OBD-II code · Powertrain (generic, extended)
P2129 Throttle/Pedal Position Sensor "D" Circuit Intermittent
The "D" channel of the throttle or pedal sensor produces an intermittent signal — typically marginal connector contacts.
Is it safe to drive with P2129?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyConnector intermittent
- PossibleTrack D worn
- Less likelyHarness routed against vibrating component
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, Pedal Sensor Wiring
Related codes
- P0124Throttle/Pedal Position Sensor "A" Circuit Intermittent
- P2126Throttle/Pedal Position Sensor "C" Circuit Intermittent
- P2127Throttle/Pedal Position Sensor "E" Circuit Low
- P2128Throttle/Pedal Position Sensor "E" Circuit High
- P212AThrottle Position Sensor/Switch G Circuit
- P212BThrottle Position Sensor/Switch G Circuit Range/Performance
- P212CThrottle Position Sensor/Switch G Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.