it about the 4 wheel drive system on 2005 GMC Sierra 1500

i have a GMC sierra 1500 I've change the switch twice an change the actuator three time an am still getting the service 4wd message i check online to find the answer an it's the the same thing change the actuator

by in Bruceton Mills, WV on January 05, 2014
1 answer
ANSWER by , January 05, 2014
It really needs to scanned to read the transfer case module to find the real problem, could be just a software update.