Accelerator Pedal Position Sensor 2 - Voltage/Signal Invalid
The accelerator pedal position sensor 2 is sending a faulty signal.
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 second sensor that measures how much you're pressing the gas pedal isn't working right, which affects how the engine responds.
What the computer is actually seeing
The ECM sees a voltage signal outside the expected range when the accelerator pedal is pressed, usually below 0.5V or above 4.5V when it should be around 1V at idle and 4V at full acceleration.
What a healthy reading looks like
Expected voltage should be between 0.5V (idle) and 4.5V (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 accelerator pedal position sensor 2 wiring for frays or damage. Repair as needed. Decision: If wiring is good, proceed to next step.
- 2Inspect the connector for corrosion or loose pins. Clean or secure the connector if necessary. Decision: If connector is good, proceed to next step.
- 3Test the voltage at the accelerator pedal position sensor 2. You should get a reading between 0.5V (idle) and 4.5V (full throttle). If readings are out of range, replace sensor. Decision: If readings are normal, continue to next step.
- 4Compare the signal from accelerator pedal position sensor 2 with the main accelerator pedal position sensor. If there's a significant discrepancy, replace the faulty sensor.
Common causes
- Bad accelerator pedal position sensor 2
- Wiring issues (frays or shorts)
- Corroded connectors
- Issues with the main accelerator pedal sensor affecting the signal
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
Moderate severity means you should fix this soon, as drivability may be impacted.
Will this problem come back after repairs?
If you fix the sensor and ensure wiring/connectors are good, it should not return unless there is another underlying issue.
Why does this code pair with others like SPN 5127?
They both relate to the accelerator pedal system; one problem can cause multiple codes.
Working a real vehicle right now?
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