Brake Pedal Position Sensor 1
The brake pedal position sensor 1 signal is out of expected range.
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What it means (plain English)
The brake pedal position sensor tells the computer how far you’re pressing the brake. If it sends a signal that’s too low or too high and out of range, the system doesn’t know how to react, which can affect braking performance.
What the computer is actually seeing
The ECM sees unusual voltage signals from the brake pedal sensor, often below 0.3V or above 4.5V.
What a healthy reading looks like
Brake pedal position should typically be between 0.5V (pedal not pressed) and 4.0V (pedal fully pressed).
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 at the recommended mark. If low, fill it and check for leaks.
- 22. Inspect the wiring and connectors to the brake pedal position sensor for signs of damage or corrosion. Repair any found issues.
- 33. Use a multimeter to measure the voltage at the brake pedal position sensor. It should be between 0.5V and 4.0V while pressing the pedal. If it is not, replace the sensor.
- 44. Clear the code and test drive the vehicle. Monitor for reoccurrence of the code.
Common causes
- Faulty brake pedal position sensor
- Wiring issues or broken connectors
- Air leaks in brake system affecting pedal feel
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive my vehicle with this code?
It's best to repair this issue soon, as it may affect braking performance.
Will this problem come back after clearing the code?
If the underlying issue isn’t fixed, the code will likely return.
Why does this code often pair with SPN 2208?
SPN 2208 is related to the service brake switch which also affects the brake system and could compound sensor issues.
Working a real vehicle right now?
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