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P2100 is a diagnostic trouble code (DTC) for "Throttle Actuator Control Motor Circuit Open (TACM)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Throttle Actuator Control Motor Circuit Open (TACM)
P2100 is an OBD-II generic code which indicates that the throttle actuator control motor (TACM) circuit is open, as detected by the Engine Control Module (ECM). The throttle actuator will not work.
The ECM does not get a correct closed throttle reading from the TACM during startup or during operation
The ECM puts the TACM in failure mode and closes the throttle valve if it is possible
The Check Engine Light will not be illuminated and the code will be set in ECM memory as a TACM fault.
The throttle will stay at idle and will not go above idle if the accelerator pedal is pushed.
Scans and documents the codes in the ECM
Diagnoses as per the manufacturer's pinpoint test (prevents bodily damage from throttle plates closing on one’s fingers)
Clears the ECM code P2100 and verifies whether the code comes back
Monitors the throttle position sensors 1 and 2 when the accelerator is pushed to see if the TACM moves within specifications and both sensors are within specs
Tests and confirms the wiring and connector to the TACM to be good
Code P2100 is an indication that the throttle cannot be opened by the actuator and the vehicle will only idle. This would make the vehicle not drivable.
Code P2100 is the most common failure with the throttle actuator besides the actuators internal throttle plate position sensor. The actuator is replaced as an assembly. Trying to move the throttle plates by hand can cause the throttle plate to snap closed causing your fingers to get hurt.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.