P2104 — Throttle Actuator Control System - Forced Idle

P2104: Throttle Actuator Control System - Forced Idle — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Throttle Actuator Control System - Forced Idle. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • The engine may remain at idle despite accelerator input.
  • A warning light or a marked reduction in vehicle performance may appear.

Possible causes

  • The control system may command forced idle after detecting another throttle or pedal fault.
  • A throttle actuator, position sensor, wiring or connector fault may be involved.

What to check

  • Read P2104 together with other stored throttle-control codes to seek the triggering fault.
  • Inspect the throttle-body and pedal connectors for damage or poor contact.
  • Compare live pedal and throttle-position signals before deciding on repairs.

Also written as: P2104-00, P210400 (some scan tools add the fault-type byte, e.g. -00).