OBD-II code · Powertrain (generic)
P01B3 Alternative Fuel Tank A Level Sensor Circuit Intermittent/Erratic
Intermittent signal from alternative fuel tank A level sensor. 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 P01B3?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyConnector loose or corroded
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Alt Fuel Tank Level Sensor, Sensor Wiring
Related codes
- P2A63Alternative Fuel Tank B Level Sensor Circuit Intermittent/Erratic
- P2A68Alternative Fuel Tank C Level Sensor Circuit Intermittent/Erratic
- P01B0Alternative Fuel Tank A Level Sensor Range/Performance
- P01B1Alternative Fuel Tank A Level Sensor Circuit Low
- P01B2Alternative Fuel Tank A Level Sensor Circuit High
- P01B4Alternative Fuel Rail Temperature Sensor Circuit
- P01B5Alternative Fuel Rail Temperature Sensor Performance
- P01B6Alternative Fuel Rail Temperature Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.