Trouble codes › P2122
P2122 Throttle/Pedal Position Sensor/Switch "D" Circuit Low
Throttle
P2122 means accelerator pedal sensor D's signal is too low, usually a failing pedal assembly or wiring.
On most vehicles, sensors D and E are in the accelerator pedal. P2122 means the signal from pedal sensor D is too low, usually from wiring or a failed pedal sensor.
The engine may not respond to the pedal properly or go into limp mode. Drive only as needed and get it fixed.
Common causes
- A failed accelerator pedal position sensor (replaced as a pedal assembly on most vehicles)
- An unplugged or corroded connector at the pedal
- Damaged wiring
Symptoms
- Limp mode, poor acceleration
- Engine not responding to the pedal
- Check-engine light
What to check first
- Check the connector at the pedal.
- Check the pedal sensor's reference voltage and ground.
- Watch both pedal sensor readings with a scan tool while pressing slowly.
- Replace the pedal assembly if the sensor is faulty.
What does P2122 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P2122No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P2122 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.