Powertrain, generic (extended)

P2101 Throttle Actuator A Control Motor Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Here the controller compares where throttle A should be with where its position sensors say it is. GM's 2018 table 18OBDG03A flags a gap of more than 10 percent between measured and modelled position after 15 counts at 12.5 ms each, classed by GM as Type A with immediate MIL; the 2006/2007 tables used 8.4 percent. VW's 2014 data book accepts 4-50 percent deviation or a drive duty cycle above 80 percent. Ford sets it with MIL and wrench lamp; Mercedes-AMG M177 engines show it with corroded throttle connector pins, and GM issued field bulletins for the LGZ V6 and 2017 V8 trucks. Causes are mostly mechanical or contact problems, not a dead circuit (P2100). Expect reduced power or limp mode.

Likely causes

Carbon or ice makes the throttle plate stiff or sticky
High resistance at the throttle connector pins
Worn gear train or weak motor inside the throttle body
Deformed inlet duct or leak at the throttle body

Symptoms

  • Reduced engine power message or limp mode
  • Engine warning lamp on
  • Hesitation or uneven idle
  • Stalling in some cases

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–600
Time0.5–2 h

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

Parts involved

throttle actuator motorthrottle body

Related codes

P2100P2111P2112P2118P2119P210B

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.