stabilitrack and braking system not communicating

bmwfixer

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Buick
good am people ,
I have a 2011 buick lacroose cxl awd , the vehicle sat for about 3 months and I drove it once in a while , well about 1 week ago , the battery was stone dead, I slowly charged it , and now it cranks fine, starts ok, no warning lights on , so I called onstar and asked for a diagnostic check , and they found 1 fault for the stabilitrack and braking system not communicating, was it from the battery going dead , but keep in mind , I have no warning lights on what so ever, vehicle feels fine, stops ok
please advise
thanks
I know bmws , not buicks
 
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