P2112 on Toyota: How to Diagnose & Fix
Throttle Actuator Control System - Stuck Closed
1 Toyota model · 1 documented issue · 1 critical
P2112 on Toyota by model: symptoms, diagnosis and fix
Owners of 2006-2010 Corollas equipped with the electronic throttle control system (ETCS-i) reported episodes of low-speed surging — the car lunging or accelerating slightly on its own at low speed (e.g., in parking lots or creeping traffic) such that braking sometimes felt insufficient to stop in time. NHTSA received a petition and opened scrutiny covering roughly 1.69 million 2006-2010 Corollas with electronic throttle control, separate from (and in addition to) the well-known floor-mat-entrapment and sticky-accelerator-pedal recalls of the same era. While Toyota and NHTSA's technical reviews did not confirm an electronic root cause, the surging complaints are numerous, well-documented, and a frequent owner search.
Common Symptoms
- Vehicle lunges or surges forward at low speed
- Brief unexpected acceleration in parking lots / stop-and-go traffic
- Higher-than-expected idle or RPM creep
- Brake pedal feels like it must be pressed harder to stop
- Hesitation followed by surge on tip-in
How to Fix
First rule out the known mechanical recall causes: verify the floor-mat-entrapment and accelerator-pedal recalls are completed for your VIN at toyota.com/recall (floor-mat shimming/pedal replacement). Ensure only correct, properly secured Toyota all-weather mats are used. Have the throttle body cleaned and the accelerator pedal position sensor and ETCS checked; clear any stored throttle/idle codes. If surging persists, document it (dashcam/video), report it to NHTSA, and have a dealer inspect for throttle/idle-control faults.
Sources for this issue (3)
P2112 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2112 mean on a Toyota?
P2112 stands for "Throttle Actuator Control System - Stuck Closed." P2112 means the throttle actuator control (electronic throttle) system is stuck in the closed position. On drive-by-wire engines the computer moves the throttle plate with an electric motor and confirms its position with sensors; when it commands the throttle open but the plate won't move past closed, this code sets. This usually triggers limp/failsafe mode with greatly reduced power, a poor or surging idle, or a no-acceleration condition. It points to a mechanical or electrical problem in the throttle body or its control circuit. On Toyota it is documented across 1 model: Corolla.
What are the most common causes of P2112?
The most common causes of P2112 are: Carbon buildup or debris binding the throttle plate, Failed throttle body actuator motor, Faulty throttle position sensor inside the throttle body, Damaged or corroded throttle body connector/wiring, Loss of power or ground to the throttle body, Seized or mechanically stuck throttle plate, Faulty throttle control circuit in the PCM/ECM. The specific cause varies by vehicle.
How much does it cost to fix P2112 on a Toyota?
Repair costs vary widely with the root cause and Toyota model; each issue on this page carries its own estimate where one is published.
Looking for P2112 on a different make?
View P2112 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.