Accelerator Pedal Position Sensor 1
The accelerator pedal position sensor is reading outside of its expected 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)
Your truck's accelerator pedal sensor is telling the engine computer that the pedal position is off, so it can't adjust power correctly.
What the computer is actually seeing
The engine control unit sees a voltage drop or rise from the sensor that doesn't match the expected range, typically around 0.5 volts at rest and up to 4.5 volts at full throttle.
What a healthy reading looks like
Expected voltage at idle should be around 0.5V and at full throttle around 4.5V with a linear response.
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 connectors to the accelerator pedal position sensor for damage or corrosion. Ensure the connections are clean and secure. Proceed to step 2 if everything looks good.
- 22. Measure the voltage at the accelerator pedal position sensor while ensuring the key is on but the engine is off. You should see a reading close to 0.5V at rest. If not, replace the sensor. If voltage is good, move to step 3.
- 33. With the engine running, press the accelerator pedal to the floor and observe the voltage at the sensor should read up to 4.5V. If it doesn't reach this value, replace the sensor. If readings are normal, check for faults in the engine control unit. If a fault exists, proceed to step 4.
- 44. If you've confirmed the sensor and wiring are okay, check the engine control unit for proper function and for stored codes. Repair or replace the ECU as necessary.
Common causes
- Faulty accelerator pedal position sensor
- Wiring issues (chafed, broken, or corroded wires)
- Bad connector at the sensor or ECU
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's not recommended to drive as engine responsiveness may be impaired, leading to potential safety issues.
Will this code come back after clearance?
If underlying issues aren’t resolved, the code is likely to reappear, especially during acceleration.
Why does this code sometimes pair with other codes?
It often pairs with other codes related to throttle and pedal position, indicating possibly systemic issues in the throttle control system.
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