Brake Pedal Position Sensor A Circuit Range/Performance Problem
The brake pedal position sensor is reporting a problem with its output 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 measures how far you press the brake pedal and sends this info to the vehicle's computer, but it's giving readings that don’t make sense.
What the computer is actually seeing
The vehicle's computer expects a voltage signal between 0.5V (pedal up) and 4.5V (pedal down). If values are outside this range or fluctuate wildly, it triggers this code.
What a healthy reading looks like
0.5V at rest, 4.5V at full press; readings should change smoothly and proportionately when the pedal is 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.
- 1Check the brake pedal position sensor connector for corrosion or damage.
- 2Measure the voltage at the brake pedal position sensor: should be 0.5V at rest and 4.5V at full press.
- 3Inspect wiring between the sensor and the ECM for shorts or breaks; use a multimeter to check continuity.
- 4If the voltages are incorrect, replace the brake pedal position sensor and retest.
Common causes
- Faulty brake pedal position sensor
- Damaged wiring or connectors
- Faulty brake master cylinder
- Corroded terminals or poor ground connections
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends; you might lose some brake function or experience erratic behavior, fix soon.
Will this issue come back after clearing the code?
If underlying cause isn't fixed, it's likely to return.
Why does this code sometimes pair with codes for ABS?
Both systems use the brake pedal position input; issues can affect multiple modules.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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