P2118
Throttle Actuator Control Motor Current Range/Performance
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Code P2118 means your engine's computer has detected that the electric motor inside the throttle body is drawing an abnormal amount of electrical current or is not performing within its expected range. The throttle body is a critical component in modern drive-by-wire systems — it replaces the old mechanical cable with an electronically controlled motor that opens and closes the air intake based on how far you press the gas pedal.
When this code sets, your vehicle will very likely enter limp mode, drastically reducing power to protect the engine and transmission. You may notice the car feels sluggish, barely accelerates, or even stalls. This is a safety response by the computer to prevent uncontrolled acceleration if the throttle is malfunctioning.
Start by having the throttle body cleaned, as carbon buildup is a common and inexpensive cause. If that doesn't resolve the issue, a mechanic should inspect the wiring harness and connectors for damage. If the throttle body motor itself has failed, the entire throttle body typically needs replacement. Do not ignore this code — driving in limp mode for extended periods can cause additional stress on other drivetrain components.
Severity
Symptoms
- •Engine enters limp mode with severely limited power
- •Poor or no throttle response when pressing gas pedal
- •Engine stalling or refusing to start
- •Check Engine Light illuminated
- •Rough or unstable idle speed
Likely Causes
The electric motor that opens and closes the throttle plate can wear out or develop internal resistance, drawing abnormal current that triggers this code.
The wiring harness between the PCM and throttle body is exposed to engine heat and vibration, causing chafed insulation, broken wires, or corroded connectors that alter motor current readings.
Accumulation of carbon deposits on the throttle plate and bore causes the motor to work harder to move the plate, drawing excessive current and triggering the fault.
In rare cases, the powertrain control module itself can misread the motor current signal due to an internal circuit fault or outdated software calibration.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Clean the throttle body and plate with throttle body cleaner to remove carbon deposits
- Inspect and repair corroded or damaged wiring and connectors at the throttle body
- Replace the throttle body assembly if the actuator motor has failed
- Reprogram or update the PCM software at a dealer if no hardware fault is found
Shop Parts
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