Accelerator Pedal Position Sensor Fault
This code indicates a problem with the accelerator pedal position sensor or its 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 vehicle's computer can't correctly read how far you're pushing the gas pedal, which affects acceleration and can put you in limp mode.
What the computer is actually seeing
The engine control module (ECM) expects a voltage range from the pedal position sensor between 0.5 volts (idle) and 4.5 volts (full throttle).
What a healthy reading looks like
Normal voltage at the pedal position sensor should range from 0.5V (0% throttle) to 4.5V (100% throttle).
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 any obvious issues with wiring or connectors between the accelerator pedal sensor and the ECM. Look for frayed wires, poor connections, or corrosion.
- 2Using a multimeter, measure the voltage at the accelerator pedal position sensor while slowly moving the pedal. Confirm it varies smoothly between 0.5V and 4.5V.
- 3If the voltages are not within range, replace the accelerator pedal position sensor and retest the voltage.
- 4If the sensor checks out, inspect the related wiring and connectors for continuity and integrity. Repair or replace as needed.
- 5If all else checks out and the problem persists, verify the ECM for fault but ensure you have ruled out all sensor issues first.
Common causes
- Faulty accelerator pedal position sensor
- Damaged wiring or connectors in the sensor circuit
- Corrosion or loose connections at the pedal sensor
- Faulty ECM (rare)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it can cause limited acceleration and unpredictable throttle response. Drive only if necessary and get it fixed as soon as possible.
Will this code come back after a reset?
It may return if the underlying issue is not resolved, particularly if the sensor or wiring is faulty.
Why does this code pair with P2135?
P2135 relates to a potential issue in the wiring or the sensor itself—it's common to see them together because they originate from the same system.
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 →