Accelerator Pedal Position (APP) Sensor Voltage Range/Performance Problem
This code indicates a problem with the accelerator pedal position sensor.
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 sends a voltage signal to the engine's computer based on how far you push it down. If there's a problem, the computer can’t determine how much you want to accelerate, which can lead to poor performance or stalling.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage signal from the APP sensor that ranges typically from 0.5V (idle) to 4.5V (full throttle). If the voltage is outside expected limits or inconsistent, this code sets.
What a healthy reading looks like
Expected APP voltage values are 0.5V at rest and up to 4.5V at full throttle under normal conditions.
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 APP sensor connectors for corrosion, damage, or loose connections. Repair as needed.
- 2Using a multimeter, measure the voltage at the APP sensor connector. It should be between 0.5V and 4.5V with the pedal at rest and pressed respectively.
- 3If the voltage is out of range, test the wiring harness for shorts or opens. Repair any identified issues before proceeding.
- 4Replace the APP sensor if wiring checks out and voltage is still inconsistent or outside expected values.
- 5If the code persists after replacing the sensor, inspect the ECM and grounds for issues.
Common causes
- Faulty accelerator pedal position sensor
- Damaged wiring or connectors to the APP sensor
- Poor ground connection
- Intermittent electrical faults
- Failing ECM (rare)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best not to drive the vehicle until fixed, as you can lose acceleration suddenly.
Will this code come back after I clear it?
If the underlying issue is not resolved, the code will likely return.
Why does this code pair with SPN 579?
SPN 579 is often related and indicates a problem with the APP sensor circuit that can be an underlying cause of SPN 580.
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