Throttle Actuator Control Motor Current Range/Performance
What does P2118 mean?
The P2118 code means the vehicle's onboard diagnostic system has detected: Throttle Actuator Control Motor Current Range/Performance. This is a critical severity code.
Common Symptoms
- Reduced engine power
- Intermittent throttle response issues
- Throttle hesitation during acceleration
- Limp mode activated
- Check engine light on
Probable Causes (Ranked by Likelihood)
- Throttle body motor drawing abnormal current (worn or binding) Very High
- Carbon buildup causing throttle plate to bind High
- Intermittent short in throttle motor wiring Moderate
- Corroded throttle body connector increasing resistance Moderate
- PCM motor driver detecting abnormal current draw Low
Step-by-Step Diagnostic Procedure
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Clean electronic throttle body to reduce mechanical resistance on the throttle plate
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Measure throttle motor current draw with a clamp meter while commanding throttle open and closed
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Check throttle body connector for corrosion or high resistance connections
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Move throttle plate by hand (engine off, disconnected) -- should move smoothly without binding
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Replace throttle body if motor current is outside specification after cleaning
Frequently Asked Questions
Can I drive with code P2118?
Only short distances. The PCM may limit engine power when the throttle motor current is abnormal. The vehicle may feel sluggish or hesitant. Drive to a repair shop as soon as possible.
What causes abnormal throttle motor current?
The most common cause is carbon buildup making the throttle plate harder to move, forcing the motor to draw more current. A worn motor with increased internal resistance or binding gears can also cause abnormal current readings.
Can I just clean the throttle body to fix this?
Often yes. If carbon buildup is causing the throttle plate to bind, cleaning restores normal motor current draw. However, if the motor itself is worn or the internal gears are damaged, the entire throttle body needs replacement.