Transfer Case - BW 4477

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 36
- Electronic Control Unit Malfunction EEPROM Failure

Diagnostic Fault Information





Circuit/System Description

This DTC indicates an EEPROM failure where diagnostic data is stored.

Conditions for Running the DTC

* The ignition is ON.
* System voltage is 9-16 volts.

Conditions for Setting the DTC

The EEPROM has failed and diagnostic data as well as other assorted data can not be stored.

Action Taken When the DTC Sets

* Activation is still disabled until the conditions for setting the DTC are no longer present.
* The SERVICE AWD indicator remains illuminated for the remainder of the current ignition cycle.

Conditions for Clearing the DTC

* The transfer case shift control module clears the DTC if the conditions for setting the DTC are not currently present.
* A history DTC clears after 40 consecutive warm up cycles without a fault present.
* All DTCs can be cleared using a scan tool.
* Clearing DTCs will also clear failure records.

Diagnostic Aids

* Check failure records for further information on the conditions present when this DTC set.
* It is sometimes possible to set this DTC falsely due to low voltage. Attempt to clear this DTC and retest.

Reference Information
Schematic Reference

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

Component Connector End Views (Connector Views)
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)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

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

Circuit/System Testing

If this DTC sets attempt to clear the DTC and Retest.

If the DTC is cleared, but then resets then replace the transfer case control module.

Repair Instructions

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

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