Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 38
Possible causes
- Pedal position sensor worn or contaminated high
- Corroded pedal connector medium
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.3–1.5 h
- Component: accelerator pedal sensor
- Component: accelerator pedal wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012