According to the release on NHSTA's website, the 5-Series Gran Turismo's fuel level sensor within the fuel tank can become wedged against the tank. If this occurs, then the fuel gauge in the instrument cluster will display a larger amount of fuel than what's actually in the tank.
The BMW has not yet provided details on the fix nor a any notification on the recall.
But Help Line No. had been established for the Concerned owners of the affected models at 1-800-525-7417.