Powertrain, generic (extended)

P2105 Throttle Actuator Control System - Forced Engine Shutdown

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P2105 is the most severe throttle failure mode: the controller has decided that throttle control can no longer be trusted and stops the engine. In Ford's 2012 summary the trigger is a serious processor fault found by the separate monitoring processor (Ford calls it the Quizzer); all injectors are switched off and the wrench lamp comes on. Ford sets it without MIL, arguing that a shutdown cannot raise emissions, which matches the CARB idea of emissions-neutral default actions. The cause sits in the engine computer, its supply or a companion code such as P0606 or P2107. For the driver the engine dies or will not keep running. Milder states are forced idle (P2104), limited power (P2106) and limited rpm (P2110).

Likely causes

Monitoring processor detects an internal ECU fault
Unstable ECU supply or ground connection
ECU software fault cured by reprogramming

Symptoms

  • Engine shuts off or will not keep running
  • Wrench or ETC warning lamp, often without MIL

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–1,500
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

throttle actuator controlthrottle position sensorecm

Related codes

P2104P2106P2110P2107P0606

References: newtonnet.co.uk, law.cornell.edu.