:  Dec 21, 2007



Principle of Operation

For additional information, refer to section 205-02 - Rear Drive Axle/Differential of the workshop manual.

Inspection and Verification

. Verify the customer concern.

. Confirm which, if any, warning lights and/or messages were displayed on the instrument cluster. For a list of messages, refer to the relevant section of the workshop manual.

. Visually inspect for obvious mechanical or electrical faults.

Mechanical Electrical
  • Differential oil leakage
  • Sensor installation
  • power
  • Fuse(s)
  • Wiring harness physical damage or water ingress
  • Loose or corroded electrical connectors
  • Controller area network (CAN) circuits
  • Sensors
  • Rear differential control module

. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

. Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index.
  Make sure that all DTCs are cleared following rectification.
Make sure that all DTCs are cleared following rectification.

Symptom Chart

Symptom Possible message Possible other warnings Possible causes Action
Running at reduced capability with fault present
  • Rear differential fault
  • Driveline overheat warning lamp illuminated
  • Rear differential/driveline fault warning lamp illuminated
  • Water ingress to wiring harness or connectors
  • Reduced differential capability
  • Differential increased tolerances
  • Internal fault
  • Rear differential control module fault (Rear differential control module)
Visually inspect the wiring harness and connectors for water ingress. Refer to the warranty policy and procedures manual if a module is suspect.
Rear differential overheat
  • Rear differential Overheat Slow Down
  • Driveline overheat warning lamp illuminated
  • Oil level incorrect
  • Oil level incorrect specification
  • Sensor fault
  • Internal fault
Check for correct oil quantity and specifications. Refer to the relevant section of the workshop manual.

DTC index

:
  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).

:
  Intermittent faults may cause DTCs to be logged, however some DTCs may be cleared during an ignition off, ignition on cycle. Carry out a road test (if safe to do so), check the functionality of the system and retrieve any DTCs before turning the ignition off.

DTC Description Possible causes Action
P056200 System Voltage Low
  • Rear differential control module voltage supply below 9V
Check the power charge condition, refer to the electrical guides and check the differential actuator sensor circuit, repair as necessary.
P056300 System Voltage High
  • Rear differential control module voltage supply below 16V
Check the charging circuit and power condition.
P060400 Internal Control Module Random Access Memory (RAM) Error
  • 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 if a module is suspect.
P060500 Internal Control Module Read Only Memory (ROM) Error
  • 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 if a module is suspect.
P060600 Control Module Processor
  • Watchdog reset
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.
P060700 Control Module Performance
  • 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 if a module is suspect.
P065200 Sensor Reference Voltage 'B' Circuit Low
  • Actuator internal position sensor supply voltage below 57V
Refer to the electrical guides and check the differential actuator sensor position circuit, repair as necessary. If no circuit problems exist, renew the differential actuator.
P065300 Sensor Reference Voltage 'B' Circuit High
  • Actuator internal position sensor supply voltage below 83V
Refer to the electrical guides and check the differential actuator sensor position circuit, repair as necessary. If no circuit problems exist, renew the differential actuator.
P066600 PCM/ECM/TCM Internal Temperature Sensor 'A' Circuit
  • 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. If the problem persists, renew the control module. Refer to the warranty policy and procedures manual if a module is suspect.
P071200 Transmission Fluid Temperature Sensor 'A' Circuit Low
  • Differential actuator internal temperature sensor open circuit or short circuit to ground
Refer to the electrical guides and check the differential actuator sensor circuit, repair as necessary. If no circuit problems exist, renew the differential actuator.
P071300 Transmission Fluid Temperature Sensor 'A' Circuit High
  • Differential actuator internal temperature sensor open circuit or short circuit to power
Refer to the electrical guides and check the differential actuator sensor circuit, repair as necessary. If no circuit problems exist, renew the differential actuator.
P080600 Clutch Position Sensor Circuit Range/Performance
  • Mismatch of actual and expected/calculated actuator position Internal differential actuator error
Calibrate the clutch and range change mechanism using the approved diagnostic system or by the procedure listed in the description and operation. Refer to the relevant section of the workshop manual. Clear the DTC and retest. If the problem persists, renew the differential actuator.
P080700 Clutch Position Sensor Circuit Low
  • Differential actuator internal position sensor supply, ground, signal 1 or 2 open circuit or sensor supply, signal 1 or 2 short circuit to ground
Refer to the electrical guides and check the differential actuator circuit, repair as necessary. If no circuit problems exist, renew the differential actuator.
P080800 Clutch Position Sensor Circuit High
  • Differential actuator internal position sensor signal 1 or 2 short circuit to power
Refer to the electrical guides and check the differential actuator circuit, repair as necessary. If no circuit problems exist, renew the differential actuator.
P080A00 Clutch Position Not Learned
  • Rear differential control module (RDCM) not calibrated
  • Differential clutch stuck or out of tolerance
Using the approved diagnostic equipment, 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 manual if a differential is suspect.
P089400 Transmission Component Slipping
  • Differential actuator internal magnetic brake is slipping
Renew the differential actuator.
P090000 Clutch Actuator Circuit/Open
  • Differential actuator supply open circuit
Refer to the electrical guides and check the differential actuator circuit, repair as necessary.
P090100 Clutch Actuator Circuit Range/Performance
  • Differential actuator supply short circuit
Refer to the electrical guides and check the differential actuator circuit, repair as necessary.
P090200 Clutch Actuator Circuit Low
  • Differential actuator supply circuit short to ground.
Refer to the electrical guides and check the differential actuator circuit, repair as necessary.
P090300 Clutch Actuator Circuit High
  • Differential actuator supply circuit short to power
Refer to the electrical guides and check the differential actuator circuit, repair as necessary.
P160300 EEPROM Malfunction
  • 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 if a module is suspect.
P178300 Transmission Over-Temperature Condition
  • Rear Differential oil sump temperature sensor value above 150°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 section of the workshop manual. Clear the DTC and retest. If the problem persists, renew the rear differential assembly. Refer to the warranty policy and procedures manual if a differential is suspect.
P186A00 Differential Lock-Up Actuator Brake Control Circuit/Open
  • Open circuit of actuator internal magnetic brake supply leads
Refer to the electrical guides and check the differential actuator circuit, repair as necessary. If no circuit problems exist, renew the differential actuator.
P186B00 Differential Lock-Up Actuator Brake Control Circuit Low
  • Short circuit to ground of both differential actuator internal magnetic brake pins
Refer to the electrical guides and check the differential actuator circuit, repair as necessary. If no circuit problems exist, renew the differential actuator.
P186C00 Differential Lock-Up Actuator Brake Control Circuit High
  • Short circuit to power of both differential actuator internal magnetic brake pins
Refer to the electrical guides and check the differential actuator circuit, repair as necessary. If no circuit problems exist, renew the differential actuator.
P186D00 Clutch Actuator Stuck
  • Actuator fault
Using the approved diagnostic equipment, calibrate the rear differential control module/clutch actuator. Clear the DTC and retest. If the problem persists, renew the actuator.
P274200 Transmission Fluid Temperature Sensor 'B' Circuit Low
  • Rear differential oil sump temperature sensor short circuit to ground
Refer to the electrical guides and check the differential oil temperature sensor circuit, repair as necessary.
P274300 Transmission Fluid Temperature Sensor 'B' Circuit High
  • Rear differential oil sump temperature sensor open circuit or short circuit to power
Refer to the electrical guides and check the differential oil temperature sensor circuit, repair as necessary.
P278500 Clutch Actuator Temperature Too High
  • Actuator internal temperature sensor value above 150°C Extensive prolonged off-road use Insufficient oil quantity Incorrect oil specification Internal differential 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 section of the workshop manual. Clear the DTC and retest. If the problem persists, renew the rear differential assembly. Refer to the warranty policy and procedures manual if a differential is suspect.
P278700 Clutch Temperature Too High
  • 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 section of the workshop manual. Clear the DTC and retest. If the problem persists, renew the rear differential assembly. Refer to the warranty policy and procedures manual if a differential is suspect.
U000188 High Speed CAN Communication Bus
  • High speed CAN communication Bus (CAN Bus Off)
Refer to the Network Communications section of the workshop manual.
U010287 Lost Communication With Transfer Case Control Module
  • Lost communication with TCCM
Refer to the bus off statement within workshop manual section 418-00. Refer to the Network Communications section of the workshop manual.
U012287 Lost Communication With Vehicle Dynamics Control Module
  • Lost communication with VDM
Refer to the bus off statement within workshop manual section 418-00. Refer to the Network Communications section of the workshop manual.
U030055 Internal Control Module Software Incompatibility
  • Rear differential control module not configured
Configure the module using the approved diagnostic system.
U1A1449 CAN Initialization Failure
  • Rear differential control module supervision software failure
  • Internal control module failure
Configure the module using the approved diagnostic system. Clear the DTC and retest. If the problem persists, renew the control module. Refer to the warranty policy and procedures manual if a module is suspect.