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Rear Differential Control Module (RDCM)

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
CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00
NOTE: If the control module 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 programme 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: When performing voltage or resistance tests, always use a digital multimeter accurate to three decimal places and with a current calibration certificate. When testing resistance, always take the resistance of the digital multimeter 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
NOTE: If the rear differential control module, rear differential actuator or the rear differential are replaced, the on demand self test (ODST) must be carried out to calibrate the components

The table below lists all diagnostic trouble codes (DTCs) that could be logged in the rear differential control module, for additional diagnosis and testing information refer to the relevant diagnosis and testing section. For additional information, refer to DIAGNOSIS AND TESTING .

DTC Description Possible Cause Action
P0562-00 System Voltage Low - no sub type information
  • Rear differential control module voltage supply below 9 volts
  • Check the battery charge condition, refer to the electrical circuit diagrams and check the wiring to the rear differential control module, repair as necessary
P0563-00 System Voltage High - no sub type information
  • System voltage high (supply voltage supply greater than 16 volts)
  • Check engine control module for stored DTCs, suspect charging system fault. Refer to the electrical circuit diagrams and check, power and ground circuit for fault
P0604-00 Internal Control Module Random Access Memory (RAM) Error - no sub type information
  • Rear differential control module internal error
  • Clear the DTC and retest. If the problem persists, renew the control module. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0605-00 Internal Control Module Read Only Memory (ROM) Error - no sub type information
  • Rear differential control module internal error
  • Clear the DTC and retest. If the problem persists, renew the control module. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0606-00 Control Module Processor - no sub type information
  • Watchdog reset - internal control module failure
  • This is a control module internal check DTC. If no other DTCs are logged and no customer complaint exists, clear/ignore this DTC. If the problem persists, renew the control module. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0607-00 Control Module Performance - no sub type information
  • Rear differential control module internal error - charge pump voltage below threshold
  • Clear the DTC and retest. If the problem persists, renew the control module. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0652-00 Sensor Reference Voltage B Circuit Low - no sub type information
  • Position sensor supply below 5.7V
  • Sensor failure (within actuator)
  • Refer to the electrical circuit diagrams and check the differential actuator sensor position circuit, repair as necessary. Clear the DTC and retest
  • If no circuit problems exist, renew the differential actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0653-00 Sensor Reference Voltage B Circuit High - no sub type information
  • Motor position sensor supply above 8.3 V
  • Internal control module failure
  • Refer to the electrical circuit diagrams and check the differential actuator hall sensor reference voltage at the control module or the actuator
  • If voltage is too high, then renew control module. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0666-00 PCM / ECM / TCM Internal Temperature Sensor A Circuit - no sub type information
  • Internal electronic control unit temperature sensor value above 105°C
  • This is a control module internal check DTC. If no other DTCs are logged and no customer complaint exists, clear this DTC and retest. Check the security of control module fixings. Check the module ground connection. Consider environmental conditions before suspecting the control module. If the problem persists, renew the control module. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0702-64 Transmission Control System Electrical - signal plausibility failure
  • Implausibility of differential motor temperature sensor and oil temperature sensor readout detected
  • Motor or oil temperature sensor circuit - short circuit to ground or power
  • Check the rear differential oil quantity and specification. Refer to the relevant information. Check both temperature sensor circuits and connectors for damage/water ingress, repair as necessary. Where available, after vehicle has been switched off for at least an hour, use the manufacturer approved diagnostic system to read motor temperature and oil temperature sensor values. Temperature difference should be less than 25°C. Clear the DTC and retest
  • Refer to the electrical circuit diagrams and check motor temperature sensor and oil sump temperature sensors and circuit for short circuit to ground, short circuit to power
P0712-00 Transmission Fluid Temperature Sensor A Circuit Low - no sub type information
  • Differential actuator internal temperature sensor circuit - open circuit or short circuit to ground
  • Refer to the electrical circuit diagrams and check rear differential actuator motor temperature sensor circuit for short circuit to ground, open circuit, high resistance. Clear the DTC and retest. If no circuit problems exist, renew the differential actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0713-00 Transmission Fluid Temperature Sensor A Circuit High - no sub type information
  • Differential actuator internal temperature sensor circuit - open circuit or short circuit to power
  • Refer to the electrical circuit diagrams and check the circuit between oil temperature sensor and control module connector, repair as necessary. Measure oil temperature sensor resistance at control module connector. Resistance should be less than 10K if oil temp >0°C. If not, suspect oil temp sensor open-circuit. If no circuit problems exist, renew the sensor. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0806-00 Clutch Position Sensor Circuit Range/Performance - no sub type information
  • Mismatch of actual and expected/calculated actuator position
  • Internal differential actuator error
  • Calibrate the clutch using the manufacturer approved diagnostic system. Clear the DTC and retest
  • If the problem persists, renew the differential actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0807-00 Clutch Position Sensor Circuit Low - no sub type information
  • Differential actuator internal position sensor supply, signal (A or B) circuit - short circuit to ground, open circuit, high resistance
  • Refer to the electrical circuit diagrams and check the differential actuator motor position hall sensor signal (A or B) circuit for short circuit to ground, open circuit, high resistance, repair as necessary. Clear the DTC and retest. If no circuit problems exist, renew the differential actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0808-00 Clutch Position Sensor Circuit High - no sub type information
  • Differential actuator internal position sensor signal (1 or 2) circuit - short circuit to power
  • Refer to the electrical circuit diagrams and check the differential actuator motor position hall sensor signal (A or B) circuit for short circuit to power, repair as necessary. Clear the DTC and retest. If no circuit problems exist, renew the differential actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P080A-00 Clutch Position Not Learned - no sub type information
  • Rear differential control module not calibrated
  • Differential clutch stuck or out of tolerance
  • Using the manufacturer approved diagnostic system, calibrate the rear differential control module. Clear the DTC, cycle ignition and retest
  • If the problem persists, check operation of the differential actuator motor and renew as neccessary. If no motor problems exist, renew the rear differential assembly. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0894-00 Transmission Component Slipping - no sub type information
  • Differential actuator internal magnetic brake is slipping
  • Clear the DTC and retest. If the problem persists, renew the differential actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P0900-00 Clutch Actuator Circuit/Open - no sub type information
  • Differential actuator supply circuit - open circuit, high resistance
  • Refer to the electrical circuit diagrams and check rear differential actuator clutch actuation motor circuit for open circuit, high resistance, repair as necessary
P0901-00 Clutch Actuator Circuit Range/Performance - no sub type information
  • Differential actuator supply circuit - short circuit. Both DC motor supply leads are short circuited together, or H Bridge overload detected
  • Refer to the electrical circuit diagrams and check the differential actuator circuit. Check the actuator circuit resistance carefully (a good motor also has a low resistance). Repair as necessary
P0902-00 Clutch Actuator Circuit Low - no sub type information
  • Differential actuator supply circuit - short circuit to ground
  • Refer to the electrical circuit diagrams and check the differential actuator circuit for short circuit to ground, repair as necessary
P0903-00 Clutch Actuator Circuit High - no sub type information
  • Differential actuator supply circuit - short circuit to power
  • Refer to the electrical circuit diagrams and check the differential actuator circuit for short circuit to power, repair as necessary
P1603-00 EEPROM Malfunction - no sub type information
  • Rear differential control module internal error
  • Clear the DTC and retest. If the problem persists, renew the control module. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P1783-00 Transmission Over-temperature Condition - no sub type information
  • Rear differential oil sump temperature sensor value above 160°C
  • Confirm the customer complaint and vehicle usage at the time of DTC event. Check the operation of the rear differential. Check the rear differential oil quantity and specification. Refer to the relevant information. Clear the DTC and retest. If the problem persists, suspect an electrical fault. Check for water ingress into wiring harness/connectors. Renew the actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P186A-00 Differential Lock-up Actuator Brake Control Circuit / Open - no sub type information
  • Open circuit, high resistance of actuator internal magnetic brake supply leads
  • Refer to the electrical circuit diagrams and check the differential actuator circuit for open circuit, high resistance repair as necessary. Clear the DTC and retest. If no circuit problems exist, renew the differential actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P186B-00 Differential Lock-up Actuator Brake Control Circuit Low - no sub type information
  • Short circuit to ground of both differential actuator internal magnetic brake pins
  • Refer to the electrical circuit diagrams and check the differential actuator circuit for short circuit to ground, repair as necessary. Clear the DTC and retest. If no circuit problems exist, renew the differential actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P186C-00 Differential Lock-up Actuator Brake Control Circuit High - no sub type information
  • Short circuit to power of both differential actuator internal magnetic brake pins
  • Refer to the electrical circuit diagrams and check the differential actuator circuit for short circuit to power, repair as necessary. Clear the DTC and retest. If no circuit problems exist, renew the differential actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P186D-00 Clutch Actuator Stuck - no sub type information
  • Actuator fault
  • Using the manufacturers approved diagnostic system, calibrate the rear differential control module/clutch actuator. Clear the DTC and retest. If the problem persists, renew the actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P2742-00 Transmission Fluid Temperature Sensor B Circuit Low - no sub type information
  • Rear differential oil sump temperature sensor short circuit to ground
  • Refer to the electrical circuit diagrams and check the differential oil temperature sensor circuit for short circuit to ground, repair as necessary
P2743-00 Transmission Fluid Temperature Sensor B Circuit High - no sub type information
  • Rear differential oil sump temperature sensor circuit - short circuit to power, open circuit, high resistance
  • Refer to the electrical circuit diagrams and check the differential oil temperature sensor circuit for short circuit to power, open circuit, high resistance, repair as necessary
P2785-00 Clutch Actuator Temperature Too High - no sub type information
  • Clutch actuator temperature sensor value above 150°C - insufficient oil quantity, incorrect oil specification or internal actuator problem
  • Confirm the customer complaint and vehicle usage at the time of DTC event. Check the operation of the rear differential. Check the rear differential oil quantity and specification. Refer to the relevant information. Clear the DTC and retest. If the problem persists, renew the actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
P2787-00 Clutch Temperature Too High - no sub type information
  • Rear differential clutch pack temperature (calculated) above 200°C
  • Confirm the customer complaint and vehicle usage at the time of DTC event. Check the operation of the rear differential. Check the rear differential oil quantity and specification. Refer to the relevant information. Clear the DTC and retest. If the problem persists, renew the actuator. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
U0001-88 High Speed CAN Communication - Bus off
  • High speed CAN bus off detected
  • 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 ECM/PCM ""A"" - no sub type information
  • Lost communication with engine control module (CAN bus circuit fault)
  • 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 between the engine control module and rear differential control module
U0121-00 Lost Communication With Anti-Lock Brake System (ABS) Control Module - no sub type information
  • Lost communication with ABS control module (CAN bus circuit fault)
  • 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 between the ABS control module and rear differential control module
U0139-00 Lost Communication With Suspension Control Module ""B"" - no sub type information
  • Lost communication with adaptive damping module (CAN bus circuit fault)
  • 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 between the adaptive damping module and rear differential control module
U0155-00 Lost Communication With Instrument Panel Cluster Control Module - no sub type information
  • Lost communication with instrument panel cluster control module (CAN bus circuit fault)
  • 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 between the instrument panel cluster control module and rear differential control module
U0300-00 Internal Control Module Software Incompatibility - no sub type information
  • Rear differential control module not configured - incorrect software installed
  • Check and confirm correct rear differential control module is installed. If correct, clear DTC, ignition off for 5 seconds, ignition on and then check if DTC reoccurs. If the problem persists, configure the module using the manufacturer approved diagnostic system
U0415-68 Invalid Data Received From Anti-Lock Brake System (ABS) Control Module - event information
  • Invalid data received
  • 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 between the ABS module and rear differential control module
U043A-68 Invalid Data Received From Suspension Control Module ""B"" - event information
  • Invalid data received
  • Check adaptive damping module for stored DTCs and refer to the relevant DTC index
U1A14-49 CAN Initialization Failure - internal electronic failure
  • Rear differential control module has failed the CAN serial data communication software initialization
  • Internal control module failure
  • Clear the DTC and retest. If the problem persists, configure the module using the manufacturers approved diagnostic system. Clear the DTC and retest
  • If the problem persists, renew the rear differential control module. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
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