Accelerator Pedal Position Sensor 1
The accelerator pedal position sensor signal is out of 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 sensor that measures how far you press the gas pedal is sending a value that's either too high or too low for the engine to understand, which can affect acceleration.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage from the accelerator pedal position sensor that corresponds to the pedal position, typically between 0.5V (pedal released) and 4.5V (pedal fully pressed).
What a healthy reading looks like
0.5V to 4.5V at the accelerator pedal position sensor.
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 for the accelerator pedal position sensor for damage, corrosion, or loose connections. Are they intact?
- 22. With the key in the ON position (engine off), use a multimeter to check the voltage output from the accelerator pedal position sensor. Is it between 0.5V and 4.5V?
- 33. If the voltage is out of range, check the resistance of the pedal sensor and the continuity of the wiring to the ECM. Are there any shorts or opens?
- 44. If wiring and sensor check out, inspect the pedal assembly for any mechanical issues like binding, broken springs, or foreign objects. Is everything functioning smoothly?
- 55. If all previous checks are good, consider swapping the accelerator pedal position sensor with a known good one. Does the code return?
Common causes
- Faulty accelerator pedal position sensor
- Wiring issue (short or open circuit)
- Corroded or loose connectors
- Faulty engine control module (ECM)
- Mechanical binding in the pedal assembly
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It might drive but with reduced power and could stall; address it soon.
Will the code come back after clearing it?
Yes, if the underlying issue isn't fixed, it will return.
Why does this code pair with other codes?
Other codes may indicate related sensor issues in the throttle or engine management system.
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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