Accelerator Pedal Position Sensor 1
The accelerator pedal position sensor signal is out of range.
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 accelerator pedal position sensor measures how far you push the gas pedal. If the signal is too low or too high, the engine control unit (ECU) doesn’t know how much power you want.
What the computer is actually seeing
The ECU expects the accelerator pedal position sensor (APPS) to send a voltage signal between 0.5V to 4.5V. If the signal is outside of this range, it triggers the fault code.
What a healthy reading looks like
0.5V (idle) to 4.5V (full throttle) for the pedal position signal, with a boundary of +/- 0.2V for the sensor's expected range.
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 position sensor wiring for damage or corrosion. Repair any issues found. Decision: Is wiring okay? (Yes/No)
- 22. Inspect the connector to the accelerator pedal position sensor for loose pins. Ensure it's seated properly. Decision: Are all connections tight? (Yes/No)
- 33. Measure the voltage output of the accelerator pedal position sensor when the pedal is at rest and pressed fully. Expect 0.5V to 4.5V. Decision: Is the voltage within range? (Yes/No)
- 44. If voltage is out of range, test with a new or confirmed working accelerator pedal position sensor. Decision: Does the new sensor provide correct voltage? (Yes/No)
- 55. If the issue persists with a new sensor, perform a diagnostic scan on the ECU for any further error messages.
Common causes
- Faulty accelerator pedal position sensor
- Bad wiring or connectors in the throttle system
- ECU calibration issue
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, the vehicle may enter limp mode, leading to reduced power and acceleration.
Will the code come back after clearing?
It can come back if the underlying issue isn’t fixed, such as a faulty sensor or wiring.
Why does it pair with SPN 3361?
SPN 3361 is often triggered when the ECU detects inconsistent readings between multiple pedal position sensors.
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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