P0123: Throttle or pedal position sensor A circuit high

The throttle position signal is above the expected range. The driver may notice limited power or a raised idle.

Likely causes, most common first

  • Short to voltage in the wiring
  • Faulty throttle position sensor
  • Open ground wire
  • Damaged connector

Parts usually involved

  • Throttle position sensor
  • Throttle body
  • Sensor connector

Test before you replace

Check the sensor ground and signal at the connector and test for a short to voltage.

General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.

Run your jobs from your phone
Show the customer the problem and get their yes in seconds.
Sign up free