Brake Pedal Position Sensor
Brake pedal position sensor signal is out of range.
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 engine control unit how far down the brake pedal is pressed, usually sending a signal between 0 and 5 volts. If the signal goes below 0.1 volts or above 4.9 volts, this error code pops up in the system.
What the computer is actually seeing
The engine control module expects a voltage between 0.1V and 4.9V from the brake pedal position sensor when the pedal is pressed. Values outside this range will trigger the fault code.
What a healthy reading looks like
0.1V (pedal released) - 4.9V (pedal fully depressed)
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 wiring and connectors to the brake pedal position sensor for damage or corrosion.
- 22. Measure the voltage at the brake pedal position sensor connector with the key on (engine off). Expected value should be 0.1V to 4.9V. If out of this range, proceed to step 3.
- 33. Inspect the brake pedal assembly for mechanical binding or obstruction. Fix any issues.
- 44. If wiring is good and pedal is clear, replace the brake pedal position sensor.
- 55. Clear the fault code and test drive the vehicle to see if the code comes back.
Common causes
- Wiring issues or bad connectors between the brake pedal position sensor and the ECM.
- Faulty brake pedal position sensor.
- Mechanical obstruction preventing the pedal from fully returning to its rest position.
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this code soon; while you can drive, the vehicle might not behave predictably when braking.
Will this code come back after I clear it?
It may come back if the underlying issue is not resolved. Confirm all checks before clearing.
Why do I see this code with SPN 1291?
SPN 1291 typically relates to an unrelated sensor, but both refer to issues in the brake system; they can appear together.
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