Brake Pedal Position Sensor Circuit Voltage Low
The brake pedal position sensor is sending a low voltage signal to the engine control module.
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What it means (plain English)
The brake pedal position sensor is supposed to send a voltage signal to the engine control module that reflects how far down the brake pedal is pressed. If it's too low, the system thinks there's an issue with the brake being applied properly, which affects things like engine performance and safety.
What the computer is actually seeing
The engine control module expects to see a voltage between 0.5V to 4.5V from the brake pedal position sensor. If the voltage falls below about 0.5V, it triggers this fault code.
What a healthy reading looks like
0.5V to 4.5V
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. Inspect the wiring and connectors for the brake pedal position sensor. Look for frays, corrosion, or disconnections. Decision: Are the connections secure and undamaged?
- 22. Check the brake pedal position sensor signal voltage using a multimeter, with the key on and the pedal in various positions. Expected voltage is between 0.5V and 4.5V. Decision: Is the voltage within the expected range?
- 33. If the signal voltage is low, replace the brake pedal position sensor. Decision: Did replacing the sensor clear the code?
- 44. If voltage is good, inspect for any faults in the wiring or connectors. Check for continuity and ground issues. Decision: Are there any wiring issues found?
Common causes
- Faulty brake pedal position sensor
- Damaged wiring or connectors in the sensor circuit
- Poor ground connection or battery voltage issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately severe, so while the vehicle may still drive, it can affect braking performance and should be fixed soon.
Will the code come back after clearing?
If the underlying issue isn't fixed, it will likely return.
Why does this code affect other systems?
The brake pedal position sensor affects not just engine performance but also safety features related to braking.
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