Accelerator Pedal Position Sensor 2 Circuit Low
The accelerator pedal position sensor 2 signal is too low.
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 weak signal from the accelerator pedal sensor 2, which tells it how far you're pressing the gas pedal.
What the computer is actually seeing
The engine control module expects the accelerator pedal position sensor 2 signal to be between 0.5 volts (minimum) and 4.5 volts (maximum). If the signal drops below 0.5 volts, it triggers this code.
What a healthy reading looks like
Expected voltage range from accelerator pedal position sensor 2 is 0.5V to 4.5V; ideally around 1.0V to 2.0V at idle and 4.0V to 4.5V at full throttle.
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 for the accelerator pedal position sensor 2 for damage, corrosion, or loose connections. If found, repair or replace as needed.
- 22. Measure the voltage at the accelerator pedal position sensor 2 connector key-on-engine-off. Is the voltage below 0.5V? Yes - go to step 3; No - replace the sensor.
- 33. With the engine running, measure the voltage again at the same connector. Is it fluctuating or staying low? Yes - replace the accelerator pedal position sensor 2; No - check the ECU for faults.
Common causes
- Faulty accelerator pedal position sensor 2
- Wiring issues (chafing, broken wires)
- Loose or corroded connectors
- ECU software issue
- Throttle body issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
You can drive but with reduced throttle response; get it checked soon to avoid further issues.
Why does this code pair with SPN 1827?
Both involve accelerator pedal position sensors, indicating issues with throttle response.
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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