Throttle Actuator Control System Stuck Closed
The P2112 code indicates that the Powertrain Control Module (PCM) has detected the throttle actuator control system is stuck in the closed position. This means the throttle plate is not responding properly to commands, likely due to mechanical binding, carbon buildup, or an electrical fault in the throttle body or its circuit. The system uses an electronic throttle control (ETC) motor to open and close the throttle plate based on accelerator pedal input; when stuck closed, the engine cannot receive adequate air, severely limiting performance.
01. Most Common Causes
- Carbon buildup on throttle plate or bore causing sticking
- Faulty throttle actuator motor or control circuit
- Defective throttle position sensor (TPS)
- Wiring or connector issues in the throttle actuator circuit
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Engine stalls or fails to start
- Poor acceleration or hesitation
- Idle issues (rough idle or high idle)
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and verify the P2112 code. Check for additional codes.
Step 2: Inspect the throttle body for carbon buildup or mechanical binding. Clean if necessary.
Step 3: Test the throttle actuator motor and throttle position sensor with a multimeter per manufacturer specs.
Step 4: Check wiring and connectors for damage, corrosion, or loose connections.
Step 5: If all else passes, replace the throttle body assembly and reprogram if required.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may enter limp mode, stall, or lose power unexpectedly, increasing the risk of an accident. Have it diagnosed and repaired immediately.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. Cleaning the throttle body is cheaper ($50-$100), while replacing the throttle body assembly can cost $200-$400.