Throttle Actuator Control System -- Stuck Closed
What does P2112 mean?
The P2112 code means the vehicle's onboard diagnostic system has detected: Throttle Actuator Control System -- Stuck Closed. This is a critical severity code.
Common Symptoms
- Engine will not rev above idle
- No throttle response when pressing gas pedal
- Engine stalls when put in gear
- Reduced power warning on dash
- Check engine light on
Probable Causes (Ranked by Likelihood)
- Carbon buildup preventing throttle plate from opening Very High
- Faulty electronic throttle body motor (seized) High
- Broken throttle plate gear or actuator mechanism Moderate
- Wiring failure preventing motor from receiving power Moderate
- Foreign object jamming throttle plate closed Low
Step-by-Step Diagnostic Procedure
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With engine off and throttle connector disconnected, try to move the throttle plate by hand -- should move freely
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If plate is stuck, clean throttle body thoroughly to remove carbon deposits
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Check throttle motor by applying voltage directly -- motor should move the plate
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Inspect throttle body internal gears for damage or stripping
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If motor does not respond to direct voltage, replace the electronic throttle body
Frequently Asked Questions
Can I drive with code P2112?
No. If the throttle is stuck closed, the engine cannot rev above idle and may stall when put in gear. The vehicle is not drivable and should be towed to a repair shop.
Can carbon buildup really prevent the throttle from opening?
Yes. Over time, carbon from the PCV system and blowby gases coats the throttle plate and bore. In severe cases, this buildup creates enough friction to prevent the relatively small throttle motor from opening the plate. Regular cleaning prevents this.
How often should I clean my throttle body?
As a preventive measure, clean the throttle body every 50,000-75,000 miles or whenever you notice idle issues. Vehicles with high PCV system flow or direct injection engines tend to accumulate carbon faster and may need more frequent cleaning.