Rear electrical module may stop working on Volvo S80

The rear electrical module stops working (REM) This affects the fuel gauge and trunk opening switch
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Average mileage: 136,000 (85,000–187,000)
4 model years affected: 1999, 2000, 2001, 2006
5 people reported this problem
problem details
2001 Volvo S80 187,000 mi,
got in the car this morning, says my tank is empty! Was fine yesterday. put 63.00 worth of fuel 3 days ago, very little driving. Thought someone siphoned my tank! went to fuel up. only took 6$ worth. Relieved, I can live without the fuel gauge.