Rear Differential Control Module (RDCM): DTCs

REAR DIFFERENTIAL CONTROL MODULE (RDCM) DTCs

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 condemning 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 instructions of the 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 instructions of the 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 instructions of the 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 instructions of the workshop information. Clear the DTC and retest. If the problem persists, renew the actuator.
U0001-88	High Speed CAN Communication Bus - Bus off	CAN 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.