P2101Throttle Actuator A Control Motor Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Reduced engine power message or limp mode
- Engine warning lamp on
- Hesitation or uneven idle
- Stalling in some cases
- Likely causes
- LikelyCarbon or ice makes the throttle plate stiff or sticky
- PossibleHigh resistance at the throttle connector pins
- PossibleWorn gear train or weak motor inside the throttle body
- RareDeformed inlet duct or leak at the throttle body
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.