P2112 Error Code
Issue Description
The P2112 error code on Ford vehicles is a "Throttle Actuator Control System - Stuck Closed" system error indicating that the throttle body is stuck in a closed position. Modern Ford engines use an electronic throttle control system, where the throttle position is managed by the Powertrain Control Module (PCM) using a motorized throttle actuator, rather than a traditional cable. When this system fails or the throttle blade becomes stuck, the PCM will trigger the P2112 error code, indicating an issue with the throttle actuator control system.
When the throttle body gets stuck closed, it can severely impact the vehicle’s performance, as it restricts airflow into the engine and can prevent the engine from running smoothly or even starting.

Symptoms
The P2112 code is usually accompanied by noticeable symptoms, as it directly affects engine airflow and performance. Common symptoms include:
- Check Engine Light (CEL): The Check Engine Light will illuminate on the dashboard.
- Reduced Power or Limp Mode: The PCM may limit engine power, putting the vehicle in "limp" mode to prevent damage.
- Poor Acceleration: Drivers may experience reduced throttle response or poor acceleration, as the engine receives insufficient air.
- Engine Stalling or Difficulty Starting: In severe cases, the engine may stall immediately after starting, or it may be difficult to start altogether.
- Rough Idle: The engine may idle roughly or hesitate, as it is not receiving the correct amount of air.
Causes
Several factors can lead to the P2112 code on a Ford vehicle. The most common causes include:
- Stuck Throttle Plate: Dirt, debris, or carbon buildup on the throttle plate can prevent it from opening and closing properly, causing it to get stuck in the closed position.
- Faulty Throttle Body: A malfunctioning throttle body or actuator motor may fail to control the throttle blade, leading to the stuck position.
- Throttle Position Sensor (TPS) Issues: The TPS monitors the position of the throttle plate and relays information to the PCM. A faulty TPS can lead the PCM to misinterpret the throttle plate’s position, triggering the P2112 code.
- Wiring or Connector Issues: Damaged or corroded wiring and connectors in the throttle actuator circuit can prevent the actuator from receiving proper signals, causing a throttle malfunction.
- Faulty PCM: In rare cases, the PCM itself may have a software or hardware issue preventing it from properly controlling the throttle actuator.
- Mechanical Obstructions: Physical obstructions in the throttle body, such as broken components or foreign objects, may prevent the throttle from opening.
Diagnostic Steps
Proper diagnosis of the P2112 code is essential to identify the specific cause of the issue and avoid unnecessary repairs. Here are common diagnostic steps a mechanic might follow:
- Scan for Additional Codes: Using an OBD-II scanner, check for other related codes, especially throttle position or airflow-related codes that may point to further issues with the throttle control system.
- Visual Inspection of the Throttle Body: Inspect the throttle body for visible obstructions, such as carbon deposits or debris that could be causing the throttle plate to stick.
- Check Throttle Body Movement: With the engine off, check the throttle plate’s movement by manually pushing it open and closed to see if it moves freely. Any resistance could indicate a blockage or mechanical problem.
- Test the Throttle Position Sensor (TPS): Using a multimeter, test the TPS to confirm it is within the manufacturer’s specifications. If it fails, it may need replacement.
- Inspect Wiring and Connectors: Examine the wiring and connectors to the throttle body for damage, corrosion, or disconnections. Loose or corroded connectors may prevent proper throttle actuator operation.
- Check PCM Functionality: If all other components appear to be functioning correctly, consider testing or reprogramming the PCM, as it could be failing to control the throttle actuator.
Solutions
Once the underlying issue causing the P2112 code is identified, the appropriate repair can be made. Here are the most common solutions:
- Clean the Throttle Body: If carbon buildup or debris is causing the throttle plate to stick, cleaning the throttle body can often resolve the issue. Disconnect the intake hose, open the throttle body to access the plate, and clean with throttle body cleaner and a soft brush. After cleaning, clear the code with an OBD-II scanner and test drive the vehicle.
- Replace the Throttle Body: If the throttle body actuator motor or throttle plate mechanism is faulty, replacement of the entire throttle body may be necessary. Disconnect the wiring and intake hoses, remove the old throttle body, install the new one, and reconnect all components. Clear the code and test the vehicle to confirm the fix.
- Replace the Throttle Position Sensor (TPS): If the TPS is malfunctioning, replacing it can restore proper throttle response. Remove the old TPS from the throttle body, install the new sensor, and reconnect all wiring. Clear the code and test the vehicle to verify repair.
- Repair or Replace Wiring and Connectors: Damaged or corroded wiring and connectors should be repaired or replaced to ensure proper signal flow to the throttle actuator. Inspect the wiring harness, repair or replace any damaged wires, clean corroded connectors, and ensure all connections are secure.
- Reprogram or Replace the PCM (Rare): If all other components are functional, reprogramming or replacing the PCM may be necessary to ensure proper throttle control. A certified technician or Ford dealership can reflash or replace the PCM using specialized software and tools. After the procedure, clear the code and verify functionality.
Preventive Measures
Regular maintenance and attention to throttle body cleanliness and wiring integrity can help prevent the P2112 code from occurring. Consider the following preventive steps:
- Routine Throttle Body Cleaning: Regularly clean the throttle body to prevent carbon buildup that can lead to throttle plate sticking. This is especially important for vehicles driven in stop-and-go traffic or harsh conditions.
- Check Wiring and Connectors Periodically: Inspect the wiring and connectors for the throttle body actuator circuit, especially if the vehicle is exposed to moisture, dirt, or corrosion-prone environments.
- Avoid Aggressive Throttle Use: Frequent aggressive acceleration can place strain on the throttle actuator components. Avoiding excessive throttle use may prolong the life of the actuator and related parts.
- Respond Promptly to Warning Signs: If the Check Engine Light or symptoms like rough idle or reduced power occur, have the vehicle checked as soon as possible. Early attention to throttle issues can prevent more serious failures and additional repair costs.