C0131
ABS/TCS Pressure Circuit Malfunction
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Code C0131 indicates that the Electronic Brake Control Module has detected a malfunction in the ABS/TCS brake pressure circuit. The EBCM uses a brake pressure sensor — built into the Brake Pressure Modulator Valve (BPMV) — to measure actual hydraulic brake pressure. It compares this reading to the brake pedal position to precisely manage traction control and vehicle stability functions.
When this code appears, the traction control system (TCS) and electronic stability control are disabled, though the basic ABS function may still operate. You will likely see a traction control light and possibly a "Service StabiliTrak" or similar message. Your regular brakes continue to work normally, but you lose the advanced electronic braking aids that help maintain vehicle stability.
This is a code that can be expensive to repair. Because the pressure sensor is integrated into the BPMV and is not separately serviceable, the typical repair involves replacing the entire BPMV assembly. In some cases, both the BPMV and the EBCM need to be replaced together, and the new EBCM must be programmed to the vehicle. Have a qualified technician diagnose this within the week, as traction and stability control are important safety features.
Severity
Symptoms
- •Traction control warning light illuminated
- •Service StabiliTrak or Service Stability message on display
- •ABS warning light may be on
- •Loss of traction control and stability control functions
- •Reduced confidence in braking on slippery surfaces
- •Brake pedal may feel normal despite warning lights
Likely Causes
The brake pressure sensor is integral to the Brake Pressure Modulator Valve (BPMV). When this sensor fails, the EBCM cannot determine actual brake pressure, disabling traction and stability control.
The Electronic Brake Control Module may have an internal processing error when comparing brake pressure data to brake pedal position, triggering this code.
The multi-pin connector between the BPMV and EBCM can develop corrosion, loose pins, or damaged wires, especially if brake fluid has leaked onto the connector.
Internal leaks or stuck valves within the Brake Pressure Modulator Valve can create pressure readings that the EBCM interprets as sensor circuit malfunctions.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the Brake Pressure Modulator Valve (BPMV) assembly
- Replace the EBCM and reprogram to the vehicle
- Inspect and repair wiring and connectors between BPMV and EBCM
- Replace both BPMV and EBCM as a unit if sensor failure is confirmed