Accelerator Pedal Position Sensor 1 - Voltage Above Normal
The accelerator pedal position sensor voltage 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 accelerator pedal position sensor is sending a signal that it's pushed down more than it should be, which can lead to unexpected acceleration.
What the computer is actually seeing
The Engine Control Module (ECM) detects a voltage reading from the accelerator pedal position sensor 1 above the normal range, typically over 4.5 volts when the pedal is fully pressed, but it shouldn't exceed this during normal operation.
What a healthy reading looks like
Normal voltage should range from 0.5V (pedal released) to 4.5V (pedal 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.
- 11. Check the accelerator pedal position sensor wiring and connectors for damage or corrosion. If damaged, repair or replace as needed. Decision: If the wiring is good, move to step 2.
- 22. Measure the voltage at the accelerator pedal position sensor with the key on, engine off. Expected values are 0.5V at rest and 4.5V fully pressed. If readings are outside this range, replace the sensor. Decision: If readings are normal, move to step 3.
- 33. Inspect the ECM for proper grounding and any signs of water intrusion or damage. Repair any issues found. Decision: If the ECM appears good, further diagnostics may be needed using a scan tool.
Common causes
- Faulty accelerator pedal position sensor
- Damaged wiring or connectors
- ECM calibration error
- Signal interference from other electronic components
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended. High accelerator readings can lead to unintended acceleration.
Will the code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why is this code paired with other accelerator position codes?
Normally, they indicate different faults in the accelerator pedal sensor circuit.
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 →