Brake System Pressure Sensor Fault
The brake system pressure sensor has detected a fault.
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What it means (plain English)
The brake system pressure sensor is responsible for measuring the fluid pressure in the brake system. When it sees a value outside its normal range, it triggers a fault code. This could mean the sensor is damaged, the brake fluid is low, or there’s a leak in the system causing erratic readings.
What the computer is actually seeing
The computer monitors the brake pressure sensor input, typically looking for voltages between 0.5V to 4.5V depending on the system pressure. When the voltage signal exceeds the expected range—often when it drops below 0.2V or exceeds 4.9V for a certain duration—this fault code activates.
What a healthy reading looks like
Expected voltages from the brake pressure sensor should be between 0.5V and 4.5V, correlating to 10 to 120 psi of system pressure depending on the vehicle type.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check brake fluid level—should be between MIN and MAX marks on the reservoir. Add fluid if low.
- 2Inspect wiring and connectors going to the brake pressure sensor for any visible damage or corrosion.
- 3Use a multimeter to test the voltage at the sensor—should be between 0.5V and 4.5V when the brakes are applied. If out of range, sensor may need replacement.
- 4Test the brake pressure sensor using a scan tool—compare the sensor values to actual brake pressure readings with a gauge. If they don't match, replace the sensor.
Common causes
- Damaged brake pressure sensor
- Low brake fluid level
- Brake fluid leak in the system
- Faulty wiring or connector to the sensor
- Contaminated brake fluid
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not advisable to drive with this code, as it may indicate compromised braking performance.
Will this fault come back after repair?
If the underlying issue is fixed (like a new sensor or proper fluid levels), it should not return.
Why does this code trigger in conjunction with other codes?
Often, the brake system has interrelated components; faults in one can affect others, causing multiple codes.
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