Rear Differential Control Module (RDCM)

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.

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 Information. Refer to REAR DRIVE AXLE AND DIFFERENTIAL .

DTC	Description	Possible Causes	Action
P0562-00	System Voltage Low - No sub type information	Rear Differential Control Module voltage supply below 9V	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 information if a module is suspect
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 information if a module is suspect
P0606-00	Control Module Processor - No sub type information	Watch dog reset - Internal control module failure	This is a control module internal check DTC and is not necessarily a fault. 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 information if a module is suspect
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 information if a module is suspect
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. If no circuit problems exist, renew the differential actuator
P0653-00	Sensor Reference Voltage 'B' Circuit High - No sub type information	Position sensor supply above 8.3V Internal control module failure	Refer to the electrical circuit diagrams and check the differential actuator hall sensor ref voltage at the control module or the actuator. If voltage is too high, then suspect control module fault. Refer to the Warranty Policy and Procedures information if a module is suspect
P0666-00	PCM/ECM/TCM Internal Temperature Sensor 'A' Circuit - No sub type information	Rear Differential Control Module internal temperature sensor value above 105°C	This is a control module internal check DTC and is not necessarily a fault. 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 information if a module is suspect
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 workshop 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
P0712-00	Transmission Fluid Temperature Sensor 'A' Circuit Low - No sub type information	Differential actuator internal temperature sensor open circuit or short circuit to ground	Refer to the electrical circuit diagrams and check the differential actuator sensor circuit, repair as necessary. If no circuit problems exist, renew the differential actuator
P0713-00	Transmission Fluid Temperature Sensor 'A' Circuit High - No sub type information	Differential actuator internal temperature sensor open circuit or short circuit to power	Refer to the electrical circuit diagrams and check the circuit between oil temp sensor and control module connector, repair as necessary. Measure oil temp 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
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 and range change mechanism using the manufacturer approved diagnostic system. Clear the DTC and retest. If the problem persists, renew the differential actuator
P0807-00	Clutch Position Sensor Circuit Low - No sub type information	Differential actuator internal position sensor supply, ground, signal A or B open circuit or sensor supply, signal A or B short circuit to ground	Refer to the electrical circuit diagrams and check the differential actuator motor position hall sensor signal circuit (A or B), repair as necessary. If no circuit problems exist, renew the differential actuator
P0808-00	Clutch Position Sensor Circuit High - No sub type information	Differential actuator internal position sensor signal 1 or 2 short circuit to power	Refer to the electrical circuit diagrams and check the differential actuator motor position hall sensor signal circuit (A or B), repair as necessary. If no circuit problems exist, renew the differential actuator
P080A-00	Clutch Position Not Learned - No sub type information	Rear Differential Control Module (RDCM) not calibrated Differential clutch stuck or out of tolerance	Using the manufacturer approved diagnostic system, calibrate the Rear Differential Control Module. Clear the DTC and retest. If the problem persists, renew the rear differential assembly. Refer to the Warranty Policy and Procedures information if a differential is suspect.
P0894-00	Transmission Component Slipping - No sub type information	Differential actuator internal magnetic brake is slipping	Renew the differential actuator
P0900-00	Clutch Actuator Circuit/Open - No sub type information	Differential actuator supply open circuit	Refer to the electrical circuit diagrams and check the differential actuator circuit, repair as necessary
P0901-00	Clutch Actuator Circuit Range/Performance - No sub type information	Differential actuator supply short circuit Both DC motor supply leads are short circuited together 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 to ground.	Refer to the electrical circuit diagrams and check the differential actuator circuit, repair as necessary
P0903-00	Clutch Actuator Circuit High - No sub type information	Differential actuator supply circuit short to power	Refer to the electrical circuit diagrams and check the differential actuator circuit, 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 information if a module is suspect
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 workshop 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
P186A-00	Differential Lock-Up Actuator Brake Control Circuit/Open - No sub type information	Open circuit of actuator internal magnetic brake supply leads	Refer to the electrical circuit diagrams and check the differential actuator circuit, repair as necessary. If no circuit problems exist, renew the differential actuator
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, repair as necessary. If no circuit problems exist, renew the differential actuator
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, repair as necessary. If no circuit problems exist, renew the differential actuator
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. If the problem persists, renew the actuator
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, repair as necessary
P2743-00	Transmission Fluid Temperature Sensor 'B' Circuit High - No sub type information	Rear differential oil sump temperature sensor open circuit or short circuit to power	Refer to the electrical circuit diagrams and check the differential oil temperature sensor circuit, repair as necessary
P2785-00	Clutch Actuator Temperature Too High - No sub type information	Extensive prolonged off-road use Insufficient oil quantity Incorrect oil specification Internal actuator problem	Check for other DTCs (e.g. P186B). If multiple DTCs exist, suspect a control module internal fault. 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 workshop information. Clear the DTC and retest. If the problem persists, renew the actuator
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 workshop information. Clear the DTC and retest. If the problem persists, renew the actuator
U0001-88	High Speed CAN Communication Bus - Bus off	Bus off	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	No sub type information	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
U0102-00	Lost Communication With Transfer Case Control Module - No sub type information	No sub type information	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 Transfer Case Control Module and Rear Differential Control Module
U0121-00	Lost Communication With Anti-Lock Brake System (ABS) Control Module - No sub type information	No sub type information	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 Anti-lock Braking System module and Rear Differential Control Module
U0140-00	Lost Communication With Body Control Module - No sub type information	No sub type information	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 Central Junction Box 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 & confirm differential control module installed is correct. 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 manufacturers approved diagnostic system
U0403-68	Invalid Data Received From Transfer Case Control Module - Event information	Event information	Check the transfer case control module for related DTCs and refer to the relevant DTC index
U0415-68	Lost Communication With Anti-Lock Brake System (ABS) Control Module - Event information	Event information	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 Anti-lock Braking System module and Rear Differential Control Module
U0422-68	Invalid Data Received from Body Control Module - Event information	Event information- invalid vehicle configuration message	Check the generic electronics module for related DTCs and refer to the relevant DTC index
U0443-68	Invalid Data Received From Body Control Module "B" - Event information	Event information	Check the generic electronics module for related 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 or the CAN controller 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 control module. Refer to the Warranty Policy and Procedures information if a module is suspect