OBD-II code · Powertrain (generic)
P01B2 Alternative Fuel Tank A Level Sensor Circuit High
Alt fuel tank A level sensor signal voltage above expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P01B2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire open
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Alt Fuel Tank Level Sensor, Sensor Wiring
Related codes
- P2A62Alternative Fuel Tank B Level Sensor Circuit High
- P2A67Alternative Fuel Tank C Level Sensor Circuit High
- P01AFAlternative Fuel Tank A Level Sensor Circuit
- P01B0Alternative Fuel Tank A Level Sensor Range/Performance
- P01B1Alternative Fuel Tank A Level Sensor Circuit Low
- P01B3Alternative Fuel Tank A Level Sensor Circuit Intermittent/Erratic
- P01B4Alternative Fuel Rail Temperature Sensor Circuit
- P01B5Alternative Fuel Rail Temperature Sensor Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.