Redundant Accelerator Pedal Position Sensors Not Matching
The accelerator pedal position sensors are giving conflicting readings.
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)
You've got two sensors on the accelerator pedal, and they should give similar readings. When they don't match, it raises a flag.
What the computer is actually seeing
The ECM is reading two signals: one from the primary and one from the redundant accelerator pedal position sensor. If they differ by more than 0.5 volts when pressed at the same position, it'll throw this code.
What a healthy reading looks like
Both sensors should read within 0.5 volts of each other when the pedal is at the same position. Fully pressed, they should be close to 4.5 volts; fully released around 0.5 volts.
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 connector for any signs of damage or corrosion. If found, repair/replace it and recheck.
- 22. Measure the voltage of both accelerator pedal position sensors at idle. Confirm both should be around 0.5V in the released position. If one is out of spec, replace that sensor.
- 33. While pressing the pedal, measure the voltage again. Both should approach 4.5V. If they don’t match within the expected values (within 0.5V), inspect wiring for damage/fault.
- 44. If both sensors appear to be working correctly, perform an OBD-II scan tool reset and check if the code reappears.
Common causes
- Faulty accelerator pedal position sensor
- Wiring issue between the pedal and ECM
- Faulty ECM
- Bad connector or corroded pins
Typical repair cost
$$ (200-600)
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's better to fix it soon. While it may drive, inconsistent accelerator readings can lead to unintended acceleration issues.
Will this problem come back after being reset?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code relate to both sensors?
The system relies on redundancy for safety; if both sensors disagree, the ECM can't accurately determine how much throttle to apply.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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