OBD-II code · Powertrain (generic, extended)
P2135 Throttle/Pedal Position Sensor "A"/"B" Voltage Correlation
The two redundant throttle position sensors on the throttle body disagree by more than allowed. Distinct from P2138 which monitors the pedal pair — P2135 monitors the throttle-body pair on drive-by-wire systems.
Is it safe to drive with P2135?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyThrottle position sensor track worn
- PossibleCorrosion on throttle body 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
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Throttle Position Sensor, Throttle Body
Related codes
- P2138Throttle/Pedal Position Sensor "D"/"E" Voltage Correlation
- P2132Throttle/Pedal Position Sensor "E" Circuit Low
- P2133Throttle/Pedal Position Sensor "E" Circuit High
- P2134Throttle/Pedal Position Sensor/Switch F Circuit Intermittent
- P2136Throttle/Pedal Position Sensor A/C Voltage Correlation
- P2137Throttle/Pedal Position Sensor B/C Voltage Correlation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.