Accelerator Pedal Position Sensor Voltage
Accelerator pedal position sensor voltage 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 sensor that tells the engine how far you're pressing the gas pedal isn't sending the right signal to the computer, usually because of a wiring issue or a bad sensor.
What the computer is actually seeing
The computer expects a voltage between 0.5V (pedal at rest) and 4.5V (pedal fully pressed).
What a healthy reading looks like
0.5V to 4.5V for normal operation; out of range indicates a fault.
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 accelerator pedal position sensor wiring and connectors for damage or corrosion. Decision: Is wiring and connectors intact? (Yes: go to step 2, No: repair wiring/replace connectors)
- 22. Check the accelerator pedal position sensor resistance with a multimeter. Expected resistance at rest < 1 ohm; fully pressed 4.5k ohm. Decision: Is resistance within specs? (Yes: go to step 3, No: replace the sensor)
- 33. Verify power and ground at the sensor. Power check should be battery voltage (10-14V). Decision: Is power and ground good? (Yes: go to step 4, No: repair power/ground issue)
- 44. Clear the fault code and test drive the vehicle for a recalibration of sensor signal. Decision: Does the code return? (Yes: replace sensor, No: complete)
Common causes
- Faulty accelerator pedal position sensor
- Damaged wiring or connectors
- Poor ground connection
- Corrosion at connectors
- Intermittent faults due to vibration
Typical repair cost
$120 - $300
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but performance may be affected, so fix soon.
Will the code come back after repairs?
If the issue is fixed correctly, it should not return.
Why does this code pair with SPN 475?
Both codes relate to throttle control and accelerator position signals.
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 →