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

For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Diagnostic Trouble Code (DTC) Index - DTC: Rear Differential Control Module (RDCM) article.