Accelerator Pedal Position Sensor A Circuit
This code indicates an issue with the accelerator pedal position sensor circuit.
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 detects how far you press the gas pedal and sends that info to the engine computer. If there's a problem, the computer doesn't know how much power you want, which can cause performance issues.
What the computer is actually seeing
The engine control module looks for a voltage signal between 0.5V to 4.5V from the accelerator pedal position sensor corresponding to pedal position. If voltage is out of range or if there's a malfunction, it triggers the fault code.
What a healthy reading looks like
0.5V - 0.9V (pedal at rest), 1.0V - 4.5V (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.
- 1Check for loose or damaged wiring and connectors at the accelerator pedal position sensor.
- 2Test the accelerator pedal position sensor with a multimeter: you should see a smooth voltage increase from 0.5V (pedal up) to 4.5V (pedal down).
- 3Inspect the engine control module for fault and ensure connections are secure. Clear the code and drive the vehicle to see if it returns.
Common causes
- Faulty accelerator pedal position sensor
- Wiring issues in the pedal circuit
- Poor electrical connections at the sensor or connector
- Short or open circuit in the pedal position signal wiring
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this soon, as it can lead to unexpected power loss.
Will the code come back after I reset it?
If the underlying issue is not fixed, yes, the code is likely to return.
Why does this code sometimes pair with SPN 3005?
SPN 3005 often indicates a problem with the throttle position, which is closely related to accelerator pedal reading.
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 →