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Unread 05-01-2011, 11:26 PM   #31
lagonwagon
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2007 WK 
 
Join Date: May 2010
Location: Mesa, AZ
Posts: 341
Quote:
Originally Posted by kentman View Post
Replaced my front differential solenoid, and that cured my Service 4WD System light issues. It was a $23 part. I did it when swapping the front differential fluid.
Did you just now fix that problem? I'm already on my second Service 4WD System light.

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Unread 05-02-2011, 05:22 AM   #32
kentman
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2006 XK Commander 
 
Join Date: Jan 2004
Location: Wilmington, NC
Posts: 1,432
I fixed my issue on April 3, about four weeks ago. I had reached 15K on my differential fluid, and it was time to do the fluid swap. I was working to swap out the pinion bushing to try to rid myself of a front end clunk. After completing that swap, I cracked open the front differential cover to do the fluid and replace the solenoid. When I buttoned everything back up, my error message disappeared, and it has been gone for a month now.

Good new / bad news was that my message was cleared, but my clunk remains. I swapped the sway bar bushings this weekend hoping to impact the clunk, but the clunk remains.

My gut feeling is that the clunk is ball joint or steering rack related.
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Unread 05-04-2011, 11:17 AM   #33
david_ak
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2005 WK 
 
Join Date: May 2011
Location: Crofton, MD
Posts: 1
I've had the service 4wd light issue for probably three years now. Just a month ago I finally took it in (along wit the TSB) to have it flashed. I month went by before the warning light came back on. $100 wasted.

What I haven't seen mentioned in the threads here; about 97% of the time my Jeep displays the message when it's warm out, above 75F. Rarely does it come on in the winter.

Now that I've given the Jeep to my parents, I want to get the issue fixed. Any suggestions for where to start?

Check grounds (where?)?
Replace the solenoids?

Thanks!
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Unread 05-04-2011, 11:25 AM   #34
lagonwagon
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2007 WK 
 
Join Date: May 2010
Location: Mesa, AZ
Posts: 341
Quote:
Originally Posted by david_ak View Post
I've had the service 4wd light issue for probably three years now. Just a month ago I finally took it in (along wit the TSB) to have it flashed. I month went by before the warning light came back on. $100 wasted.

What I haven't seen mentioned in the threads here; about 97% of the time my Jeep displays the message when it's warm out, above 75F. Rarely does it come on in the winter.

Now that I've given the Jeep to my parents, I want to get the issue fixed. Any suggestions for where to start?

Check grounds (where?)?
Replace the solenoids?

Thanks!
Check out the 12th post on the 1st page of this thread.
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Unread 08-22-2011, 03:17 PM   #35
egaff
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2009 XJ Cherokee 
 
Join Date: Aug 2011
Location: Smithtown, New York
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Just brought in my 09 Gr Cher for oil change, tire rotate, air filter, coolant flush. and trans flush. Since getting it back, the car has message Service 4WD system. also it rolls when starting in Park, does'nt move with wheel turned all the way right or left when backing up. gear shifting feals funny, went into 4wd low on its own. expireanced a loud bang when excelerating onto highway. Still under Warr bringing it in this week.
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Unread 08-23-2011, 10:01 AM   #36
05HemiWK
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Does anyone have the part numbers for the front and rear solenoids?

I have the Service 4WD light on too, and my aftermarket warranty wont cover it, so looks like i'm going to be replacing them myself. My light has been on for MONTHS, and no issues to report so far, the service writer at my stealership said its common for just the light to come on after the 60-70K mile mark. . . i smell BS, BUT i haven't had any problems with the jeep while the lights been on and i took it offroad a few times including pulling my boat and trailer out of a sticky situation while @ the lake.
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Unread 08-23-2011, 01:30 PM   #37
mrtosh
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2005 WK 
 
Join Date: Aug 2006
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52114003AD same part number front and rear.
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Unread 09-24-2011, 12:35 PM   #38
RocknWK
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Quote:
Originally Posted by egaff View Post
...the car has message Service 4WD system. also it rolls when starting in Park, does'nt move with wheel turned all the way right or left when backing up. gear shifting feals funny, went into 4wd low on its own. expireanced a loud bang when excelerating onto highway..
These are my exact same conditions. Started acting fully a month ago at 53k miles. I'll likely change fluids and solenoids to see if that fixes anything. Needs to be done anyway.
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Unread 09-24-2011, 01:42 PM   #39
OtsiderCherokee
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Join Date: Mar 2005
Location: Wherever I May Roam, Kansas
Posts: 98
Mine started giving me this indicator earlier this week. I had a friend hook up his Snap On code scanner to it and it is not showing any codes. Unhooking the battery for a few minutes had not effect on this at all, other than showing up on the scan my friend ran.

I hate electronic crap...
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Unread 09-24-2011, 04:38 PM   #40
RocknWK
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Quote:
Originally Posted by RocknWK View Post
These are my exact same conditions. Started acting fully a month ago at 53k miles. I'll likely change fluids and solenoids to see if that fixes anything. Needs to be done anyway.
Just back from the dealer with a box full of fluids and parts. The front differential actuator is a slightly different part number than quoted earlier in this thread and cost me $50.20 before taxes. New part number is 52114003AF. I will be changing fluid and installing the actuator tomorrow in hopes it fixes my problems.
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Unread 09-24-2011, 04:59 PM   #41
OtsiderCherokee
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Have any of you that had this issue had it scanned and not had any codes show up?
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Unread 09-24-2011, 06:49 PM   #42
boykinjw
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1997 TJ Wrangler 
 
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Location: VA
Posts: 200
Had it show up with no codes on an autozone reader. But the dealer pulled a code with their "star" system. Maybe it digs a little deeper
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Unread 09-24-2011, 11:43 PM   #43
RocknWK
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2006 WK 
 
Join Date: Dec 2010
Location: Rocklin, Ca
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Quote:
Originally Posted by RocknWK View Post
Just back from the dealer with a box full of fluids and parts. The front differential actuator is a slightly different part number than quoted earlier in this thread and cost me $50.20 before taxes. New part number is 52114003AF. I will be changing fluid and installing the actuator tomorrow in hopes it fixes my problems.
Here's an update: I pulled my front diff cover today after picking up the diff fluid, friction modifier, sealant, and actuator solenoid. I pulled the cover and removed the original actuator. Unfortunately, the wires on the actuator connector were extremely brittle and the wires broke at the connector while disconnecting it. I ran back to the dealer and picked up the 21 dollar harness and installed it with no problem. The wires were a bit longer and I hope they won't get caught up inside the differential. Should be ok.

I reassembled the diff and added the synthetic fluid and friction modifier, then buttoned up everything. This is a fairly simple job but it is fairly dirty and time consuming, so plan on a couple of hours minimum. It was late when I finished so I did not test drive to see if the 4 wheel drive warning message still appeared. I wanted the sealant to set up overnight anyway.

Helpful hints:
The top three 5/8" diff bolts are difficult to reach. I was able to get to them with a short socket and a breaker bar, but I suggest a 5/8" swivel head gear wrench.

Buy the wiring harness along with the actuator solenoid. the connector is brittle and difficult to remove and chances are you'll need a new harness anyway.

Use quality RTV on for the cover. I bought the orange Mopar sealant and it worked great.

Follow the proper torque sequence while tightening the cover bolts. Torque two the bolts over two or three passes and don't over tighten.

Use a clear 1/2" hose on the top of the diff fluid bottle while filling the case. I tried a 1/4" hose and gave up after spilling fluid everywhere. I ruined a good T-shirt from my Alaska vacation ha ha.
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Unread 09-26-2011, 02:00 PM   #44
RocknWK
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2006 WK 
 
Join Date: Dec 2010
Location: Rocklin, Ca
Posts: 23
Quote:
Originally Posted by RocknWK View Post
Here's an update: I pulled my front diff cover today after picking up the diff fluid, friction modifier, sealant, and actuator solenoid. I pulled the cover and removed the original actuator. Unfortunately, the wires on the actuator connector were extremely brittle and the wires broke at the connector while disconnecting it. I ran back to the dealer and picked up the 21 dollar harness and installed it with no problem. The wires were a bit longer and I hope they won't get caught up inside the differential. Should be ok.

I reassembled the diff and added the synthetic fluid and friction modifier, then buttoned up everything. This is a fairly simple job but it is fairly dirty and time consuming, so plan on a couple of hours minimum. It was late when I finished so I did not test drive to see if the 4 wheel drive warning message still appeared. I wanted the sealant to set up overnight anyway.
Update to the update: I drove the WK all weekend and have had NO 4wd system warning light since replacing the actuator and wiring harness. I'm also happy to report my front diff cover is not leaking either. I generally hate RTV sealant but the orange MOPAR stuff worked well.
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'99 Cherokee Classic (modified)
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Unread 01-05-2012, 01:13 PM   #45
LelandGray
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2005 WK 
 
Join Date: Aug 2010
Location: Tulsa, OK
Posts: 89
Quote:
Originally Posted by RocknWK View Post
Buy the wiring harness along with the actuator solenoid. the connector is brittle and difficult to remove and chances are you'll need a new harness anyway.
I know this is pretty old, but do you know the part number for the wiring harness??

I have the same 4WD service needed message and have been told I need to replace my solenoid, and I might as well get the wiring harness while I'm doing it.
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