I myself had problems with my 4lo after having the n23 recall performed on my 2008 Jeep Grand Cherokee. Approximately one month after the recall was performed, I returned to the dealership, with an appointment, and had them take a look at my Jeep. They diagnosed it as a bad transfer case actuator and charged me a diagnostic fee of $126.01. I bickered back and forth with the service adviser about the problem I was experiencing, which only occurred after the recall was performed. I also showed him the many pages on JeepForum about people experiencing similar issues after the n23 recall was performed and the recall service instructions that instructed the service tech to clear the codes multiple times. Of course the service tech stood by his guys and said the recall was performed as per the recall instructions.
As soon as I got home that day, I opened a case with Jeep Corporate and was assigned a case number (I can provide the case number on demand if you seek it). The following business day, I was contacted by a sweet lady by the name of Peggy who went over my concerns with me. She in turn contacted the dealership and agreed to compromise; Corporate would help with paying the cost of parts and labor of a new actuator, and I would have to only pay $100 out of pocket.
But I was not satisfied with the that I chose to seek other options. After numerous hours of research on JeepForums, one of the most prominent fixes was simple as reading the recall instructions; "if code XXXX appears, clear the codes three times." At this time, I was already thinking to myself, "I paid $126.01 for a diagnostic fee, and then I will be paying $100 for a new actuator that might not even fix the problem." Later on when I had enough money, I purchased a Superchips Flashpaq 3870 with the mindset of, what else do I go to lose. Let me tell you; within 10min of that brown box arriving on my doorstep after UPS dropped it off, I was once again able to actuate my transfer case to go into 4lo. After two months of being on the phone with the dealership and Jeep Corporate, going back and forth arguing and pleading my case, I fixed the problem by plugging in a cable and pressing a few buttons; it was so simple a child could of done it.
In the end, I ended up contacting my case manager at Jeep and let them know I fixed the situation myself and with what tools. I requested a refund in the amount of $126.01 from the diagnostic fee I was charged by my dealership, which I received in short fashion. It has been 3 months since I was able to fix the problem myself and I have not had one hiccup since then. However, I hate everyday that I come onto this board and I see hundreds of other people suffering from the same crap I went through for months. I have owned Jeep's since I was old enough to have my license and would want to keep it that way. But with the headache I had to go through is unacceptable in my book and makes me think twice about getting a new Jeep, or a used one that is still under warranty.
2008 Grand Cherokee (WK)- 5.7l HEMI. OME HD Lift, Superchips Tune w/ ATT, aFe Intake, Flowmaster 44