OBD-II code · Powertrain (generic)
P0122 Throttle/Pedal Position Sensor "A" Low Input
The TPS signal voltage is below the lower acceptable threshold. The ECU usually enters limp-home mode and limits engine torque while the fault is active.
Is it safe to drive with P0122?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to ground
- PossibleTPS internally failed
- Less likely5V reference voltage to TPS missing
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
- P011FEngine Coolant Temperature 2 / Ambient Air Temperature Correlation
- P0120Throttle Position Sensor / Switch A Circuit Malfunction
- P0121Throttle/Pedal Position Sensor "A" Range/Performance
- P0123Throttle/Pedal Position Sensor "A" High Input
- P0124Throttle/Pedal Position Sensor "A" Circuit Intermittent
- P0125Insufficient Coolant Temperature for Closed Loop Fuel Control
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.