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  #13  
Old 01-14-2014, 03:05 PM
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Re: 2014 Jeep grand cherokee summit rolls in park

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Originally Posted by Summit View Post
I agree that moving forward, I need to make sure that I engage the parking brake at all times....maybe not even just on significant inclines. But this is the first vehicle that this has ever happened with. I have had 8 cars in the last 12 years...how is this the first time the issue came up...have I just been lucky so far? Chrysler did escalate this and they made this a severe issue at the dealership. I have a loaner car for a few day so will have to see what happens. The service manager believes that it could be a sensor issue.
Although the parking brake should be used, the transmission should not be allowing movement in park. Well, not without a LOT of noise being generated if the incline is too steep. The parking brake helps keep from damaging the transmission when some doofus wants a closer look at your front or rear bumper and is extremely nearsighted.
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  #14  
Old 01-14-2014, 05:59 PM
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Re: 2014 Jeep grand cherokee summit rolls in park

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Originally Posted by lstowell View Post
Although the parking brake should be used, the transmission should not be allowing movement in park.
Unless there is ice or another low-traction situation. The transmission can do all it wants to lock the output shaft, but the open differentials can still let things spin.

...tom
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Old 01-16-2014, 07:57 PM
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It's a good idea to pull your parking brake lever every so often, even if you don't normally use it or park on inclines. This will keep everything free and moving and not seized up, insuring that it will work when you really need it.
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Old 02-14-2014, 10:45 AM
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Re: 2014 Jeep grand cherokee summit rolls in park

What came of your service visit. Mine did this very same thing yesterday. Looked outside and it was in the road. Very slight incline. I typically use my parking brake, but had not yesterday. Was able to replicate this. It was not sliding, but rolling backward.

I consider this a very serious safety issue, regardless of whether one is supposed to use the parking brake. I have two young children - first thing I thought about.

Quote:
Originally Posted by Summit View Post
Am very worried about my vehicle. Just under 7k miles. Had parked outside in -0 temps parked on 30-35 degree incline. After placing in park, turning off, it rolled all the way down driveway. I thought was due to ice but I had my wife verify tires were spinning even while in park. After it rolled reverse, I backed car onto driveway and it also rolled forward as well. I drove 45 miles and When I got home no longer doing it. I have two small kids, very worried to have them around it. I used my iPhone for proof it happened but I am worried dealer will not be able to replicate. In for service tomorrow, anyone else have the same issue?
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Old 02-14-2014, 11:47 AM
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Re: 2014 Jeep grand cherokee summit rolls in park

please keep me updated on your vehicle

I also have 2 young children. My vehicle has attempted vehicular manslaughter on me, I worry about my kids. I worry about what if just once i forget to hit the parking brake and then it rolls back on them. I arrived home from hunting one day with a friend of mine. I parked it in my driveway, put the car in park, and turned the car off. I opened my door and then all the sudden the door was on top of me. It ran over me as it rolled down the driveway...all while my friend was screaming like a girl in the passenger seat. But i think about what if, what if someone was walking on the sidewalk, what if a car was coming up the street and it slammed in to the passenger side of the car?

Well it has been 1 full month now. It was at the dealership for a full week. They could not replicate the issue, but they did not test it on a grade. The dealership believed that there was an issue so Jeep agreed to install a limited slip differential vs the open wheel and then offered an extended warranty. just heard back Monday that due to my car being the v6, the limited slip is not compatible. so now waiting to hear back on what my options are...
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Originally Posted by GoHerd View Post
What came of your service visit. Mine did this very same thing yesterday. Looked outside and it was in the road. Very slight incline. I typically use my parking brake, but had not yesterday. Was able to replicate this. It was not sliding, but rolling backward.

I consider this a very serious safety issue, regardless of whether one is supposed to use the parking brake. I have two young children - first thing I thought about.
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  #18  
Old 02-14-2014, 07:02 PM
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Re: 2014 Jeep grand cherokee summit rolls in park

I can't begin to understand this logic. You have safety concerns, yet the one simple tool you have available, applying the parking brake, is not part of your regular procedure when parking a car.
I understand that the car should not be moving so easily compared to the gradients you are saying, however, any car being but into Park is not secure until the parking brake is applied. As such if you are seriously concerned about your kids, yourself and others, then why the hell are you not applying the park brake always.

Would you have the kids in the car without the seatbelt, I would hope not, so don't leave the car in park without the parking brake on.
It is illegal in this country and I know most states in the US to leave your car without it in park for this very safety reason, you are putting other peoples lives at risk.

Car should not be moving so easily but you should not ever be leaving any car without applying park brake.
Hopefully they can eventually find why it is moving so easily.
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  #19  
Old 02-14-2014, 07:53 PM
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Quote:
Originally Posted by tomk View Post
When in park, any single drive wheel on ice will allow the vehicle to roll, with the other drive wheel(s) turning (and the slipping drive wheel turning backwards). If it is a 4x2, then of course the front wheels will be rolling..

So, if there is ice about, seeing the vehicle rolling with the wheels turning doesn't always mean that the park lock has failed.

...tom
Sage.

My guess is that only one wheel slipping is required even on the 4x4 JGC due to the intricacies of the drivetrain. I'd test this before making fact of it though.

Without casting a stone, I wonder if inappropriate tyres are contributing?

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  #20  
Old 02-16-2014, 10:33 AM
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Re: 2014 Jeep grand cherokee summit rolls in park

This exact issue has been documented on Chev Astro/GMC Safari's as well. It's the awd t-case which is the culprit. And as much as I hate to admit it, using your emergency brake is the only way you'll ever trust your truck again.

Having said that, I never use mine either. I cycle it 2-3 times a month to keep her from seizing, but that's it.

That may change now, judging by this thread....
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