Accelerator Pedal Position Input A

This code means the engine computer isn’t seeing the right signals from the accelerator pedal sensor, which tells how much gas you want to use. When you press the pedal, the sensor should send a voltage between 0.5 to 4.5 volts; anything that's out of this range is trouble.

The Engine Control Module (ECM) expects a linear increase in voltage from the accelerator pedal position sensor, typically 0.5V at idle and up to 4.5V at full throttle. If the actual voltage is outside this range or fluctuating, it sets the SPN 5488 code.

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.

1. 11. Inspect the accelerator pedal position sensor wiring for visible damage or corrosion. If damaged, repair or replace the wiring.
2. 22. Check the connector at the accelerator pedal sensor for proper fit and corrosion. Clean or replace the connector as necessary.
3. 33. Using a multimeter, measure the voltage at the accelerator pedal sensor. With the pedal released, you should see about 0.5V; at full throttle, it should rise to about 4.5V. If not, replace the sensor.
4. 44. If the sensor is functioning correctly, use a scan tool to check for ECM updates or faults. If all else fails, suspect a faulty ECM.

• Faulty accelerator pedal position sensor
• Wiring issues (corrosion, shorts)
• ECM malfunction
• Poor connector contact

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