3 things can cause this:if code is present but no drivability issues then its a trip to the dealer to get an update for your fdcm module.
if code is present and you have drivability issues ex:feel clunks in front when you turn or you feel the truck is stuck in 4x4 and wont let you turn you have to fight the steering wheel then its either the front diff locking solenoid with the little wiring harness thats inside the diff or the fdcm module.
front diff solenoid is the cheapest one with the harness sold separetly but the job itself is longer and messier search my threads and you will find part numbers you need and also theres a lot of tutorials and videos on here and the net
as for the module its pricier and you have to have the exact one or else it wont work and its a 15 min job to replace and very easy to access:lift the rear driver side seat as you would to let access for the third row seats theres a piece of carpet in the plastic molding lift and remove and you will see 2 modules its the second one the one towards the middle of the truck.you need to write down the number on it ex: 56044199AK
with that you should be able to find the right parts
good thing to do is to inspect wiring harness connectors at both module and solenoid for corrosion.
and in my opinion if you have drivability issues its most likely the module.its not sealed and over time moisture gets in or it doesnt take much a soft drink spilled snowy boots going to the third row ect..
2006 commander limited 5.7 hemi silver loaded and now with hid's hi low and fogs,now with viper 5901 alarm starter combo and idatalink ads al ca ch5,yokohama geolandar I/T GO72
Last edited by H311B0Y; 12-29-2012 at 12:02 PM.