05' 4.7l 'service 4WD system resolution
I have a bit of information to share that may help a few folks.
I had the N23 recall done mid January of this year (flash Trans case for the neutral issue).
Last weekend I started seeing the 'Service 4WD System' flash when I started the Jeep. Ran fine. No worries.
Then I got the CIL light and I tried to switch to 4WD low and then the 'Service 4WD system' was steady on for a few minutes and would go off.
The solenoid did not fire that I could hear.
After a couple starts everything would clear but the then the message would flash when I started.
I did a little googling and other research and found the TSB from Jeep number 21-022-14 Rev A dated July 29, 2014.
This TSB describes the problem exactly as I was having and the solution routine for the reflash.
I set up an appointment with Park Jeep here in the Twin Cities and gave them the TSB and in less than an hour they performed the reflash and all is well. No charge.
I tried the 4 Low while I was still there and the solenoid ran and no messages and went back out again and no issues.
There are no mechanical maladies and the Jeep runs fine.
Cheers - john