"SERVICE 4WD SYSTEM"

Asked by GuruTJZX Apr 04, 2017 at 11:50 AM about the 2008 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

Hey Guys, would anyone know how to fix "Service 4WD system" the sign
constantly coming up and 4WD is not shifting.

6 Answers

2,050

Yes. You need to take it to a Dodge dealership. They will reprogram the TCU with a software update. It only takes a few minutes. Check first though. There was a recall for this problem and you might get them to perform this service free. It's a proprietary software and not available to the general public or a garage.

3 people found this helpful.
100

N23 and P73 recall FDCM reprogramming. A few cars put themselves in neutral when started with remote start and a recall was issued. N23 reprogrammed the system of the FDCM. P73 checked the reprogramming because after N23 many were showing Service 4wd System and not shifting into 4lo. My 2008 jeep gc overland 5.7 hemi is now doing it and when I called Chrysler Jeep they informed me that since my vehicle has been serviced for both N23 and P73 it's a crap shoot as to if it will be covered at a dealership for a fix and may be on my dime. Hence... a few people didn't place their parking brake on and remote started their vehicle. Something failed on their vehicles and now we are all suffering from the reflash "fix". Hoping to front the diagnostic cost soon at the stealership.... uugh!

3 people found this helpful.
30

Got same problem on my 2005 Grand Cherokee Hemi. After went to a dealar had oil change. The next day the SVC 4WD light on and the dealar tell me that I need transfer case replace. I have rarelly use 4WD and never had this problem. Anyone have ideas?

2 people found this helpful.
100

Sooooo.... had "service 4wd system" alert and then one day my 2008 jeep gc 5.7 hemi wouldn't start. Took it in and it was a fuse that controls both. NOTE: FUSE WAS NOT FRIED! It just tested as having bad resistance. They replaced the fuse and the error for "service 4wd system" has been gone since and she starts everytime! CHECK RESISTANCE ON THE FUSE!!!!

5 people found this helpful.

Which fuse, what should the resistance be. Haynes manual tells me nothing

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