Hey how are you
The most common issue will be the 4wd transfer case module ,passenger side under glove box , around $400 new
in some cases the 4wd motor and 4wd switch could be causing it , these will be $200 on switch on $ 250 on motor if bad
NOW TO BE ACCURATE ,HAVE IT SCANNED WITH GM TECH II SCANNER OR Equivalent AND READ 4WD MODULE FAULT CODES AND BASED ON THAT WE CAN PULL UP TROUBLESHOOT STEPS AND BE ACCURATE ON IT ,IF YOU DO JUST POST THEM BACK HERE FOR ME AND I CAN HELP YOU FURTHER ON IT
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