Brake Pedal Position Sensor 1 Voltage Above Normal
Indicates an abnormal voltage reading from the brake pedal position sensor 1.
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 module (ECM) how far the brake pedal is pressed. If it's sending a voltage over its normal range (usually 0.5 to 4.5 volts), the ECM thinks something's wrong, which can cause issues with things like cruise control and electronic stability control.
What the computer is actually seeing
The ECM expects a voltage output from the brake pedal position sensor that varies from 0.5V (pedal released) to around 4.5V (pedal fully pressed). If the sensor is over about 4.5V, it triggers this fault.
What a healthy reading looks like
Brake pedal position sensor output should be between 0.5V and 4.5V; if over 4.5V, a fault will trigger.
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.
- 1Inspect the brake pedal position sensor wiring for damage or loose connections. Check the connector for corrosion or bent pins.
- 2With the key on, engine off, use a multimeter to measure the voltage at the brake pedal position sensor output. Verify it is below 4.5V when the pedal is fully pressed.
- 3If the voltage is above 4.5V, replace the brake pedal position sensor and clear codes. If the voltage is normal, check for shorts or other wiring faults between the sensor and ECM.
- 4If faults persist after sensor replacement, evaluate the ECM for proper function or reprogramming needs.
Common causes
- Faulty brake pedal position sensor
- Poor electrical connections
- Wiring issues (shorts to ground or power)
- Faulty ECM or programming issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's moderate severity; you can drive, but issues with braking systems like cruise control may occur, so fix soon.
Will this fault code come back after I clear it?
It may return if there are underlying wiring issues or if the sensor is faulty.
Why does this code pair with SPN 4383?
SPN 4383 indicates an issue with the brake pedal switch, which often fails alongside the position sensor.
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