P CODES (POWERTRAIN) P0100 - P0199 P0124

    P0124 Trouble Code: Diagnosis and Repair Guide for Throttle Position Sensor/Switch A Circuit Intermittent


    The throttle/pedal position sensor/switch is an essential component in the engine management system. It is responsible for monitoring the position of the throttle pedal and transmitting this information to the engine control module (ECM). The ECM uses this information to calculate the appropriate amount of fuel to be injected into the engine to achieve the desired level of performance. In this article, we will discuss the trouble code P0124, which indicates an intermittent issue with the throttle/pedal position sensor/switch circuit.

    Diagnosing P0124

    If your vehicle's ECM detects an intermittent issue with the throttle/pedal position sensor/switch circuit, it will trigger the P0124 trouble code. The first step in diagnosing this issue is to check the sensor's wiring harness and connector for any signs of damage, corrosion, or loose connections. If you find any issues, you should repair or replace the affected components as necessary.

    If the wiring harness and connector appear to be in good condition, the next step is to test the sensor itself. To do this, you will need a digital multimeter (DMM). Set the DMM to measure resistance and connect the leads to the sensor's terminals. The sensor's resistance should increase smoothly and steadily as you slowly depress the throttle pedal. If you notice any jumps or drops in the resistance, this could indicate a faulty sensor that needs to be replaced.

    Repairing P0124

    If you have determined that the throttle/pedal position sensor/switch circuit is faulty, the first step in repairing the issue is to replace the sensor. To do this, you will need to locate the sensor, which is typically located near the throttle body. Once you have located the sensor, disconnect the wiring harness and remove the mounting screws. Install the new sensor, reconnect the wiring harness, and reattach the mounting screws.

    After replacing the sensor, you will need to clear the trouble code from the ECM's memory. To do this, you can use a code scanner or simply disconnect the battery for a few minutes. Once the code has been cleared, start the engine and check for any signs of the P0124 trouble code returning. If the code does not return, this indicates that the issue has been resolved.


    The P0124 trouble code is an indication of an intermittent issue with the throttle/pedal position sensor/switch circuit. If you encounter this issue, the first step is to diagnose the issue by checking the wiring harness, connector, and sensor. If you determine that the sensor is faulty, you will need to replace it and clear the trouble code from the ECM's memory. By following these steps, you can resolve the issue and get your vehicle back on the road in no time.

    Ask a new Topics question
    Sponsored links