OBD-II code · Powertrain (generic, extended)
P2BB2 Alternative Fuel Tank Empty
The AFCM detects that the alternative fuel tank is empty. Bi-fuel vehicles may switch to gasoline operation; mono-fuel vehicles cannot continue without refuel.
Is it safe to drive with P2BB2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyTank actually empty - refuel required
- PossibleLevel sensor reads empty incorrectly
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0–1 h
- Emissions test
- Usually unaffected
- Parts involved
- Alt Fuel Tank, Alt Fuel Level Sensor
Related codes
- P2BAFNOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1
- P2BB0Alternative Fuel Consumption Too Low
- P2BB1Alternative Fuel Consumption Too High
- P2BB3Fuel Pump Secondary Circuit Performance
- P2BB4Engine Coolant Temperature Sensor 4 Circuit Intermittent/Erratic
- P2BB5Engine Coolant Temperature Sensor 5 Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.