN circuit communications failure ABS Control Module power circuit open circuit ABS Control Module ground circuit open circuit ABS Control Module disconnected from the high speed CAN communication bus ABS Control Module high speed CAN Low circuit open circuit ABS Control Module high speed CAN High circuit open circuit ABS Control Module not configured ABS Control Module failure	Using the manufacturer approved diagnostic system, check the ABS 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 ABS Control Module. Refer to electrical circuit diagrams check the power and ground connections to ABS Control Module. Check the high speed CAN low and CAN high circuits, repair as necessary. Clear the DTC and retest. If the problem persists, suspect the ABS Control Module. Refer to the Warranty Policy and Procedures information if a module is suspect. Check the system is operating correctly and the DTC does not return
U0132-00	Lost Communication With Suspension Control Module 'A' - No sub type information	The Terrain response control module has not received one or more expected messages from the Suspension Control Module (Ride Level Module) High speed CAN circuit communications failure Suspension Control Module power circuit open circuit Suspension Control Module ground circuit open circuit Suspension Control Module disconnected from the high speed CAN communication bus Suspension Control Module high speed CAN Low circuit open circuit Suspension Control Module high speed CAN High circuit open circuit Suspension Control Module not configured Suspension Control Module failure	Using the manufacturer approved diagnostic system, check the 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 Suspension Control Module. Refer to electrical circuit diagrams check the power and ground connections to Suspension Control Module. Check the high speed CAN low and CAN high circuits, repair as necessary. Clear the DTC and retest. If the problem persists, suspect the Suspension Control Module. Refer to the Warranty Policy and Procedures information if a module is suspect. Check the system is operating correctly and the DTC does not return
U0139-00	Lost Communication With Suspension Control Module 'B' - No sub type information	The Terrain response control module has not received one or more expected messages from the Suspension Control Module (Continuously Variable Dampening) High speed CAN circuit communications failure Suspension Control Module power circuit open circuit Suspension Control Module ground circuit open circuit Suspension Control Module disconnected from the high speed CAN communication bus Suspension Control Module high speed CAN Low circuit open circuit Suspension Control Module high speed CAN High circuit open circuit Suspension Control Module not configured Suspension Control Module failure	Using the manufacturer approved diagnostic system, check the 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 Suspension Control Module. Refer to electrical circuit diagrams check the power and ground connections to Suspension Control Module. Check the high speed CAN low and CAN high circuits, repair as necessary. Clear the DTC and retest. If the problem persists, suspect the Suspension Control Module. Refer to the Warranty Policy and Procedures information if a module is suspect. Check the system is operating correctly and the DTC does not return
U0140-00	Lost Communication With Body Control Module - No sub type information	The Terrain response control module has not received one or more expected messages from the Generic Electronic Module High speed CAN circuit communications failure Generic Electronic Module power circuit open circuit Generic Electronic Module ground circuit open circuit Generic Electronic Module disconnected from the high speed CAN communication bus Generic Electronic Module high speed CAN Low circuit open circuit Generic Electronic Module high speed CAN High circuit open circuit Generic Electronic Module not configured Generic Electronic Module failure	Using the manufacturer approved diagnostic system, check the Generic Electronic 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 Generic Electronic Module. Refer to electrical circuit diagrams check the power and ground connections to Generic Electronic Module. Check the high speed CAN low and CAN high circuits, repair as necessary. Clear the DTC and retest. If the problem persists, suspect the Generic Electronic Module. Refer to the Warranty Policy and Procedures information if a module is suspect. Check the system is operating correctly and the DTC does not return
U0300-00	Internal Control Module Software Incompatibility - No sub type information	The Terrain response control module has failed to recognize a matching master configuration ID from the CAN data bus master The 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 exist suspect CAN Bus or CAN Bus master Control module. 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
U0401-68	Invalid Data Received From The ECM/PCM 'A' - Event information	* The Terrain response control module has detected that the Engine Control Module 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 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. If the problem persists, suspect the Engine Control Module. Refer to the Warranty Policy and Procedures information if a module is suspect
U0402-68	Invalid Data Received From The TCM - Event information	The Terrain response control module has detected that the Transmission Control Module had operated in a way or at a time that it had not been commanded to operate The 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. If the problem persists, suspect the Transmission Control Module. Refer to the Warranty Policy and Procedures information if a module is suspect
U0403-68	Invalid Data Received From The Transfer Case Control Module - Event information	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 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. If the problem persists, suspect the Transfer Case Control Module. Refer to the Warranty Policy and Procedures information if a module is suspect
U0415-68	Invalid Data Received From Anti-Lock Brake System (ABS) Control Module - Event information	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 ABS system fault ABS Module failure	Using the manufacturer approved diagnostic system, check the ABS 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. If the problem persists, suspect the ABS Module. Refer to the Warranty Policy and Procedures information if a module is suspect
U0421-68	Invalid Data Received From Suspension Control Module 'A' - Event information	The Terrain response control module has detected that the Suspension Control Module (Ride Level Module) had operated in a way or at a time that it had not been commanded to operate The Suspension Control Module is unable to support normal terrain response functionality, the terrain response system will go into default condition Suspension system fault Suspension Control Module failure	Using the manufacturer approved diagnostic system, check the Suspension 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. If the problem persists, suspect the Suspension Control Module. Refer to the Warranty Policy and Procedures information if a module is suspect
U0422-68	Invalid Data Received From Body Control Module - Event information	The Terrain response control module has detected that the Central Junction Box had operated in a way or at a time that it had not been commanded to operate The Central Junction Box is unable to support normal terrain response functionality, the terrain response system will go into default condition Central Junction Box system fault Central Junction Box failure	Using the manufacturer approved diagnostic system, check the Central Junction Box for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return. If the problem persists, suspect the Central Junction Box. Refer to the Warranty Policy and Procedures information if a module is suspect.
U043A-68	Invalid Data Received From Suspension Control Module "B" - Event information	The Terrain response control module has detected that the Suspension Control Module (Continuously Variable Damping) had operated in a way or at a time that it had not been commanded to operate The Suspension Control Module is unable to support normal terrain response functionality, the terrain response system will go into default condition Suspension system fault Suspension Control Module failure	Using the manufacturer approved diagnostic system, check the Suspension 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. If the problem persists, suspect the Suspension Control Module. Refer to the Warranty Policy and Procedures information if a module is suspect
U2101-00	Control Module Configuration Incompatible - No sub type information	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 Car 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