Accelerator Pedal Position Sensor 1 Performance
The accelerator pedal position sensor is signaling an incorrect position to the ECM.
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 computer is getting a weird signal from the accelerator pedal sensor, meaning it doesn’t know how much you’re pressing the pedal.
What the computer is actually seeing
The ECM expects a specific voltage range from the accelerator pedal sensor (usually 0.5V to 4.5V), corresponding to the pedal's position from fully released to fully pressed. If it sees voltages outside of this range or inconsistent readings, it sets this code.
What a healthy reading looks like
0.5V at fully released pedal and 4.5V at fully pressed pedal; mid-range values should be linear.
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 wiring and connectors for the accelerator pedal position sensor for damage or corrosion. Repair as needed. Check for proper connection.
- 22. Measure the voltage at the accelerator pedal position sensor connector with the pedal released (should be around 0.5V) and fully pressed (should be around 4.5V). If out of range, proceed to step 3.
- 33. Replace the accelerator pedal position sensor if the voltages are incorrect and wiring is good. Clear the code and test vehicle operation.
- 44. If voltages are correct, check for ECM updates or reflashes. Follow the manufacturer's procedure.
Common causes
- Faulty accelerator pedal position sensor
- Corroded or damaged wiring or connectors
- ECM calibration error
- Software issue in the ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate, so it might drive but performance will likely be poor and you could lose acceleration.
Will this code come back after I've fixed it?
If the underlying issue is resolved, the code should not return.
Why does this code appear with other SPN codes?
Multiple codes can occur if the sensor issues affect other systems or if the communication with the ECM is compromised.
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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