Brake Pedal Position Sensor Voltage Out of Range
The brake pedal position sensor voltage is outside the expected 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 sensor measures how far down you push the brake pedal. If that measurement is too high or low when you brake, it throws a code.
What the computer is actually seeing
The engine control module (ECM) expects the brake pedal position sensor to signal a voltage between 0.5V and 4.5V when the pedal is pressed or released. If the voltage is below 0.5V or above 4.5V, it triggers the code.
What a healthy reading looks like
Voltage from the brake pedal position sensor should be between 0.5V (pedal up) and 4.5V (pedal down).
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 to the brake pedal position sensor. Look for damage or corrosion. If you find issues, repair or replace as needed. Decision: Is there visible damage? If yes, fix it and retest. If no, move to step 2.
- 22. Check the voltage at the brake pedal position sensor connector with a multimeter while someone presses the brake pedal. You expect between 0.5V and 4.5V. Decision: Is the voltage within range? If yes, the sensor is likely good, check further downstream. If no, replace the sensor and retest.
- 33. Verify the power supply to the sensor. Check for any blown fuses or bad connections to power and ground. Decision: Is the power supply good? If yes, go to step 4. If no, repair the power issue and retest.
- 44. If the sensor and wiring check out, scan for any related codes that might indicate a system issue or another fault affecting the brake system. If additional codes are present, follow the diagnostic for those codes.
Common causes
- Faulty brake pedal position sensor
- Corroded or damaged wiring
- Loose or bad connector
- Faulty brake switch
- Insufficient power supply to the sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive but you may experience erratic brake behavior or loss of certain features like cruise control.
Will this code come back?
If the underlying issue isn't fixed, it likely will return after clearing.
Why does this code sometimes pair with SPN 2721?
SPN 2721 can indicate a problem with the brake switch which often fails in conjunction with the position sensor.
Working a real vehicle right now?
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