Accelerator Pedal Position Sensor 1
Indicates an issue with the accelerator 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 accelerator pedal position sensor tells the computer how far down the gas pedal is pushed. If the signal from this sensor is wrong or missing, the engine control module (ECM) can't adjust the throttle properly.
What the computer is actually seeing
The ECM expects a voltage signal from the accelerator pedal position sensor between 0.5V and 4.5V, depending on pedal position. A fault might show voltages below 0.4V or above 4.6V, or even a complete loss of signal.
What a healthy reading looks like
0.5V at rest (pedal fully released), 4.5V at full throttle (pedal fully 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.
- 11. Check the accelerator pedal for physical obstructions or binding. Move it slowly to ensure it returns to rest without sticking.
- 22. Inspect the wiring and connectors related to the accelerator pedal position sensor. Look for frays, breaks, or corrosion.
- 33. With the ignition on, use a multimeter to measure the voltage at the accelerator pedal position sensor connector. Expect 0.5V to 4.5V depending on where the pedal is positioned.
- 44. If voltage is out of range, replace the accelerator pedal position sensor. If voltage is normal, check the ECM for faults.
Common causes
- Faulty accelerator pedal position sensor
- Damaged wiring or connectors
- Dirty or corroded connections
- Faults in the ECM software
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's best to repair soon to avoid drivability issues, especially when accelerating.
Will the code come back after clearing?
If the underlying issue isn't fixed, yes, it'll come back.
Why is this linked to other codes?
These codes indicate related issues in the accelerator pedal system; one failure can affect multiple components.
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