OBD-II code · Powertrain (generic, extended)
P2138 Throttle/Pedal Position Sensor "D"/"E" Voltage Correlation
The two redundant accelerator pedal position sensors disagree by more than the allowed tolerance. The ECU cannot trust either signal and switches to limp-home with very limited torque. Often appears intermittently with a worn pedal sensor before failing outright.
Is it safe to drive with P2138?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyPedal position sensor worn or contaminated
- PossibleCorroded pedal connector
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Accelerator Pedal Sensor, Accelerator Pedal Wiring
Related codes
- P2135Throttle/Pedal Position Sensor "A"/"B" Voltage Correlation
- P2136Throttle/Pedal Position Sensor A/C Voltage Correlation
- P2137Throttle/Pedal Position Sensor B/C Voltage Correlation
- P2139Throttle/Pedal Position Sensor/Switch D/F Voltage Correlation
- P213AEGR Throttle Control Circuit B/Open
- P213BEGR Throttle Control Circuit B Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.