i have had this issue random no start,went over all grounds,grounds under front dash panel,had GM dealer reprogram both fobs and three keys,worked good for three weeks then out of no where it would not start after sitting for less then three minutes,stopped for gas this morning,would not start after filling tank,remote start would work till putting key in and turning on stalled.got out of truck hit lock three times and unlosk three times on remote and it started.WTF.contacted GM looking into it.They have a problem with 14 thru17 with this happening.they need to fix this problem,they built the thing.