P2109 — Throttle/Pedal Position Sensor A Minimum Stop Performance

P2109: Throttle/Pedal Position Sensor A Minimum Stop Performance — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Throttle/Pedal Position Sensor A Minimum Stop Performance. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Idle may be unstable or higher than expected.
  • A warning lamp, difficult starting or limited engine power may occur.

Possible causes

  • A throttle plate obstructed by deposits or mechanical sticking may prevent the expected minimum position.
  • Throttle-position feedback, actuator condition or connector faults may also be involved.

What to check

  • Check companion codes and visually inspect the throttle plate for deposits or obstruction with the engine off.
  • Inspect throttle wiring and connectors, then compare minimum-position feedback with the commanded position.
  • Use vehicle-specific testing before attempting adjustment or actuator replacement.

Also written as: P2109-00, P210900 (some scan tools add the fault-type byte, e.g. -00).