OBD-II code · Powertrain (generic)
P0123 Throttle/Pedal Position Sensor "A" High Input
The TPS signal voltage exceeds the upper acceptable threshold. As with P0122, limp-home mode is typical until the fault clears.
Is it safe to drive with P0123?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to supply voltage
- PossibleSensor ground broken
- Less likelyTPS internally failed
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
- 0.5–2.5 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 Position Sensor Wiring
Related codes
- P0120Throttle Position Sensor / Switch A Circuit Malfunction
- P0121Throttle/Pedal Position Sensor "A" Range/Performance
- P0122Throttle/Pedal Position Sensor "A" Low Input
- P0124Throttle/Pedal Position Sensor "A" Circuit Intermittent
- P0125Insufficient Coolant Temperature for Closed Loop Fuel Control
- P0126Insufficient Coolant Temperature for Stable Operation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.