One problem related to hatchback/liftgate lock has been reported for the 1998 Chevrolet Tahoe. The most recently reported issues are listed below.
Power door locks would lock & unlock after getting wet. Have taken to dealer for repairs, but problem with the locks has reappeared. Also, rear hatch would open unexpectedly while driving. Have taken vehicle back to dealer for repairs. The keyless entry also failed. The hood release handle malfunctions.