What it means
The measured driver-applied brake pressure is higher than the control module expects. The code alone does not identify the cause.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
The brake control module compares measured driver-applied brake pressure with the pressure it expects from the current braking conditions. This code sets when the reported pressure is higher than expected, but the code alone cannot distinguish a pressure-sensor problem from a hydraulic fault.
Common causes
Most likely first.
- Brake pressure sensor or circuit fault
- Hydraulic system fault
Symptoms
- ABS warning light on
- ESC/stability control may be disabled
How to diagnose it
- Read freeze-frame and live brake data for driver-applied pressure, pedal input, and related pressure readings to see when the unexpected high value occurs.
- Check the brake-fluid level and inspect the master cylinder, hydraulic lines, hoses, and wheels for leaks or visible damage.
- Compare pressure-sensor readings at rest and during gentle pedal application, checking for a value that is implausible or inconsistent with pedal input.
- Inspect the pressure-sensor connector and wiring for corrosion, loose pins, chafing, or shorts.
- Test the pressure-sensor supply, ground, and signal circuit against the manufacturer's specification; if readings remain plausible, investigate the hydraulic system using the service procedure.
Common fixes
- Secure or repair a loose, corroded, or damaged pressure-sensor connector or wire.
- Correct a brake-fluid leak or other confirmed hydraulic fault.
- Replace a pressure sensor that fails the manufacturer's circuit or plausibility checks.
- Repair the hydraulic control or master-cylinder fault identified by testing.
Can I keep driving?
If the brake pedal feels abnormal, braking is reduced, or a leak is present, do not drive the vehicle. Otherwise drive cautiously to repair, allowing extra stopping distance because ABS or stability control may be limited.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.