P0315Powertrain
Crankshaft position variation not learned
Where to start
The unit has not learned the crankshaft tooth variation. This is not a fault: the code usually appears after a sensor change or a battery disconnect and clears itself after the learning procedure — sometimes a few trips with engine braking are enough.
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 thisP0335: the crankshaft sensor that stalls the car
How the code is built
Letter — the systemPowertrain: engine and transmission
Common or the maker's ownGeneric code: the same on every car
Which part of the engineIgnition system and misfires
Number of the faultThe serial number inside that group — it does not say how serious the fault is
All codes in «Ignition system and misfires»
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.