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 C0131 00: ABS/TCS Pressure Circuit.

Circuit/System Description

The Electronic Brake Control Module (EBCM) detects an internal malfunction.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

EBCM detects a fault in the hydraulic modulator pressure sensor signal voltage output.

Action Taken When the DTC Sets

    • The EBCM disables the ABS-TCS/ESP for the duration of the ignition cycle.
    • One or all of the following warning indicators may activate:
       - ABS-TCS warning indicator
       - ABS-TCS warning display
       - ESP warning indicator
       - Red Brake Warning indicator
       - Trac-off warning display

Conditions for Clearing the DTC

The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Reference Information

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

Scan Tool Data List

Circuit/System Verification

DTC C0131 will set as result of internal (EBCM) circuit failure.

Replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification

Control Module References