P2135Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2135 compares the two position tracks of the electronic throttle, A and B, and sets when they no longer describe the same plate angle. GM's 2006-2007 tables allow a 7 % offset at closed throttle rising to 10 % at full opening and count failures every 12.5 ms until 19 of 39 have failed. Ford flags more than 7 degrees of disagreement; its 2012 and 2020-2023 summaries show only the wrench lamp, the 2024 summary also the MIL. Mitsubishi lists P2135 for the 2022 Outlander as a one-trip MIL code. Nissan bulletin NTB21-080 cures P2135 on the 2020-2021 Frontier without driveability complaints by ECM reprogramming. Mercedes traced it on AMG M177 V8s to high resistance in the throttle actuator pins. The ECU then limits throttle opening.
- What you may notice
- Engine warning lamp or wrench lamp on
- Reduced engine power, limited throttle opening
- Rough or raised idle
- Likely causes
- LikelyWorn or contaminated position tracks in the throttle body
- LikelyRaised contact resistance or corrosion at the throttle connector
- PossibleECM calibration prone to false detection (update available on some models)
- RareFault on the shared 5 V reference or ground of both tracks
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.