P2112 Throttle Actuator Control System Stuck Closed
OBD-II Trouble Code Technical Description
Throttle Actuator Control System Stuck Closed
What does that mean?
This generic powertrain diagnostic trouble code (DTC) typically applies to all OBD-II equipped vehicles that use a drive-by-wire throttle control system including but not limited to vehicles from Ford, Volvo, Dodge, Toyota, Lexus, Jeep, Dodge, etc.
The P2112 OBD-II trouble code is one of number of possible codes that indicates that the Powertrain Control Module (PCM) has detected a malfunction with the operation of the Throttle Actuator Control System.
There are six codes that are associated with Throttle Actuator Control System malfunctions and they are P2107, P2108, P2111, P2112, P2118 and P2119. Code P2112 is set by the PCM when the throttle body plate is stuck in the closed position.
The PCM controls the Throttle Actuator Control System by monitoring one or more throttle position sensors. The operation of the throttle body is determined by the position of the throttle plate that is controlled by one or more Throttle Actuator Control Motors. The PCM also monitors the accelerator pedal position sensor to determine how fast the driver wants to go and then determines the appropriate throttle response. The PCM accomplishes this by a changing current flow to the Throttle Actuator Control Motor that moves the throttle plate to the desired position. Some malfunctions will cause the PCM to restrict the operation of the Throttle Actuator Control System. This is known as fail-safe or limp mode where the engine is held at idle or may not start at all.
Code Severity & Symptoms
The severity of this code can be moderate to severe based on the specific malfunction. Symptoms of a P2112 trouble code may include:
Engine will not start Poor performance that progresses Little, or no throttle response Check Engine Light illuminated Smoke from tailpipe Increased fuel consumptionCommon Causes Of A P2112 Code
Possible causes of this code may include:
Faulty throttle body Dirty throttle plate or linkage Faulty throttle position sensor Defective accelerator pedal position sensor Throttle actuator control motor is defective Corroded or damaged connector Faulty or damaged wiring Faulty PCMCommon Repairs
Replacing throttle body Cleaning throttle plate and linkage Replacing throttle position sensor Replacing throttle actuator control motor Replacing accelerator pedal position sensor Cleaning corrosion from connectors Repairing or replacing wiring Flashing or replacing PCMDiagnostic and Repair Procedures
Check for TSBs
The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB's) for the specific vehicle by year, model and power plant. In some circumstances this can save a lot of time in the long run by pointing you in the right direction.
2010-2011 Ford & Lincoln P2111 / P2112 TSB Bulletin 10-21-6
One known bulletin, for example, is Ford TSB 10-21-6 which applies to certain 2010-2011 Ford Fusion, Ford Taurus, Focus, E-150, E-250, Ford Edge, Ford F150, Lincoln and Ford Flex vehicles with certain engine. If you have a P2111 and/or P2112 code with that vehicle, here is a PDF copy of the full TSB 10-21-6 bulletin. The fix involves replacing the throttle body with either part number 7T4Z-9E926-FA or 8S4Z-9E926-B.
Some 2010 Edge, MKX, F-150, E-Series, 2010-2011 Flex, MKT, Focus, Taurus, MKS, Fusion and MKZ vehicles with any of the following engines: 2.0L, 3.5L (excluding GTDI), 3.7L and 4.6L 2V, may exhibit Diagnostic Trouble Codes (DTCs) P2111, P2112, or the idle speed drops lower than desired and/or fluctuates. The idle speed concern can be intermittent and DTCs P2111, P2112 may or may not be present.
Photo copyright Ford Motor Company
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