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.
High severity. Can I keep driving?If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
Most likely causes
- Alt fuel injectors partially clogged
- Tank-fill calibration drifted
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2BB0 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- B: Subsystem depends on the code range
- B0: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2BB0?
If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
What causes code P2BB0?
The most common causes are: alt fuel injectors partially clogged; tank-fill calibration drifted.
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.