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  #109  
Old 09-20-2016, 11:24 AM
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Re: Quadra Lift Air Suspension Failure

I have a 2015 jeep Grand Cherokee, 3.0 fiat ecodiesel with the aforementioned air suspension problem. The vehicle has 30k miles on it. It is back at the dealership now. A "star case" was opened the last time the vehicle was in the dealership. Including the original control module, it is about to get its fourth control module. In other words, this is the third time it is in the dealership for a new control module. I have a "case worker" assigned. The service dept admits to me quietly that they have 5 of these coming in regularly right now and all of them are Grand Cherokees. There is still no real fix for the problem. The air suspension has nothing mechanically wrong with it. Each time it is in the dealer garage, they spend a week testing it and finally just replace the control module which appears from my ignorant perspective to reset the computer system so the air suspension system is again functional. The system will keep failing. Every failure happens in this order: 1)use the system to raise the vehicle for off road or high water or whatever. 2)days or weeks later, when I turn the vehicle on, there is a brief grinding/grating noise, the ASS light comes on (air suspension system which I like to call the ASS), and the air suspension system is disabled. 3)it is tested for a week and no problem is found 4)control module replacement resets it to work again for a while before the above process occurs again. The failure weirdly always happens at start up of the vehicle and isn't immediately preceeded by use of the system. Jeep still has no real repair, still isn't admitting a general problem, still isn't recalling, etc

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  #110  
Old 09-20-2016, 11:52 AM
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Re: Quadra Lift Air Suspension Failure

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Originally Posted by wmbwinn View Post
I have a 2015 jeep Grand Cherokee, 3.0 fiat ecodiesel with the aforementioned air suspension problem.
There were a lot of complaints about the system pre MY14. Since then it has been pretty quiet.

If this happens again, before you bring it to the dealer try disconnecting the battery for about 15 minutes. I'm pretty sure they do this when they change the module. But it could be it is disconnecting the battery that is resetting the system. If so, you might be able to point the experts in a different direction.

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  #111  
Old 09-20-2016, 01:15 PM
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Re: Quadra Lift Air Suspension Failure

Thanks. Currently it is back in the dealer service garage. About to get another control module
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  #112  
Old 09-20-2016, 03:56 PM
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Re: Quadra Lift Air Suspension Failure

They opened another "star case" and the "Chrysler engineer" has been notified again to seek advice. Apparently the engineer decides whether to "repair" or not. I put repair in quotes because repair means replace the control module again which doesn't fix anything other than to reset the system to function until the next failure. The service dept told me they have another new case in also. So, now a smaller more rural market has 6 jeep Grand Cherokees coming in with the "service the ASS immediately " light on... (ASS is my joke, air suspension system).
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  #113  
Old 09-20-2016, 04:09 PM
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Re: Quadra Lift Air Suspension Failure

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Originally Posted by wmbwinn View Post
They opened another "star case" and the "Chrysler engineer" has been notified again to seek advice. Apparently the engineer decides whether to "repair" or not. I put repair in quotes because repair means replace the control module again which doesn't fix anything other than to reset the system to function until the next failure. The service dept told me they have another new case in also. So, now a smaller more rural market has 6 jeep Grand Cherokees coming in with the "service the ASS immediately " light on... (ASS is my joke, air suspension system).
If you get a chance ask him the model years of the others.

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  #114  
Old 09-24-2016, 09:05 PM
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Re: Quadra Lift Air Suspension Failure

My 2014 summit went in with an ASS service alarm. The issue was the two front undocumented nonreturn valves (NV),that exist at each strut. They are there in case of a line rupture and prevents a catastrophic drop in height. They only found out about their existence from the RAM truck schematics and also found the parts from the truck data base. These NVs where preventing nitrogen flow in my case. Once removed, everything worked great. New valves are on order but right now driving with them removed and no issues.
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  #115  
Old 09-27-2016, 11:01 AM
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Re: Quadra Lift Air Suspension Failure

2011, 2012,2013,2014 are the years of the other jeep Grand Cherokees that are coming in to this dealer outside of Dallas. This time, the Chrysler engineer had them replace the compressor and the control module. They are once again confident it is fixed. If the problem was fixed since the 2014 manufacturing changes, then perhaps the 2015 I have has older parts installed? Don't know. Will stay on board to report as this goes along. The dealer bill this last time was over 2k dollars but I am warranty covered and my cost is zero. Dealer spending more monthly than I am in monthly payments....
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  #116  
Old 09-27-2016, 11:36 AM
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Re: Quadra Lift Air Suspension Failure

Very bad topic. I need to unsubscribe from this one. I have a 2012 Overland and no problems. Reading here makes me want to sell.
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Old 09-27-2016, 11:41 AM
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Re: Quadra Lift Air Suspension Failure

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Originally Posted by 2string1 View Post
Very bad topic. I need to unsubscribe from this one. I have a 2012 Overland and no problems. Reading here makes me want to sell.
Trading in my 2014 overland this week as the warranty just ended and I'm terrified of anything that might happen. Had to get the compressor and control module replaced under warranty, and one of the height sensors in the wheel well was corroded too
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  #118  
Old 09-27-2016, 11:50 AM
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Re: Quadra Lift Air Suspension Failure

Don't know what to do... I love my JEEP... Thinking of buying a Honda Ridgeline Black Edition...
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  #119  
Old 09-27-2016, 12:29 PM
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Re: Quadra Lift Air Suspension Failure

Jadam, did the compressor replacement with control module stop yours from malfunctioning?
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  #120  
Old 09-29-2016, 10:41 PM
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Re: Quadra Lift Air Suspension Failure

I actually had to bypass my system when it crapped out 600 miles from home in Colorado. No dealers in Denver or nearby would look at it but did tell me it would be expensive and that I couldn't add air to get it out of the low rider position and get home. I actually had to take off the lower bumper to keep it from getting ripped off and it rode like crap. I finally went to a couple hardware stores and found the Vail Valley Ace Hardware had enough fittings to try it. The front was the easy part, took the air hose fitting out and replaced with 1/8" Schrader valves, had to do this on each side. The rear though was more difficult. I had to remove both rear wheels in order to get to the air fittings. I removed each one and replaced with an elbow with 1/8" pipe threads going into the bag and 3/16" compression fitting. I would have gone smaller on the tubing because the smaller the diameter, the more pressure it will withstand but this was the smallest they had. I joined the two sides into a compression T-fitting and ran the fill line to a Schrader valve I ziptied to the hitch. I hooked the compressor to it and it didn’t move. Oh Crap! Then I jacked the front up and aired it to the 60 psi the compressor would go to, set it down and it was higher. Did the same with the rear and it was a little higher. Now off to find higher air pressure. Luckily right across the highway was the Vail Conoco with two awesome mechanics on staff that were more than willing to help me out. They had 150psi air system at hand. I aired up the front to about the OR1 setting height, a little higher than normal ride height. It pegged out their 120 psi air gauge, guessing about 130 to 140psi. The 3/16 line I installed on the rear was listed as 130psi max at 75 degrees, Uh Oh. I put about 110 in it and it was pretty level. Measured all four corners and rechecked the next morning. One front one was a little lower so I tightened the fitting a little more, aired it back up and it held for two more days in Colorado (even a couple easy trails) and 600 miles back home. I could tell the back was a little looser in turns due to the air transferring from one bag to another. Separate fill lines would have eliminated that. When we got home I tore the compressor apart and found it had broken the piston. Dealer wanted $1,695 for a new compressor; I bought one online from Miessler Automotive for $580. You can’t fill the nitrogen tank yourself; it has a fitting that I couldn’t match up so I had to take to the dealer to fill it back up. Now to sell it and by a Wrangler. Love the Jeep Grand Cherokee Overland and thought the Quadra-Lift was the bomb but I am not going to get stranded and waste two days of my vacation again.
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