P2122: Throttle/Pedal Position Sensor/Switch D Circuit Low Input
Short answer: P2122 means “Throttle/Pedal Position Sensor/Switch D Circuit Low Input”. It is a standard OBD-II code, so the basic meaning is the same on every car. Below is what it means on each of the 6 cars we cover, with a link to the full page for each car.
Standard OBD-II code Same meaning on all cars (SAE J2012).
P2122 on each car
| Car | Meaning on this car | Confidence |
|---|---|---|
| Toyota Passo (1st gen) | Pedal Position Sensor D Low Input | low |
| Toyota Corolla (11th gen, E170) | Throttle/Pedal Position Sensor/Switch D Circuit Low Input | medium |
| Toyota Corolla (10th gen, E140) | Throttle/Pedal Position Sensor/Switch D Circuit Low Input | medium |
| Honda City (5th gen, GM2) | Throttle/Pedal Position Sensor/Switch D Circuit Low Input | medium |
| Honda Civic (10th gen, FC) | Throttle/Pedal Position Sensor/Switch D Circuit Low Input | medium |
| Suzuki Wagon R (Pakistan, K10B) | Throttle/Pedal Position Sensor/Switch D Circuit Low Input | medium |
Symptoms
- Check engine light on
- Rough or low idle
- Stalling
- Surging
- No/little acceleration
Likely causes
- TPS not mounted securely
- TPS circuit short to ground or another wire
- Faulty TPS
- Damaged computer (PCM)
What to check, in order
- Read the code with an OBD-II scanner
- Check the throttle body and pedal sensor connectors
- Clean a dirty throttle body; do not force the valve by hand
- Clear the code; some cars need an idle relearn after cleaning
Causes and checks above are the general meaning. The exact test steps and values differ by car: open your car’s page.