CHEVROLET/GMC/CADILLAC: TSB HAS AN OWNER'S NOTIFICATION LETTER. SELECT DOCUMENT SEARCH BUTTON BELOW. WATER IS LEAKING ON TO ROOF MOUNTED ANTENNA AND IS PREVENTING ONSTAR SYSTEM TO DETERMINE LOCATION OF VEHICLE BY DISABLING COMPASS, XM RADIO SYSTEM, NAVIGATION. MODEL 2015 ESCALADE, ESCALADE ESV, SILVERADO CREW CAB, SUBURBAN, TAHOE, SIERRA CREW CAB, YUKON, YUKON XL. *PE
