Accelerator Pedal Position Sensor 1 Circuit Voltage Above Normal
The accelerator pedal position sensor is reporting a voltage that is too high.
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 accelerator pedal has a sensor that tells the engine how far down the pedal is pushed. When you push down, the sensor should send a voltage level that increases; if it sends more than what is expected, the computer thinks there's a problem.
What the computer is actually seeing
The Engine Control Module (ECM) is expecting the accelerator pedal position sensor signal to vary between 0.5 volts (at idle) to about 4.5 volts (at full throttle). If the voltage stays above 4.5 volts for a certain period, this code triggers.
What a healthy reading looks like
Expected voltage range is approximately 0.5 to 4.5 volts 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. Inspect the accelerator pedal position sensor connector for corrosion or damage. If damaged, repair or replace. Decision: If connector is good, proceed to step 2.
- 22. Check the wiring between the accelerator pedal sensor and the ECM for any visible damage or shorts. Use a multimeter to check continuity. Decision: If wiring is intact, go to step 3.
- 33. With the key on (engine off), use a multimeter to measure the output voltage of the accelerator pedal position sensor. It should be between 0.5 and 4.5 volts. Decision: If voltage is above this range, replace the accelerator pedal position sensor; if within this range, consider ECM issues.
Common causes
- Faulty accelerator pedal position sensor
- Short circuit in wire harness
- Corrosion or poor connections in the wiring
- Faulty ECM causing wrong readings
- Mechanical binding in the accelerator pedal mechanism
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive with this code active?
Yes, but expect a lack of power and increased emissions until repaired.
Will this code come back after clearing it?
It can return if the underlying issue isn't fixed, especially if it’s a sensor fault.
Why does this code show up with SPN 0606?
SPN 0606 is the second sensor related to accelerator pedal position; if one fails, the other often does too.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →