P2BB1
Alternative Fuel Consumption Too High
The AFCM detects that alternative fuel consumption exceeds the expected value for the active operating mode. Indicates injector leakage, fuel pressure too high, or unmetered fuel loss.
- 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 injector leakingCommon
- Fuel rail pressure above targetPossible
Parts involved
- Alt Fuel Injectors
- Alt Fuel Rail
- Alt Fuel Pressure Regulator
P2BB1 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.