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  #25  
Old 09-09-2016, 01:46 PM
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Re: "Service 4wd" light

So I finally got around to taking the motor out and looking at it. The shaft was somewhat stiff to turn but not jamming in any way.

I looked up the numbers that were on the tag for the motor and could find nothing that matched up to it. The dealer part number 68084266AB that fits my 2011 I found on the internet fine. The lowest price I found was $288 (Dealer $662) from a mopar overstock type dealer.

When I was looking up the codes I had found some information about the measured circuit out of range C148F-1D and that it needed a flash, which I got back then. Thinking about the error I started to think that maybe the motor was just gummed up and the commutator and brushes were dirty causing it to draw higher than normal amperage through the circuit.

http://www.wk2jeeps.com/tsb/tsb_wk2_2100114.pdf

I took the 2 torx screws out of the cover and carefully slipped it off. The brushes are in the aluminum housing end and all that is on the other end is a small bearing that fits into the housing far end. The magnets are quite strong so be careful taking it off. I tapped both the housing and the cover lightly upside down with a small plastic mallet and tapped upside down on the flat of my vice, careful not to do it too hard. A lot of carbon dust and a couple of small bits like leftover plastic or carbon from the brushes fell out. The motor now spun nice and free by hand.

I attached a cordless drill to the motor and spun it while using commutator paper to sand the commutator back to a nice shiny copper and to re-seat the brushes. I blew out the housing and cover and wiped clean with a cloth inside. I reassembled it and the motor now spun pretty free with no binding or stiffness.

I did not put any lubricant into the bearings, they are sealed and felt ok to me, although those could probably be replaced as well.

I put it back into the vehicle, reconnected everything and the error condition was gone. It has not come back since and I can change driving modes without any issues.

I was pretty comfortable doing this as I had worked on electric forklifts a long time ago and had to clean the electric motors this was all the time. What else did I have to lose, I was queuing up to buy a new one anyway.

The difficulty level for both R and R as well as the cleaning was pretty low. Unless you try to pull the armature and circuit board out of the aluminum housing you really can't break anything more than it was. Just be gentle when cleaning it.

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  #26  
Old 11-04-2016, 10:20 AM
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Re: "Service 4wd" light

OK, to close the loop on this the repair I did, it lasted about a week and the light came on again. So I searched for and found the motor for my part number at the site below, very reasonable cost of $220 compared to the dealer and shipping was only $10. The part is on sale right now too for $10 less...shipping was fast too.

Mopar America
950 HWY 66 South
Kernersville, NC 27284

Mopar*Motor -*2011 Jeep Grand Cherokee - 68084266AB : Genuine Mopar Parts For Dodge Jeep RAM Chrysler

It's been over a month or so now and the light remains off and it driving great.
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  #27  
Old 11-16-2016, 10:33 AM
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Re: "Service 4wd" light

This is a god send if it works. I've been dealing with this "Service 4WD" for about a month and a half looking at various items under the Cherokee.
I have a little over 131,000 mile on my 2011 5.7 Overland and hope this will fix the issue.
Thanks for the write up, part number, and cheaper source for the part. :-)
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  #28  
Old 11-16-2016, 11:04 PM
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Re: "Service 4wd" light

I've had this exact issue (Serv 4WD, Esc Off, Check engine) come up intermittently recently. Local shop ran for codes and said there were none thrown. Check engine light was off at that time. Then just this week, there is suddenly a loud ticking coming from under the vehicle. Tap the gas, 10 ticks, then stop. Tap the gas, 10 ticks, then stop. Loud. And the front end feels like its locking up at full turn. Will actually stop the vehicle at full turn. I can give it gas and it will jerk on through a turn. Almost feels like when a front end locker is engaged (perhaps?). All while in normal driving mode.

I'd love for this to be just a transfer case motor at this point. And HUGE thanks to OP and all that contributed in this thread. Any ideas?

2012 Laredo 3.6L, 4wd, 92k miles
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  #29  
Old 11-17-2016, 04:51 PM
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Re: "Service 4wd" light

Maybe front wheel bearings and sensors?

I was thinking of just doing mine as well when I attack the front brakes. The front hub assemblies are relatively cheap, about $60 per side, and come with the wheel sensors. Another poster had mentioned bad wheel speed sensors could also trigger the ABS and SERVICE 4WD system error.

Luckily, I have not had a check engine light come on with the other two. I will try the ESLD motor first then move to the Wheel sensors?

Anyone have a part number and procedures for the ELSD Solenoid?
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  #30  
Old 11-22-2016, 10:35 AM
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Re: "Service 4wd" light

Wife's WK2 is now getting the SERV 4WD light intermittently. Dropping it off at the dealership today for a service appointment tomorrow. Will update.
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  #31  
Old 11-25-2016, 04:29 PM
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Re: "Service 4wd" light

Hello All,

I receive my motor a couple of days ago for $210 shipped after doing a search for the part number and found it at https://www.moparpartsdeals.com/oe-m...GPoaArav8P8HAQ

I finally had the time today to get under my Overland to do the replacement. I raised into the QL2 position and crawled underneath to review the connections. The connections looked good and secure. I disconnected the cables and moved to the other side to remove the 4 bolts. As Robey5 indicated, they came out easily and there was no sign of thread locker.

The motor came out easily by pulling out straight back, by the way, not a lot of room under there, especially for those with big hands.

After getting the motor out I tried to turn the shaft by hand and it wouldn't move, if I applied enough force I could move it a little, but definitely not as easily as the new motor. I also observed some wear on the output shaft gear.

I installed the new motor being careful not to drop or bump the new motor as the motor clearly states to scrap the motor if dropped. I reinstalled the 4 bolts to a little tighter than hand tight as I couldn't find torque specs. I reconnected the cables and secured the tree plugs to the differential.

After reconnecting the the battery and starting the Jeep, the Service 4WD light and no traction control light are no longer illuminated. I went for a short drive and the light did not come back on. I tested the traction by stomping on the gas on the wet roads and can confirm the rear axle is locking up again as it should.

I'll report back again if the lights come on again but I am hopeful that this has fixed the issue.

Thanks again to Robey5 for posting his fix.
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  #32  
Old 04-01-2017, 10:02 PM
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Re: "Service 4wd" light

Had same issues as most of you with serve 4wd and trac disabled. It started intermittently, then was consistent. With only 4 Allen bolts and 2 pigtails(electrical clips), I removed the rear Electronic Limited Slip Differential Motor. (ELSD) I found the rotor to be seized. Carefully twisting the rotor, it freed up. I spun it by hand several times until it spun with ease. Definitely a temporary fix, but very quick to remedy. Totally time was 30 min. Clips above t-case are the tightest spot but still fairly easy.

This is worth a shot if you would like to avoid several hundred in diagnostics.

2011 Grand Cherokee Overland 5.7 71k-Miles
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  #33  
Old 04-02-2017, 12:40 PM
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Re: "Service 4wd" light

Just adding an update.

It's been a little over 4 months and 7,000 miles since replacing the ELSD motor and the "Service 4WD" light has NOT returned. Since the replacement, the traction control and 4WD system has worked great with no issues.
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