Flash: Drivetrain Control Module (DCTM) - Transfer Case Operational Enhancements
This bulletin involves flashing the Drivetrain Control
Owners may indicate that they have experienced one or
more of the following symptoms:Moaning or groaning noise while coasting and/or during a
very light acceleration around 5 to 8 mph (8 to 13 kph).The SERV 4WD message appears and the vehicle shifts from
4WD to 2WD.Binding of the front driveline while turning on steep grades
at speeds around 3 to 5 mph (5 to 8 kph).Surge/Shudder at speeds greater than 50 mph (80 kph).