Brake Pressure Sensor Circuit Low Input
The brake pressure sensor is reporting a low voltage signal.
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What it means (plain English)
The brake pressure sensor is supposed to send a voltage signal depending on how hard you press the brake pedal, but it's sending a voltage that's too low, suggesting a problem in the circuit or sensor itself.
What the computer is actually seeing
The vehicle's computer (ECM/BCM) sees the brake pressure sensor voltage drop below 0.2 volts when it should be around 0.5-4.5 volts under normal conditions.
What a healthy reading looks like
Brake pressure sensor should typically output between 0.5 to 4.5 volts depending on brake pressure.
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; ensure it's above the minimum mark. If low, refill and retest.
- 22. Inspect the wiring and connectors to the brake pressure sensor for damage, corrosion, or loose connections.
- 33. Use a multimeter to measure the voltage at the brake pressure sensor connector while someone presses the brake pedal. It should read between 0.5-4.5 volts in proportion to how hard the brake is pressed.
- 44. If voltage is low, replace the brake pressure sensor; if voltage reads correctly, suspect a wiring issue or ECM fault.
Common causes
- Faulty brake pressure sensor
- Wiring issues between the sensor and the ECM
- Corroded or loose connector terminals
- Low brake fluid level
- Faulty brake booster operation
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive the vehicle with this code?
It's best to repair this soon, as it could affect your braking performance.
Will this problem come back after clearing the code?
If the issue isn't fixed (like a bad sensor or wiring), the code will likely return.
Why does this code show up with other brake-related codes?
It's common for multiple brake system faults to occur due to shared components or wiring.
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