Accelerator Pedal Position Sensor 1 Circuit A
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 computer is not getting the right signal from the accelerator pedal sensor when you press it, which means it can't tell how much power to give the engine.
What the computer is actually seeing
The accelerator pedal position sensor is supposed to send a voltage signal between 0.5V (idle) and 4.5V (full throttle). If it's below 0.5V or above 4.5V, or if there's a drop in voltage while you're pressing the pedal, that's when this code triggers.
What a healthy reading looks like
0.5V at idle; 4.5V at full throttle; smooth transition between these values as you accelerate.
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 wiring and connector at the accelerator pedal position sensor for damage or corrosion. Fix if necessary.
- 22. Use a multimeter to measure the voltage at the accelerator pedal sensor. Expected values are 0.5V at idle and up to 4.5V at full throttle. Is the voltage correct?
- 33. If the voltage is not within specification, replace the accelerator pedal position sensor. If it is, proceed to the next step.
- 44. Check the wiring harness for shorts or opens between the sensor and ECM. Continuity test the wires. Repair as necessary. 'Are there any issues found in the wiring?
- 55. If wiring is good, consider testing or replacing the ECM as a last resort.
Common causes
- Damaged accelerator pedal position sensor
- Wiring issues in the sensor circuit
- Faulty Engine Control Module (ECM)
- Bad throttle body assembly
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity. You might experience reduced acceleration or engine performance, so it's better to fix it soon but not critical.
Will the code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code pair with other SPN codes?
Related codes often indicate issues with the same sensor or circuit; they help pinpoint the root cause.
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 →