Accelerator Pedal Position Sensor 2","shortDescription":"Accelerator pedal position sensor 2 has an issue.
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 has two sensors, and sensor 2 is giving readings that don't match what the computer expects.
What the computer is actually seeing
The ECM expects the pedal position from Sensor 2 to be between 0.5V (at rest) and 4.5V (fully pressed) and compares it to Sensor 1.
What a healthy reading looks like
Sensor 2 should output a voltage signal that is approximately linear to the pedal position—0.5V to 4.5V—depending on the vehicle, with readings that vary within 0.5V of Sensor 1.
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 to the accelerator pedal position sensor 2 for damage or corrosion. If damage is found, repair or replace the wiring. Decision: Is wiring intact? Yes: Proceed to step 2. No: Repair wiring.
Common causes
- Bad accelerator pedal position sensor 2
- Wiring issues in the throttle position sensor circuit
- Poor connection at the accelerator pedal connector
- ECM programming error or malfunction
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but could lead to unresponsive throttle issues; fix soon.
Will this problem come back after clearing the code?
It can if the underlying issue isn't resolved.
Why did this code appear alongside SPN 844?
SPN 844 relates to Sensor 1; if both codes are present, there's likely an issue with the accelerator pedal system.
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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