Brake System Pressure Sensor Fault
Indicates an issue with the brake system pressure sensor.
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What it means (plain English)
The computer is getting a signal from the brake pressure sensor that doesn't match the expected values, which could cause the brakes to fail or not work properly.
What the computer is actually seeing
The brake pressure sensor should send a voltage signal between 0.5V and 4.5V proportional to the actual pressure. A fault indicates readings far outside this range, or a complete failure to send a signal.
What a healthy reading looks like
Expected brake pressure voltage should be between 0.5V (0 PSI) and 4.5V (typically around 1500 PSI).
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.
- 11. Check the brake fluid level; it should be between the min and max marks on the reservoir. If low, top it off with the correct type of fluid and recheck code.
- 22. Inspect the wiring and connectors going to the brake pressure sensor for signs of damage or corrosion. Repair any issues found.
- 33. Measure the voltage at the brake pressure sensor while applying the brakes. Ensure the values fall between 0.5V and 4.5V. If not, replace the sensor.
- 44. If the sensor reads correctly but the code persists, perform a system scan for related faults.
- 55. Clear the code and monitor for reoccurrence. If the code returns, further diagnose the brake system including the master cylinder or ABS module.
Common causes
- Wiring harness damage or corrosion in connectors
- Faulty brake pressure sensor
- Low brake fluid level or contaminated fluid
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's not safe. A failure in the brake pressure sensor can lead to brake system issues.
Will the code come back after clearing it?
If the underlying issue isn't fixed, yes, it will likely come back.
Why does this code pair with other SPNs?
These codes often indicate related issues within the brake system and can occur together when there are faults.
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