P2118 Code: Throttle Actuator Control Motor Current Range / Performance

The electronic throttle control (ETC) system is a system that electrically opens the throttle valve. The parts of the ETC system, which consist of  accelerator pedal position (APP) sensors, electronic throttle actuator, and throttle position (TP) sensors, are interconnected and controlled by a control module, which is usually the powertrain control module (PCM).

If the PCM detects that the ETC system is not working as it should, a code will be logged by on-board diagnostics.  Usually, throttle response will be limited or non-responsive and a warning light will be illuminated.

What Does the P2118 Code Mean?

Diagnostic trouble code (DTC) P2118 stands for “Throttle Actuator Control Motor Current Range/Performance.” Note that this code does not appear in every vehicle’s code library.

The PCM controls the ETC system by monitoring its throttle position sensors. These sensors provide throttle angle feedback to the vehicle’s computer.

As the driver steps on the accelerator pedal, the APP sensor sends a signal to the PCM to determine how much power is being requested from the engine. This will then allow the throttle plate to open or close accordingly.

If the PCM detects higher than normal current is required to move the throttle plate, a code P2118 will be stored. The PCM may also put the engine into a “limp home mode” or “fail-safe” position to prevent unwanted acceleration.

P2118 on Some Ford Vehicles

Ford defines the P2118 as follows:

P2118 is set when an excessive amount of current is required to operate the throttle actuator control (TAC) motor, i.e., when the amount of current required to move the throttle plate is higher than a calibrated threshold limit.

The most likely causes of this code are:

• TAC motor is damaged
• TAC motor harness circuits are short together
• Obstruction in the throttle plate movement

Note: The definition of code P2118 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P2118 Code?

• Throttle control motor failure
• Circuit issues, such as damaged wires or a poor connection
• Faulty throttle position sensor
• Dirty or defective throttle body
• Defective accelerator pedal position sensor
• An issue with the PCM, such as software in need of an update

What are the Common Symptoms of the P2118 Code?

• Illuminated check engine light
• Vehicle stuck in “limp” mode
• Engine won’t start or stalls
• Little to no throttle response

How to Diagnose the P2118 Code

DTC P2118 is a generic powertrain code that applies to OBD-II equipped vehicles with an electronic throttle control system. While different makes may exhibit similar symptoms and causes related to the code, the steps for diagnosing and repairing each vehicle may vary depending on the automaker’s specifications.

If you’re not familiar with the process of diagnosing trouble codes, it may be best to leave the job to a licensed mechanic. Here are some useful videos that show what the process might involve:

How to Fix Code P2118

Fixing code P2118 on your own may be a confusing and frustrating task. It’s a good idea to bring your vehicle to a certified mechanic to get an accurate diagnosis. If you’re a seasoned DIYer who knows your way around cars, make sure that you have the right repair manuals before getting to work. Repair manuals and online repair databases come in handy, as they provide vehicle-specific repair information.