back-up sensors

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Buick Ownership
2011 Lacrosse
2011 Lacrosse back-up beeping intermittently while moving in reverse when there is nothing in the way,also beeps when shifting into reverse, but works fine while sitting still and someone walks or drives across rear.
 
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Illinois
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
A wire is loose or shorting out, a bad sensor, a sensor may have something partially blocking it or the module may be bad, unfortunately I not aware of how to test if it's a module and may be a dealer visit. Maybe someone else has a known method for checking these.
 
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