P2135 code meaning
Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
Powertrain system Generic code P21xx codes Check engine light
What P2135 means
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.
P2135 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2135
- Engine warning lamp or wrench lamp on
- Reduced engine power, limited throttle opening
- Rough or raised idle
Common causes of P2135
- Most likelyWorn or contaminated position tracks in the throttle body
- Most likelyRaised contact resistance or corrosion at the throttle connector
- PossibleECM calibration prone to false detection (update available on some models)
- Less likelyFault on the shared 5 V reference or ground of both tracks
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Throttle position sensorThrottle body
What each part of P2135 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 35 | The exact fault in that area. |
What to do next
- Note P2135 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2135
What does P2135 mean?
P2135 means "Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation". P2135 compares the two position tracks of the electronic throttle, A and B, and sets when they no longer describe the same plate angle. It is a generic code, so it means the same on every make.
Is it safe to drive with P2135?
Drive gently and only to a workshop. With P2135 the car can go into limp mode (reduced power) to protect itself.
Will P2135 fail an emissions test?
Yes, it can. P2135 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2135 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2135 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.