GM Service Manual Online
For 1990-2009 cars only

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 C1FFF 00: Electronic Brake Control Module (EBCM) Indicated Hardware Malfunction

Circuit/System Description

The engine control module (ECM) detects the EBCM has an internal malfunction.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

An internal EBCM Malfunction exists.

Action Taken When the DTC Sets

    • The antilock brake system (ABS) and vehicle stability enhancement system (VSES) are disabled.
    • The warning indicators will illuminate.

Conditions for Clearing the DTC

    • The condition for the DTC is no longer present.
    • The ECM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS 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 C1FFF is not current.

If the DTC is current, replace the EBCM

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming