Rear Drive Axle

DTC C0550

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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) Checksum Error

DTC C0550 39

- Electronic Control Unit (ECU) Internal Communication Error

Diagnostic Fault Information





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).
* 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 100 consecutive drive cycles.

Reference Information

Schematic Reference

All-Wheel Drive Schematics

Connector End View Reference

Transfer Case Control Connector End Views

Electrical Information Reference

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

Scan Tool Reference

Scan Tool Data List for CCM

Circuit/System Verification

DTC C0550 will set as result of internal CCM circuit failure.

Replace the CCM.

Repair Instructions

Control Module References for CCM replacement, setup, and programming.

Repair Verification

Diagnostic Repair Verification