Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / B2
Possible causes
- Signal wire open high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 100–600 €
- Estimated time: 0.5–3 h
- Component: alt fuel tank level sensor
- Component: sensor wiring
- MIL / check engine light
Sources
References
sae:J2012