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 Descriptors

DTC C0131 00

Traction Control System Pressure Circuit Malfunction

DTC C0131 5A

Traction Control System Pressure Circuit Not Plausible

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5V Reference	C0131 00	C0131 00	C0131 00	-
Signal	C0131 00	C0131 00	-	C0131 5A

Circuit/System Description

The brake pressure sensor is integral to the brake pressure modulator valve assembly. The electronic brake control module (EBCM) monitors the brake pressure sensor supply voltage and the signal voltage. The body control module (BCM) sends a serial data message when the brake pedal is applied.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

C0131 00

•	A short to voltage is detected on the 5 V reference circuit for 0.1 s

•	A short to ground or an open/high resistance is detected on the 5 V reference circuit or signal circuit for 0.1 s

C0131 5A

•	The brake pressure sensor signal is not plausible with the vehicle acceleration or deceleration.

•	The EBCM detected an invalid or erratic brake pressure sensor signal.

•	The brake pressure sensor signal is not plausible with the brake switch signal.

Action Taken When the DTC Sets

•	The EBCM disables the ABS, traction control, stability control and hill start assist for the duration of the ignition cycle.

•	The traction control/stability control-active indicator turns ON.

Conditions for Clearing the DTC

•	A current DTC clears when the diagnostic runs and passes.

•	The EBCM will turn OFF the indicator in the next ignition cycle.

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

Ignition ON, observe the scan tool Brake Pressure Sensor parameter. The reading should be 0 V, when brake pedal is released and greater than 1 V, when the brake pedal is applied.

Circuit/System Testing

1.	Verify that DTC C0131 5A is not present.

2.	If DTC C0131 5A is present, perform the Brake Pressure Modulator Valve Pressure Sensor Calibration.

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

4.	If the DTC resets replace the K17 Electronic Brake Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References