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Old 02-20-2015, 03:30 PM
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Engine/Transmission Issues

I have a 2014 Jeep Grand Cherokee Limited. Bought it brand new and never had any issues until it hit 11000 miles.

Check engine light has been on 3 times (different sensors), back up camera went out and about 4 or 5 months ago the Jeep starts to shake/vibrate when coasting or accelerating. It started out just 6th gear. If I were doing 45+ and it was in 7th gear when I would slow down and accelerate it would hesitate and start shaking/vibrating. Well now it is doing it in 3rd through 8th gear. At times it feels like either the engine or transmission is going to come out.

I have had it at the dealership 5 times for the engine/transmission issue. 2 updates to the transmission were done. One of the mechanics put that it was a normal characteristic of the vehicle. That didn't go over to well when I picked it up.

I have been in contact with Jeeps Resolution center about the issue. They are useless. I was told by the lady at Jeep that she could not replace/repurchase the Jeep until the dealership had another Jeep GC come in with the same issue so there is a STAR case open until one is found.

I have contacted a lawyer for assistance on getting it filed through the lemon law in Virginia and waiting to hear back from him. I regret purchasing this POS. I will never buy another vehicle manufactured by Chrysler and I would not take one if they gave it to me for free.

Anyone with the same Jeep having the same issues?

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Old 02-20-2015, 03:38 PM
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Re: Engine/Transmission Issues

Oh BTW its a 5.7L
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Old 02-22-2015, 12:12 AM
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Re: Engine/Transmission Issues

Are you sure you're not just feeling MDS in operation? It'll happen during light throttle operation, kind of like what you're describing. You'll feel it most during lower speed, low RPM situations (50mph or under) and it'll feel like a vibration. If you press the accelerator harder, it'll stop.

If that's what you're feeling then it's normal MDS operation and all the 5.7L engines do it. FYI, MDS deactivates 4 out of the 8 cylinders under light load in order to save fuel. Because of the firing imbalance, you'll feel a vibration while its in that mode. Kind of a rumble. There's no way to balance that out so it's considered normal.

One thing you can do if it bugs you is turn off ECO mode. While MDS will still come on, the system will be less aggressive in using it.
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Old 02-22-2015, 08:43 AM
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Re: Engine/Transmission Issues

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Originally Posted by Peter_K View Post
Are you sure you're not just feeling MDS in operation? It'll happen during light throttle operation, kind of like what you're describing. You'll feel it most during lower speed, low RPM situations (50mph or under) and it'll feel like a vibration. If you press the accelerator harder, it'll stop.

If that's what you're feeling then it's normal MDS operation and all the 5.7L engines do it. FYI, MDS deactivates 4 out of the 8 cylinders under light load in order to save fuel. Because of the firing imbalance, you'll feel a vibration while its in that mode. Kind of a rumble. There's no way to balance that out so it's considered normal.

One thing you can do if it bugs you is turn off ECO mode. While MDS will still come on, the system will be less aggressive in using it.

Are you sure the MDS activates when not in ECO mode? I opt out of ECO a lot, choosing to control the shifts and the gear it's in, especially when I'm not on an interstate. I've never felt/heard the MDS come on or go off when not in ECO.
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Old 02-22-2015, 09:52 AM
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Re: Engine/Transmission Issues

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Originally Posted by Lightninrod View Post
Are you sure the MDS activates when not in ECO mode? I opt out of ECO a lot, choosing to control the shifts and the gear it's in, especially when I'm not on an interstate. I've never felt/heard the MDS come on or go off when not in ECO.

On the 2014s and 2015s it does -- it's just much less aggressive about it. Generally only during higher-speed cruise or deceleration when ECO is off from what I've been able to tell (using a scan tool to verify).
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Old 02-22-2015, 11:35 AM
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Engine/Transmission Issues

I was wondering if that vibration/rumble was normal. It happens when eco is on and i'm following a slower car: when I slowly accelerate, there is a rumble ( as if the transmission should go down 1 speed) until I give it a bit more gas. There is no change in transmission but the rumble goes away. Thanks for the MDS explanation!

BTW, I'm getting TSB 21-003-15 done next Tuesday, hopefully Eco mode will stay off from one start to the next.


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Old 02-23-2015, 08:02 AM
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Re: Engine/Transmission Issues

I took a service manager for a ride because the mechanics at the dealership either don't know what they are doing or are just taking my Jeep out for a joy ride. The service manager mentioned something about the ECO mode so we turned it off and it didn't help at all.

The only time that I don't get the vibration/shaking is when it is in sports mode or I'm changing the gears with the paddles.

If Jeep/Chrysler considers that as normal/normal characteristic then why did it not do it when it was brand spanking new off the lot? Had the issue been there when I took it for a test drive I would have took it back to the dealership, parked it and said no thanks I will go back to Nissan/Ford.

Its a shame that such a sexy vehicle is such a POS. It is the best looking SUV around I think.

I am waiting to see what that bright stupidvisor at Jeep says when she calls. I have already contacted a lawyer.
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Old 02-23-2015, 09:14 PM
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Re: Engine/Transmission Issues

The fact that you don't get the vibration in Sport mode or when using range select (paddle shifters) really tends to point to it being normal MDS operation. In both of those situations, MDS is disabled.

MDS will still activate in "Normal" vs ECO mode -- it'll just be less aggressive with it. Depending on your driving style you may still notice it.

The PCM software does tend to limit MDS operation a bit during the first few hundred/thousand miles to assist with engine break in. I noticed mine didn't really start to engage it a lot until I had some miles on the vehicle. This is normal as well.

If you start viewing the MDS operation as normal, you'll realize it's a fuel-saving feature. Yeah, the rumble can be annoying, but you get used it it.

Alternately, there are tuners out there (such as from DiabloSport) that can be used to change the settings in the PCM to permanently disable MDS operation. I played around with that for a while and yes...no more rumble/vibration. But...you DO take a notable hit in gas mileage.
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Old 03-09-2015, 07:45 PM
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Engine/Transmission Issues

Quote:
Originally Posted by Jeepsucks View Post
I took a service manager for a ride because the mechanics at the dealership either don't know what they are doing or are just taking my Jeep out for a joy ride. The service manager mentioned something about the ECO mode so we turned it off and it didn't help at all.

The only time that I don't get the vibration/shaking is when it is in sports mode or I'm changing the gears with the paddles.

If Jeep/Chrysler considers that as normal/normal characteristic then why did it not do it when it was brand spanking new off the lot? Had the issue been there when I took it for a test drive I would have took it back to the dealership, parked it and said no thanks I will go back to Nissan/Ford.

Its a shame that such a sexy vehicle is such a POS. It is the best looking SUV around I think.

I am waiting to see what that bright stupidvisor at Jeep says when she calls. I have already contacted a lawyer.

so where do you stand as of today with your case? I'd love to chat some more about what you've been through.

I myself am having ongoing electrical problems with my gauge cluster flashing everyone warning message in the book at me while driving and transmission shifting issues (shifting into neutral when it feels like and erratic/harsh shifting).

All of this has been documented with jeep customer service and their resolution team dating back to November of last year. I was told by a customer service rep that my "my file was bigger than any other file he has seen for a grand Cherokee" Mind you I only got the car in August!! and I only have 3k on the odo. The last time it was in the shop for 6 consecutive weeks with NO resolution to my problem. The best part about the whole situation had to be when my service manager walked out to the car to show me that "nothing was found and all was well" the entire gauge cluster went off right in his face... he turned beat red and said "I guess your keeping your loaner until we figure this out." On the 6th week I got a call to pickup the car because they reproduce the problem. I was forcibly given the car back and told the star department recommends giving the car back to me to "drive until it happens again."

I'm at a total loss for words!! I want out of this pile of $hit and to get something other than a Chrysler product. I lost all faith and trust in these GC's.

Guess it's time to make the call to my lawyer for lemon law buy back and get all my money back.


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