Brake Pedal Position (BPP) Sensor Input Failure
The brake pedal position sensor signal is out of expected range or missing.
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 pressed, which is used for vehicle safety and operation. If there's a failure, the system can't tell if you’re braking or not.
What the computer is actually seeing
The computer expects a voltage signal from the sensor that varies between 0.5V (no brake applied) to 4.5V (full brake applied). Failure occurs when the signal is below 0.3V or above 4.7V, or if the signal is completely absent.
What a healthy reading looks like
Expected voltage for the BPP sensor should vary smoothly between 0.5V to 4.5V under normal operation.
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 connector for the brake pedal position sensor. Look for frayed wires or corrosion.
- 22. Measure the voltage at the brake pedal position sensor connector. With the key on and the pedal up, you should read around 0.5V; with the pedal fully pressed, it should be close to 4.5V. If not, replace the sensor.
- 33. If the sensor voltage is good but the code persists, look for shorts in the wiring harness or check the ground connections to the ECM.
- 44. If you find no issues, test the ECM to ensure it is receiving and processing the sensor signal correctly.
Common causes
- Failed brake pedal position sensor
- Wiring issues (shorts, opens, or corrosion)
- Faulty connector or loose connection
- Electrical interference from other components
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity indicates it's best to fix it soon, as it affects braking functionality.
Will this issue come back after clearing the code?
If the underlying problem isn't fixed, such as a bad sensor or wiring issue, the code will likely return.
Why does this code show up with SPN 5246 or SPN 5247?
These codes indicate related sensor issues and can occur together if there are common wiring faults or multiple sensor failures.
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