Accelerator Pedal Position Sensor 1 Fault
There’s a problem with the accelerator pedal position sensor.
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 engine computer how far you’ve pushed the accelerator. If it fails or sends the wrong signals, the computer can’t tell how much power you want, which can affect acceleration and overall engine performance.
What the computer is actually seeing
The engine control unit (ECU) receives a voltage signal from the accelerator pedal position sensor, which should change proportionally as the pedal is pressed. Faulty signals may lead to irregular voltage patterns.
What a healthy reading looks like
Expected voltage range from the accelerator pedal position sensor is typically 0.5V (pedal at rest) to about 4.5V (pedal fully depressed).
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 of the accelerator pedal position sensor for any visible damage or corrosion. If damaged, repair or replace the wiring/connectors. Decision: If repaired, clear codes and test drive. If not damaged, proceed to step 2.
- 22. Use a multimeter to check the voltage output of the accelerator pedal position sensor at rest and during operation. Expected values should range from 0.5V to 4.5V. Decision: If voltage is out of spec, replace the sensor. If within spec, proceed to step 3.
- 33. Check for additional codes in the ECM that could indicate related issues. Document any findings. Decision: If there are codes related to the ECM or other sensors, address those first. If no additional codes, replace the accelerator pedal position sensor.
Common causes
- Faulty accelerator pedal position sensor
- Damaged wiring or connectors to the sensor
- ECM (Engine Control Module) issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so while you can drive, you may experience hesitation or poor acceleration. It's best to repair soon.
Will this issue come back after repair?
If you fix the underlying problem, like replacing a faulty sensor or repairing wiring, it shouldn't come back.
Why does this code pair with SPN 1564/1565?
These codes relate to other possible faults within the accelerator system, indicating there may be more than one issue affecting throttle response.
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