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P2100 - Throttle Actuator Control (TAC) Motor Circuit/Open

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P2100 - THROTTLE ACTUATOR CONTROL (TAC) MOTOR CIRCUIT/OPEN

Description:  A powertrain control module (PCM) fault flag is set indicating the motor circuit is open. May require cycling the key.
Possible Causes: 
  • TAC motor has an open winding
  • TAC motor is damaged
  • TAC motor harness is open
  • TAC motor harness is short to PWR
  • TAC motor harness circuits are short together
  • TAC motor harness connector is unplugged
Diagnostic Aids:  A TAC motor circuit PID reading may indicate a concern, if available.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST DV .
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