OBD-II code · Powertrain (generic, extended)
P2109 Throttle/Pedal Position Sensor A Minimum Stop Performance
The ECU detects that the throttle position sensor A signal at the closed-throttle stop does not match the learned minimum value. The mechanical or electrical zero reference of the throttle has drifted out of the expected range, often after cleaning, replacement or wear.
Is it safe to drive with P2109?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyCarbon deposits on throttle plate
- Most likelyThrottle position sensor drift
- PossibleIdle/throttle relearn not performed
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
- 0.3–1.5 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, Throttle Actuator
Related codes
- P2115Throttle/Pedal Position Sensor A Minimum Stop Performance
- P2116Throttle/Pedal Position Sensor B Minimum Stop Performance
- P2117Throttle/Pedal Position Sensor C Minimum Stop Performance
- P2106Throttle Actuator Control System — Forced Limited Power
- P2107Throttle Actuator Control Module Internal Processor
- P2108Throttle Actuator Control Module Performance
- P210AThrottle Actuator B Control Motor Circuit/Open
- P210BThrottle Actuator B Control Motor Circuit Range/Performance
- P210CThrottle Actuator B Control Motor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.