Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 22
Possible causes
- Signal wire shorted to ground high
- TPS internally failed medium
- 5V reference voltage to TPS missing low
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.5–2.5 h
- Component: throttle position sensor
- Component: throttle position sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012