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What Does P2104 Code Mean?

    OBD-II Code P2104 is defined as a Throttle Actuator Control System - Forced Idle

    The electronic throttle control system (ETCS) controls the throttle valve opening. When the driver presses the accelerator pedal, the Accelerator Pedal Position Sensor (APP) sends a signal to the engine's control module (PCM) telling the PCM how much power the driver is requesting from the engine. The PCM then commands the throttle plate to open accordingly. If the PCM detects that the throttle is not opening correctly in proportion to the signal received from the APP Sensor, the PCM will set code P2104. The PCM may also put the engine into "limp home mode", limiting the available power from the engine to prevent unwanted acceleration.

    P2104 Symptoms

    • Decreased engine performance
    • Engine may enter limp home mode (reduced performance)

    Common Problems That Trigger the P2104 Code

    • Accelerator Pedal Position (APP) assembly failure
    • Powertrain Control Module (PCM) failure
    • Throttle control motor failure
    • Wiring issue
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