P2101 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit Range/Performance

P2101 trouble code definition

Throttle Actuator Control Motor Circuit Range/Performance

What the P2101 code means

P2101 is an OBD-II generic code for the engine control module (ECM) detecting the throttle actuator control (TAC) went out of the range of the circuit causing an open circuit to be detected in the TAC motor.

What causes the P2101 code?

• The engine control module (ECM) signal returns from the TAC is an open circuit.

• The TAC motor wires are cross wired causing an open circuit to the ECM.

• Harness or connector has an open circuit or the connector is loose.

What are the symptoms of the P2101 code?

• The Check Engine Light will be illuminated and the code is set in ECM memory as a fault.

• The engine will not accelerate and no throttle response will happen.

• The engine will idle and that is all. The idle may be lower or higher than normal.

How does a mechanic diagnose the P2101 code?

• Scans codes and documents the code in the ECM

• Diagnoses the code as per the manufacturer's pinpoint test to verify the TAC signal

• Operates the accelerator pedal while monitoring throttle position sensors and TAC operation

• Checks the harness and connection to the TAC visually for problems and connector is on

• Tests the TAC as per the manufacturer’s specified pinpoint test

Common mistakes when diagnosing the P2101 code?

• Clearing ECM memory codes before checking the freeze frame data of the TAC failure so the failure may be duplicated

• Failing to clear ECM codes after the P2101 codes are fixed

• Replacing the TAC when the problem has not been duplicated

How serious is the P2101 code?

Code P2101 is an indication that the TAC is not able to open and close the throttle plates and the engine will not accelerate and would not be drivable.

What repairs can fix the P2101 code?

• Replacing the TAC assembly if it fails all pinpoint tests and problem has been verified

• Repairing the wiring or connection to the TAC assembly

• Replacing the ECM as directed by the pinpoint test

Additional comments for consideration regarding the P2101 code

Code P2101 can be generated without an error on some vehicles if the accelerator pedal is pressed before turning on the key. A key recycle without touching the pedal may fix the problem even though the code is set in memory and the check engine light will be on and would need to be reset. This is why it is important to verify the problem before any repairs are done.

Need help with a P2101 code?

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