No recall & no manufacturing dates for failing OPDAs. All '05 & '06s use the same OPDA & they are known to have problems. Some have shaft binding which can cause excessive gear wear. Some don't have binding but still have excessive gear wear, others (some would say most) have no problems at all. No one knows what causes these differences although there are a number of theories.
I don't know what code you are getting but if it is cam position related that can mean that the gear has worn enough to retard the OPDA beyond tolerance & throwing the code. I would call that critical. If the gear fails you lose oil pressure & possible other engine damage. Read the first page here http://www.jeepforum.com/forum/f9/20...ilure-1144202/
I believe the code is P0016. It is putting you into limp mode but that won't really protect you if the gear fails.
To read your own codes turn the key (without starting) on-off-on-off-on & read the code in the odometer display. Clear them (it) disconnect the battery for a couple minutes. I would pull your OPDA or have it done. The link I gave will direct you on how do it yourself if you choose.