Wife traveling with son on fwy at legal speed of 70 mph w/cruise control on, car suddenly decelerated causing a violent maneuver forcing car into neighboring lane and almost crashing. She stated it was as if it suddenly downshifted into lowest gear and brakes applied forcefully. Regaining control she deactivated the cruise control and proceeded to destination at 50 mph. Took to dealership in davis where it was diagnosed as catastrophic failure of the transfer case which was then replaced at the cost of $2842.75. She retrieved car two days later and proceeded to drive back home (distance is @ 178 mi one way). Car repeated sudden deceleration upon entering the fwy and getting up to speed. Continued home due to medical appointments to keep. Kept cruise control off but called dealership to report that replacing the transfer case did not solve the problem. I pulled codes upon her arriving home and found only code 0430 (catalyst system efficiency below threshold [bank 2] indicating the converter not working to specs. Today she was returning to davis to visit with grandchildren and experienced the same situation. At 70 mph car suddenly decelerated rapidly (as if brakes were applied forcefully) and caused her to abruptly move into the lane to her left. She regained control and continued on at 50 mph. The dealership informed her no mechanics would be available until Monday but as she has a flight out of lax to catch early Monday a.M. she decided to continue on to L.a. without using the cruise control and proceeding at slower speed. The power steering pump was replaced on 4/15/2013 at dealerships recommendation due to a leak and the transmission was serviced in addition to having new valve cover and gasket put on. Spark plugs replaced, throttle body and combustion chambers cleaned and PCV valve replaced. Internet research indicates this is a repeated problem with the Jeep Grand Cherokee

- Westwood, CA, USA

The contact owns a 2008 Jeep Grand Cherokee. The contact stated while driving approximately 25 mph, the vehicle suddenly stalled. After shifting into park, the gear shifter seized and could not be removed from park. The vehicle was taken to the dealer for diagnostic testing. The technician was unable to diagnose the failure. The vehicle was not repaired. The approximate failure mileage was 60,000.

- Born, MA, USA

8/8/12 driving from temple tx to tunica ms (stopping there before continuing on to indianapolis, in). Car gave no issues/indications of trouble. 8/9/12 car would barely go 10 miles per hour leaving the hotel, would stop forward progress of any kind if I stopped, had to put in park, turn off car and turn on again. Had to cross 4 lane highway, but could not get car to move forward fast enough to clear all 4 lanes and middle divider. Took it in 2 green light tries and pulled into gas station (1/2 mile from hotel), gave car a rest, filled gas and same problem when started again. Had to call tow truck and bring to local Jeep dealer, 7 hours waiting at dealer to be told we had an early major transmission failure and it would be 8/13 before it would be ready. Rented a car to continue our vacation. $3,934.73, transmission repaired, failure occurred at 41,138 miles, Chrysler admits it is an early failure (and states we are out of all warranties), ms dealer states early failure and powertrain should be covered, contact Chrysler when we get home and local dealer here states 5/50000 on powertrain. Chrysler refuses to reimburse more than $1500 which we have not accepted and refuses to acknowledge 5 year/50,000 mile power train warranty. Had this failed while driving at highway speeds it could have caused an accident for ourselves and others. Chrysler has not called to this day the repair dealership to understand why the transmission failure occurred. We were told the oil had burnt by the dealership? there was plenty of transmission fluid, it was just burnt. We are writing to you to bring this potential safety issue with early transmission failure to your attention and to ask what exactly is the NHTSA/dot regulations regarding power train coverage/failures and what recourse we may have. Thank you for any information you can provide.

- Temple, TX, USA

2008 Jeep Grand Cherokee stalls at high speeds and intermittently while driving. Dealer unable to fix thus far ( has car for almost 30 days). In addition, same thing happened on my 2007 model and has happened to a number of people I know with Jeep Grand Cherokee. Internet is filed with reports of same events happening at random. Mine stalled at 65 mph - all electric, radio, flashers, everything just goes out. Very scary and very unsafe. Please evaluate.

- Manhasset, NY, USA