When I first took my GC in, the dealer said they were not able to locate a problem. A few days later, I took it back in again and asked that they look at it again. I did some research before my 2nd trip in and found there is a sensor on the rear axle that might be causing the problem. When i told the dealer they looked at me as if i was crazy and said they have never heard of such a thing.
2 days later, the dealer called me back and said they corrected the issue. Turns out it WAS the sensor on the rear axle that was bad. I am looking at my work order now from the dealer and it says they replaced " Rear Sensor Assembly- Part number 55079006AD"
Tell your dealer that you want them to take a look at/replace that part number as I would bet that is the root of your problem.
I hope this helps and let us know what the outcome is.
2009 WK Overland 5.7 Hemi