Brake Pedal Position Sensor Failure
Indicates a fault with the brake pedal position sensor signal.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The brake pedal position sensor tells the computer how far down the brake pedal is pushed. If it fails, the computer won’t know if you’re trying to stop the vehicle.
What the computer is actually seeing
The brake pedal position sensor outputs a voltage signal based on the position of the brake pedal. Typically, the voltage should range from 0.5 volts (pedal not pushed) to 4.5 volts (pedal fully depressed).
What a healthy reading looks like
Expected voltage output from the brake pedal position sensor should be between 0.5V and 4.5V based on pedal position.
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 wiring and connector for the brake pedal position sensor. Look for signs of damage, fraying, or corrosion.
- 22. Use a multimeter to measure the voltage at the brake pedal position sensor while operating the brake pedal. It should range from 0.5V to 4.5V.
- 33. If the voltage is outside this range, check for continuity of the wiring back to the ECM (Electronic Control Module) and repair as needed.
- 44. If wiring is good and the sensor outputs incorrect voltage, replace the brake pedal position sensor and retest.
- 55. Clear the fault codes and take the vehicle for a test drive to confirm that the code does not return.
Common causes
- Damaged brake pedal position sensor
- Wiring issues or shorts in the sensor circuit
- Corrosion or poor connections at the connector
- Faulty brake switch that affects sensor output
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It is generally safe to drive as long as the brake lights operate normally, but it’s best to fix this code soon to avoid braking issues.
Will this code come back after reset?
If the sensor is faulty or wiring issues exist, the code will likely return after clearing and driving.
Why does this code sometimes pair with SPN 533?
SPN 533 indicates a fault with the brake switch, and both can arise from similar wiring issues or faults in the brake system.
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