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-   -   QL issue (http://www.jeepgarage.org/f107/ql-issue-70144.html)

pensfan414 01-08-2014 10:32 AM

QL issue
 
We've had some bitter cold here last few days, and today driving to work I received the "service suspension immediately" notification. Suspension stuck in aero mode. I've had no problems with it up to this point. Could the temp have anything to do with this? Thanks.

bill_de 01-08-2014 10:54 AM

Re: QL issue
 
This is not specifically your problem, but does indicate that temperature can have an effect. From WK2Jeeps.com.



"When the air suspension compressor has to run for a significant period of time or the air suspension system is being used a lot by the driver, the compressor may need to cool down. This is normal and should not require service. There are times when the system will need to make up a significant amount of air. This can occur with large changes in ambient air temperature or if service has been done on the system and lost air has not been replaced.
A message will be displayed on the EVIC indicating the compressor is cooling down and there will be a diagnostic trouble code (DTC) set. The DTC in the ASCM module does not necessarily indicate service is needed. If the EVIC message and DTC occurs often, it may be an indication of a leak in the system."

lstowell 01-08-2014 11:26 AM

Re: QL issue
 
Quote:

Originally Posted by bill_de (Post 956609)
This is not specifically your problem, but does indicate that temperature can have an effect. From WK2Jeeps.com.



"When the air suspension compressor has to run for a significant period of time or the air suspension system is being used a lot by the driver, the compressor may need to cool down. This is normal and should not require service. There are times when the system will need to make up a significant amount of air. This can occur with large changes in ambient air temperature or if service has been done on the system and lost air has not been replaced.
A message will be displayed on the EVIC indicating the compressor is cooling down and there will be a diagnostic trouble code (DTC) set. The DTC in the ASCM module does not necessarily indicate service is needed. If the EVIC message and DTC occurs often, it may be an indication of a leak in the system."

After a few days of below zero, mine offered to go UP from aero mode, but then as the ice piled up, it wouldn't go to park mode till I flushed the ice with warm water and power washer.

TurboRush 01-08-2014 12:49 PM

Re: QL issue
 
I've read a hand full of posts else where of individuals that have experienced issues with extreme cold and the QL not wanting to go up or down (within the past couple of days). All reported once it "warmed" up things returned to normal.

Guess with this polar vortex and the extreme cold we are starting to see the kind of havoc it can cause on various systems.

pensfan414 01-08-2014 05:30 PM

Update, after it warmed up to a balmy 20 degrees QL worked fine. Very strange.

chdavis 01-09-2014 05:43 PM

Re: QL issue
 
I had the same exact problem this morning. Started the car and after a few minutes I got an error message in the EVIC saying "Air Suspension Failure - Immediate Repair/Service Required". Definitely not comforting to see at the start of my commute. I didn't notice a change in the ride height or overall drivability so I pressed on.

A few things I noticed:

1) I didn't hear the compressor cycle on whatsoever.

2) The system held the ride height and air pressure without issue.

3) There were none of the typical QL warning sign of an impending QL failure (increased compressor activity to compensate for leaks/low pressure, ect.)

Initially, I suspected the fuse for the air suspension circuit had blown. Rather than fiddle around with a sophisticated system (and one of which I'm not too familiar with), I scheduled an appointment with Jeep to bring in the car around noon.

To my amazement, the QL system was fully operational when I started it up to drive to the dealer for my appointment. No symptoms of the earlier issue, no fault message in the EVIC, and no deficiencies in the system's performance. :confused: I was relieved as I really couldn't afford the time of leaving the office today.

Obviously, the QL system is affected by extremely cold temperatures. I can't say if the behavior a few of us have observed is by design or by a design oversight. There is a TSB issued for the QL system in which our symptoms are sort of mentioned - and it could very well be intended to rectify our exact problem - but the language used is ambiguous, at best. I'm planning to bring in my GC to the dealership this week to have the stored QL diagnostic fault codes read by their equipment and I'll report back. I'm also going to insist they perform the previously referenced TSB.

Chris

lstowell 01-09-2014 06:09 PM

Re: QL issue
 
Quote:

Originally Posted by TurboRush (Post 956668)
I've read a hand full of posts else where of individuals that have experienced issues with extreme cold and the QL not wanting to go up or down (within the past couple of days). All reported once it "warmed" up things returned to normal.

Guess with this polar vortex and the extreme cold we are starting to see the kind of havoc it can cause on various systems.

It could be the nitrogen supply is low, as I don't think any of the temps hit liquid nitrogen range even though it felt like it.

Once I flushed all the ice out from under the vehicle, it would move up and down nicely at below zero temps, rising from park/entry and dropping into aero and out.

Supertech30 01-11-2014 02:07 AM

I have had mine in two times for this and it is going in for the third on Monday. The tech is pulling trouble codes off the system but cannot find anything wrong. He did a software update this last time that did nothing. The colder it is the sooner it comes on at this point everything is pointing to another software glitch.

Sent from my Nexus 7 using Tapatalk

TurboRush 01-13-2014 01:12 PM

Re: QL issue
 
Came across this some place else. For the pre-2014 folks and it specifically mentioned extreme cold:

SERVICE BULLETIN NUMBER: 08-034-12
GROUP: Electrical
DATE: May 10, 2012
SUBJECT:
Flash: Service Air Suspension Message And/Or U0415-00 And/Or C159E-15 Set
OVERVIEW:
This bulletin involves reprogramming the Air Suspension Control Module (ASCM) with new software.
MODELS:
2011 - 2012 (WK) Grand Cherokee
NOTE: This bulletin applies to vehicles equipped with Quadra-Lift (TM) Air
Suspension (sales code SER) built before May 1, 2012 (MDH 0501XX).
SYMPTOM/CONDITION:
The customer may experience a “Service Air Suspension” message. Upon further
investigation the Technician may find that U0415-00 Impliable Data Received From
Anti-lock Brake System (ABS) or C159E-15 Air Pump Temperature Sensor has been set active or stored.
Also if the vehicle is driven in extremely cold temperatures (-30C/-22F) the ASCM should be updated with the new software. The new software will allow the air compressor to continue to operate until -40C/-40F.
Updating the software will correct the conditions listed above.

Supertech30 01-13-2014 01:18 PM

Re: QL issue
 
Mine is a 2014 but I will take this in with me tonight anyway thanks TurboRush

TurboRush 01-13-2014 02:05 PM

Re: QL issue
 
Quote:

Originally Posted by Supertech30 (Post 959144)
Mine is a 2014 but I will take this in with me tonight anyway thanks TurboRush

There IS a flash out there for the 14s but it doesn't talk about cold weather operation. Just addresses the display of "suspension cooling" or when it appears to get stuck lowering or raising but it really isnt: http://www.wk2jeeps.com/tsb/tsb_wk2_0808213.pdf

Supertech30 01-13-2014 03:11 PM

Quote:

Originally Posted by TurboRush (Post 959169)
There IS a flash out there for the 14s but it doesn't talk about cold weather operation. Just addresses the display of "suspension cooling" or when it appears to get stuck lowering or raising but it really isnt: http://www.wk2jeeps.com/tsb/tsb_wk2_0808213.pdf

I had that one done last week it didn't fix it.

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