Powertrain, generic (extended)

P2A60 Alternative Fuel Tank B Level Sensor Range/Performance

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2A60 flags a tank B level that is electrically valid but does not behave like a real fuel quantity: it fails to drop while gas is used from tank B, does not climb after filling, or swings wildly although the tank is at rest. Roush documents the stuck logic for its propane primary sender as P25B0, set when the value stays put over a considerable distance. On LPG the cause is often mechanical, a float arm bent or jammed inside the tank; with CNG, where the level is calculated, a drifting pressure sensor or a cold fill can mislead it, and GM notes that its gauge may read below full after refuelling in the cold. No manufacturer publishes P2A60 or its limits; CARB asks for rationality checks on such inputs. Compare the sender with the tank's own dial gauge.

Likely causes

Float arm in tank B bent or jammed (LPG)

Pressure or temperature input behind the calculated level drifting (CNG)

Contact resistance shifting the sender signal

Symptoms

Check engine light after several trips
Gas gauge does not move as fuel is used
Unexpected running out of gas

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€80–700

Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

alt fuel tank b level sensorwiring harnessafcm

References: law.cornell.edu, roushcleantech.com, static.nhtsa.gov.