P2003Powertrain
Diesel particulate filter efficiency below limit (bank 2)
Where to start
The particulate filter is blocked on the second bank. ⚠️ The first thing to check is whether the filter was ever allowed to CLEAN ITSELF: regeneration needs half an hour of open-road driving and does not start on short town trips. Many «blocked» filters recover after one long run.
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 thisThe diesel particulate filter: signs, regeneration, codes
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, general
Number of the faultThe serial number inside that group — it does not say how serious the fault is
All codes in «Fuel and air metering, general»
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.