Throttle Actuator A Control System - Stuck Closed
What it means
P2112 means the PCM has detected the electronic throttle plate stuck in or near the closed position. On a drive-by-wire system the computer opens the throttle with a motor, and when it can't, the engine gets little air — so the car usually drops into limp mode with sharply reduced power. The most common cause is carbon build-up in the throttle body, though the actuator motor or wiring can also be at fault.
Can I keep driving? Drivable but severely limited — the throttle is stuck near closed, so expect limp mode, little power, and possible stalling; fix before relying on the car.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power / limp (failsafe) mode
- Poor or no throttle response — engine won't rev normally
- Rough idle or stalling
- Hesitation when trying to accelerate
Common causes
Most likely first
- Carbon build-up in the throttle body holding the plate closedLikely
- Failed throttle actuator (drive-by-wire) motorCommon
- Mechanical fault in the throttle valve or return springCommon
- Damaged wiring or a poor connector at the throttle bodyLess often
- Faulty PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note the conditions when the code set.
- Inspect and clean the throttle body — carbon on the plate is the most common cause.
- Check the throttle actuator connector and wiring for damage or corrosion.
- Test the actuator motor and command the throttle with a scan tool to see if it moves.
- Perform a throttle relearn after cleaning; replace the throttle body if the plate or motor is faulty. Reprogram/replace the PCM only as a last resort.
FAQ
Quick answers
Is it safe to drive with P2112?+
Can I just clear P2112?+
Related codes
Read & clear P2112 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.