Transfer Case - Getrag 760

DTC C0550

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC C0550 35
- ROM Checksum Error

DTC C0550 39
- Internal Communication Error

Circuit/System Description

The rear differential clutch control module (CCM) detects an internal malfunction.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

An internal CCM malfunction exists.

Action Taken When the DTC Sets

One or more of the following actions may occur:

* All Wheel Drive Off (AWD Disabled).
* Service All Wheel Drive (Service AWD).

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The DTC is not detected in 40 consecutive drive cycles.

Reference Information
Schematic Reference

All-Wheel Drive Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

All-Wheel Drive Description and Operation (All-Wheel Drive Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Note: DTC C0550 may set due to low battery voltage. Verify that the battery is fully charged before proceeding with this diagnostic.

Verify that DTC C0550 is not set.

If the DTC is set, perform the CCM RDS matching ID. If the DTC resets, replace the CCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for CCM replacement, setup, and programming