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Our automotive experts have put together the following information about the P2128 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P2128 code.

What Does P2128 Code Mean?

    OBD-II Code P2128 is defined as a Throttle/Pedal Position Sensor/Switch "E" Circuit High

    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 the Electronic Throttle Control is not operating as requested, the PCM will set code P2128. The PCM may also put the engine into "limp home mode", limiting the available power from the engine to prevent unwanted acceleration.

    P2128 Symptoms

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

    Common Problems That Trigger the P2128 Code

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