Accelerator Pedal Position Sensor 1 - Voltage Too High
The accelerator pedal position sensor signal is higher than expected.
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 computer measures the position of the accelerator pedal to adjust engine power. If the sensor sends a voltage above the normal range, it indicates that the pedal might be pressed too far, or there's a problem with the sensor itself.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage between 0.5V (pedal fully released) and 4.5V (pedal fully pressed). If the sensor voltage exceeds 4.5V, it sets this code.
What a healthy reading looks like
0.5V (pedal released) to 4.5V (pedal 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. Inspect the accelerator pedal and linkage for any mechanical obstructions or sticking. Decision: If obstruction found, repair it and retest. If no obstruction, proceed to step 2.
- 22. Check the wiring and connectors between the accelerator pedal position sensor and the ECM for damage or corrosion. Decision: If you find any issues, repair or replace the wiring/connector. If not, proceed to step 3.
- 33. Use a scan tool to monitor the voltage at the accelerator pedal position sensor with the key on, engine off. Decision: If voltage is above 4.5V, replace the accelerator pedal position sensor. If voltage is within range, the issue may be the ECM.
Common causes
- Faulty accelerator pedal position sensor
- Shorted wiring or connector issues
- ECM calibration issue
- Mechanical sticking in the pedal assembly
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to address this code soon since it can affect acceleration control.
Will the code come back after clearing?
If the underlying issue isn't fixed, the code is likely to return.
Why does this code sometimes appear with SPN 58?
SPN 58 relates to the sensor 2, so if one sensor 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.
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