Getrag 790 - Transfer Case

DTC C0550

Diagnostic Instructions

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



DTC Descriptor
DTC C0550 35
- Electronic Control Unit (ECU) Performance ROM Failure

DTC C0550 39
- Electronic Control Unit (ECU) Performance Internal Electronic Failure




Circuit/System Description

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


Conditions for Running the DTC

The ignition switch is in the ON position.


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), DIC message
* Service All Wheel Drive (Service AWD), DIC message



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
Description and Operation

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

* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information


Circuit/System Verification

Verify DTC C0550 is not current.

If DTC C0550 is current, replace the CCM.



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Control Module References for CCM replacement, setup, and programming