(With JL4)

DTC C0131 (With JL4)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0131 01
- ABS Pressure Circuit Short to Battery

DTC C0131 06
- ABS Pressure Circuit Short to Ground or Open

DTC C0131 55
- ABS Pressure Circuit Expected Number of Transition/Events Exceeded

DTC C0131 5A
- ABS Pressure Circuit Plausibility Failure

DTC C0131 0F
- ABS Pressure Circuit Erratic

Circuit/System Description

The body control module (BCM) sends a serial data message when the brake pedal is applied. The electronic brake control module (EBCM) compares the brake pressure sensor values to ensure they agree with the brake pedal applied signal.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

* Brake signal does not correlate to pressure signal.

* Signal is erratic and changes faster than physically allowed.

Action Taken When the DTC Sets

* The Traction Control indicator turns ON.

* The driver information center displays the Service Stability System message.

Conditions for Clearing the DTC

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

Diagnostic Aids

* DTC C0131 5A can set if the brake is applied while accelerating.

* This DTC may set during off road driving in sand or hilly terrain.

* Anything that may cause the vehicle to decelerate without the brake pedal being applied.

* The electric trailer brake is applied without the brake pedal being applied.

* Inform the customer that this DTC will set if the brake is applied for 60 seconds while at speeds greater than 21 km/h (13 mph), such as a two footed driving.

Reference Information

Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

ABS Description and Operation (Without JL4) Description and OperationABS Description and Operation (With JL4) Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

1. Apply and release brake pedal. Verify brake lamps operate properly.

• If brake lamps do not operate properly, refer to Symptoms - Lighting Symptoms - Lighting.

2. Replace the brake pressure modulator valve and verify the DTC does not reset.

• If the DTC resets, replace the EBCM.

Repair Instructions

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

* Brake Pressure Modulator Valve Replacement (Without JL4) Brake Pressure Modulator Valve Replacement (Without JL4)Brake Pressure Modulator Valve Replacement (With JL4) Brake Pressure Modulator Valve Replacement (With JL4)

* Control Module References Control Module References for EBCM replacement, programming and setup