OBD-II code · Powertrain (generic, extended)
P2123 Throttle/Pedal Position Sensor "D" Circuit High
Throttle/Pedal Position Sensor "D" Circuit High: the signal voltage is above the expected range. Often an open circuit or a short to supply voltage.
Is it safe to drive with P2123?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to supply
- PossibleSensor ground open
- Less likelyConnector pins corroded - high contact resistance
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
- P2125Throttle/Pedal Position Sensor "C" Circuit High
- P2128Throttle/Pedal Position Sensor "E" Circuit High
- P2133Throttle/Pedal Position Sensor "E" Circuit High
- P2138Throttle/Pedal Position Sensor "D"/"E" Voltage Correlation
- P2120Throttle/Pedal Position Sensor "C" Circuit
- P2121Throttle/Pedal Position Sensor "C" Range/Performance
- P2122Throttle/Pedal Position Sensor "D" Circuit Low
- P2124Throttle/Pedal Position Sensor "C" Circuit Low
- P2126Throttle/Pedal Position Sensor "C" Circuit Intermittent
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.