P2101Powertrain
Throttle actuator — range or performance fault
Where to start
The throttle plate does not reach its commanded position. Usually soot: the plate cokes up at its edge and sticks. Removing and cleaning takes half an hour. ⚠️ Many cars then need the closed position re-taught — without that the idle hunts and it looks as if the cleaning made things worse.
What to watch in live data
A code is not a diagnosis. It says which check failed, not which part to replace. Clearing it without repair only means the car will report it again in a few trips.
How to put together a report a mechanic will actually read
We have a detailed piece on thisThrottle position sensor: P0121, P0122, P0123 and P2135
How the code is built
Letter — the systemPowertrain: engine and transmission
Common or the maker's ownGeneric code, second group
Which part of the engineFuel and air metering
Number of the faultThe serial number inside that group — it does not say how serious the fault is
All codes in «Throttle and accelerator pedal»
How it feels behind the wheel
The same fault shows itself in different ways. Each sign below says what to look at in the live data.
How the app helps
CarScan reads this code from your car through an OBD-II adapter, shows whether it is active now or only stored, names the module that reported it, and puts it into a plain-text report for your mechanic.