Accelerator Pedal Position Sensor 1
Accelerator pedal position sensor signal is out of range.
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What it means (plain English)
The computer checks the accelerator pedal position sensor and sees a signal that doesn't make sense, meaning the pedal might be stuck or the sensor is faulty.
What the computer is actually seeing
The computer expects to see an analog voltage between 0.5V and 4.5V from the accelerator pedal sensor as you press down. If it sees values outside this range, it triggers the fault.
What a healthy reading looks like
Expected voltage from the accelerator pedal position sensor should range from 0.5V at idle to 4.5V at full 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 the wiring and connectors at the accelerator pedal position sensor for damage or corrosion. Repair as needed.
- 2Using a multimeter, measure the voltage at the sensor connector with the key on and the pedal at idle. It should read around 0.5V. If not, proceed to step 3.
- 3Press the accelerator pedal slowly to the floor while monitoring the voltage. It should steadily increase up to 4.5V. If it does not match expected values, replace the sensor.
- 4If the sensor appears to be functioning correctly, inspect the ECM for any faults and check for software updates.
Common causes
- Faulty accelerator pedal position sensor
- Wiring or connector issues
- ECM/software faults
- Mechanical issues with the accelerator pedal assembly
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive if the accelerator is not responding correctly, as it could lead to sudden loss of power or control.
Will this code come back after clearing?
Yes, if the underlying issue isn't resolved, it will re-trigger after clearing.
Why do I see this code with a transmission problem?
This code can affect throttle response, which in turn affects how the transmission shifts.
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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