P2BB0
Alternative Fuel Consumption Too Low
The AFCM detects that alternative fuel consumption falls below the expected value for the active operating mode. Indicates injector clogging, leaks before injectors, or incorrect tank-fill correction.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Alt fuel injectors partially cloggedCommon
- Tank-fill calibration driftedPossible
Parts involved
- Alt Fuel Injectors
- Alt Fuel Tank
- Afcm
P2BB0 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.