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

DTC C0550 01
- Electronic Control Unit (ECU) Performance Short to Battery

DTC C0550 04
- Electronic Control Unit (ECU) Performance Open Circuit




Circuit/System Description

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


Conditions for Running the DTC

The ignition switch is in the ON position.


Conditions for Setting the DTC

An internal EBCM malfunction exists.


Action Taken When the DTC Sets

One or more of the following actions may occur:

* The EBCM disables the antilock brake system (ABS).
* The EBCM disables or degrades the dynamic rear proportining (DRP) function.
* The ABS indicator illuminates.
* The vehicle dynamics caution (VDC) indicator illuminates.
* The brake warning indicator illuminates.
* The driver information center (DIC) displays the BRAKE message.



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

Control Module References (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.