Accelerator Pedal Position Sensor 2 Circuit Low
The accelerator pedal position sensor signal is lower than expected.
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What it means (plain English)
Inside the vehicle's computer, there's a sensor that tracks how far you press the accelerator pedal. If it senses too low a voltage (typically below 0.5 volts), it thinks you’re not pushing the pedal at all, which can cause performance issues.
What the computer is actually seeing
The engine control unit (ECU) monitors the accelerator pedal position (APP) sensor 2 voltage and expects it to be within 0.5V to 4.5V. If it sees below 0.5V, it triggers a fault code.
What a healthy reading looks like
The expected voltage from the accelerator pedal position sensor should be between 0.5V and 4.5V depending on the pedal position.
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 the wiring and connector to the accelerator pedal position sensor for damage or corrosion. If found, repair as necessary.
- 22. Check the accelerator pedal position sensor voltage at the connector with the key on (engine off). You should see a voltage between 0.5V to 4.5V. If voltage is below 0.5V, replace the sensor.
- 33. If the signal is normal, check for any shorts or opens in the wiring between the sensor and the ECM. Repair as needed.
- 44. If all wiring and connections are good but the code persists, consider testing or replacing the ECM.
Common causes
- Faulty accelerator pedal position sensor
- Poor electrical connections
- Damaged wiring to the sensor
- Faulty ECM (Engine Control Module)
Typical repair cost
$$ (100-400)
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately serious; it could lead to reduced engine performance, so it's best to fix it soon.
Will this code come back after clearing it?
If the underlying issue isn’t resolved, expect the code to return.
Why is this happening with a problem in the throttle?
The throttle relies on the accelerator pedal position; if the sensor sends wrong signals, it can affect throttle response.
Working a real vehicle right now?
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