C0131

DTC C0131

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 00
- Traction Control System Pressure Circuit Malfunction

DTC C0131 5A
- Traction Control System Pressure Circuit Not Plausible

Circuit/System Description

The Electronic Brake Control Module monitors the Brake Pressure Sensor which is integral to the Brake Pressure Modulator. The Body Control Module monitors the Brake Pedal Position Sensor Signal when the brake pedal is applied and sends a serial data message to the Electronic Brake Control Module indicating the brake pedal position. The Electronic Brake Control Module compares the brake pressure to the brake pedal position and uses this information for Vehicle Stability Control.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

C0131 00

The Electronic Brake Control Module detects the brake pressure is out of specified range.

C0131 5A

The Electronic Brake Control Module does not detect that the master cylinder pressure changed after driving the vehicle at a speed greater than 40 km/h (25 MPH) and performing three brake stops.

Action Taken When the DTC Sets

* The Tractionl/stability Control Indicator Off turns ON.

* The Electronic Brake Control Module disables the Traction/stability or the duration of the ignition cycle, and the ABS remains functional.

Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present.

* The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

Diagnose all other stop lamp DTCs or Symptoms prior to performing this diagnostic procedure.

Reference Information

Schematic Reference

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

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

ABS Description and Operation 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 Verification

1. Ignition ON.

2. Verify the stop lamps turn ON and OFF while applying and releasing the brake pedal.

• If the stop lamps do not turn ON and OFF
Refer to Symptoms - Lighting Symptoms - Lighting.

• If the stop lamps turn ON and OFF

3. Verify the Brake Pedal Position Sensor or the brake pedal are not binding causing residual brake pressure to be detected, while the brake lights operate properly.

• If a condition is found
Repair or replace the applicable component.

• If a condition is not found

4. Verify the scan tool Brake Pressure Sensor parameter changes from 0 V to 1 V when the brake pedal is applied.

• If the Brake Pressure Sensor parameter does not change

1. Replace the Q5 Brake Pressure Modulator.

2. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.

• If the DTC sets, replace the K17 Electronic Brake Control Module.

• If the DTC does not set.

3. All OK.

• If the Brake Pressure Sensor parameter changes

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Brake Pressure Modulator Valve Replacement Brake Pressure Modulator Valve Replacement

* Control Module References Control Module References for Electronic Brake Control Module replacement, programming and setup