Originally Posted by Kitra
We were out today in our 2011 GC and were slowing down for traffic and Bam! At first we thought we were maybe rear-ended but then realized it was our vehicle misbehaving. It seemed like the transmission lurked really bad on a downshift. It felt almost like it dragged/locked the rear wheels. Then a couple of miles later, it did it again. It jerked the whole vehicle and made a loud thump. We then drove it 20 more miles in traffic and on the highway and it seemed OK but I did lockout the MDS (left shift indicator in "5") just for something to do different. The transmission software was updated a while back so don't know if this is related. Also, is the ECU supposed to kill engine power when it shifts? It seems to kill power on the up-shifts and then resumes. Go figure - we thought the 5 speed autobox was supposed to be the most reliable. And since intermittent, little chance the Dealer can replicate it for troubleshooting and repair.
Thanks for any thoughts and ideas.
TSB 21-003-13 may relate to your vehicle:
Flash: Drivetrain Control Module (DCTM) - Transfer Case Operational Enhancements
This bulletin involves flashing the Drivetrain Control Module (DCTM)
2011 - 2013 WD Durango
2011 - 2013 WK Grand Cherokee
NOTE: This bulletin applies to vehicles equipped with the QUADRA-TRAC II 4WD
System or Two Speed On Demand Transfer Case (Sales Code DKA) and the
• 230MM Rear Axle (Sales Code DR1) and Electronic Limited Slip
Differential (Sales Code DSF)
• 230MM Rear Axle (Sales Code DR1) without Electronic Limited Slip
Differential built after May 1, 2011 (MDH 0501XX).
Owners may indicate that they have experienced one or more of the following symptoms:
1. A driveline bump is felt during acceleration at approximately 10 mph (16 kph).
2. The SERV 4WD message appears and the vehicle shifts from 4WD to 2WD.
3. Binding of the front driveline while turning on steep grades at speeds around 3 - 5 mph
(5 - 8 kph).