Code result
P2BB2
Alternative Fuel Tank Empty
Moderate severity
What it means
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?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Tank actually empty - refuel required
highOne of the most commonly reported causes for this code — check this first.
Level sensor reads empty incorrectly
mediumA plausible cause — test and verify before replacing parts.
Related help
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