P2118 - Throttle Actuator Control Motor Current Range

Introduction

DTC P2118 trouble code is a common problem that can occur in various modern vehicles equipped with electronic throttle systems. This code refers to an abnormal condition in the current range of the throttle actuator control motor. When this error occurs, the vehicle operation can be affected, making accurate diagnosis and timely repair essential. In this article, we will look at the symptoms, causes, diagnosis, and solutions to deal with DTC P2118 code.

Symptoms

The onset of the DTC code P2118 can manifest itself through various symptoms, including:

  • Engine Malfunction Indicator Light (MIL) Illuminated

  • Slow or poor throttle response

  • Irregular engine idle

  • Sudden engine shutdown

  • Activation of the vehicle's emergency mode (limp mode)

These symptoms may vary depending on the vehicle model and the severity of the problem, but it is essential to pay attention to any abnormalities in the engine's behavior.

Cause

The causes of the DTC code P2118 can be different and may include:

  • Throttle actuator malfunction

  • Problems with the electrical wiring or connectors connected to the actuator

  • Faults in the engine control unit (ECU) or throttle control logic

  • Faulty or dirty throttle position sensors

  • Power supply problems to the throttle control system

It is important to carefully examine each of these potential causes during the diagnostic process.

Diagnosis

Diagnosing DTC P2118 requires a systematic approach. Follow these steps:

  1. Vehicle Scan :
    Use an OBD-II diagnostic tool to check for fault codes. Note any related codes, such as P2116 (Throttle Actuator Control - Position Range), P2117 (Throttle Actuator Control - Motor Current), and P0120 (Throttle Position Sensor Circuit).

  2. Visual inspection :
    Check electrical wiring and connectors for any signs of wear, burning, or corrosion.

  3. Sensor Test :
    Check the throttle position sensors for proper operation using a multimeter. Make sure they provide consistent readings when opening and closing the throttle.

  4. Actuator Test :
    Check the throttle actuator to see if it responds properly to the signals from the engine control unit. You can perform an actuation test to observe the behavior of the actuator.

  5. Checking the control unit :
    If all components appear to be working properly, you may need to check the engine control unit for malfunctions.

Resolution and repair

Once you have identified the cause of the DTC code P2118, you can proceed with the following solutions:

  • Replacing the actuator :
    If the throttle actuator is faulty, it must be replaced. Make sure you use a high quality replacement.

  • Wiring Repair :
    If you find damaged wiring, make any necessary repairs, making sure all connections are secure.

  • Cleaning the sensors :
    If the throttle position sensors are dirty, a thorough cleaning may solve the problem.

  • Resetting the control unit :
    After repairs are made, perform an engine control unit reset to clear the fault code. This may involve using a diagnostic tool.

  • Replacing the control unit :
    If the engine control unit is defective and cannot be repaired, it may need to be replaced.

Insight into the components involved

Throttle actuator and sensors

The throttle actuator is an electrical component that controls the position of the throttle butterflies, thus regulating the amount of air entering the engine. It receives signals from the engine control unit and the throttle position sensors.

Throttle position sensors, usually a potentiometer type sensor, monitor the position of the throttle and send this information to the ECU. A fault in one of these components can lead to inaccurate results and the resulting DTC code P2118.

Conclusions

DTC P2118 is a significant problem for modern vehicles with electronic throttle systems. It is essential to follow a methodical approach to diagnose and resolve the problem. A thorough visual inspection, component testing, and proper repairs can ensure that the vehicle returns to safe and efficient operation. Always remember to clear the fault codes and test the vehicle after each service to confirm that the problem has been resolved.

Important
Not all OBD2 codes used by one manufacturer are used by other brands, and may not have the same meaning.
The information presented here is for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any concerns about repairing your vehicle, please contact your repair shop.