OBD
P2BB1
Alternative Fuel Consumption Too High
What it means
P2BB1 stands for Alternative Fuel Consumption Too High. P2BB1 is a P code, so the fault sits in the engine, transmission and emissions systems. For P2BB1, work through the cause list below, cheapest checks first.
What to check first
For P2BB1, clear the code, drive a short distance and read it again, since a code that comes back is still there and one that does not was history.
Check these first
- P2BB1: Faulty or contaminated sensor in the fuel/air metering circuit
- P2BB1: Damaged or shorted wiring or connector for the affected circuit
- P2BB1: Vacuum leak or intake system restriction
- P2BB1: Failing fuel pump, injector, or fuel pressure regulator
What to do next
P2BB1 reports from the powertrain control system. These steps cover P2BB1 in general, and the exact cause on your vehicle can differ from the cause named above.
- P2BB1: Read freeze frame data and related codes with an OBD-II scanner
- P2BB1: Inspect the affected sensor wiring and connector for damage
- P2BB1: Compare live sensor readings (fuel trim, airflow, temperatures) to manufacturer specs
- P2BB1: Smoke test the intake system if lean or vacuum conditions are suspected
- P2BB1: Replace the failed component after confirming it with live data
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.