Antilock Brake System

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 00
- Electronic Control Unit (ECU) Performance




Circuit/System Description

The electronic brake control module (EBCM) detects an internal malfunction.


Conditions for Running the MIL/DTC

The ignition switch is in the ON position.


Conditions for Setting the MIL/DTC

An internal EBCM malfunction exists.


Action Taken When the MIL/DTC Sets

One or more of the following actions may occur:

* The antilock brake system (ABS) and vehicle stability enhancement system (VSES) are disabled.
* TCS is degraded.
* The ABS/TCS indicators turn ON.
* The red BRAKE Warning indicator turns ON.



Conditions for Clearing the MIL/DTC

* The ABS indicator may remain illuminated after the DTCs are cleared, until the vehicle is operated at speeds greater than 13km/h (8mph) and the self test is completed.
* The condition for the DTC is no longer present.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.



Diagnostic Aids

Verify that the EBCM power and ground circuits are good if the DTC C0550 is stored in history.


Reference Information
Schematic Reference

Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (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

Programming and Relearning (Programming and Relearning)for Scan Tool Information


Circuit/System Verification

Verify DTC C0550 is not current.

If DTC C0550 is current, replace the EBCM.



Repair Instructions

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


Programming and Relearning (Programming and Relearning)for EBCM replacement, setup, and programming