2010 Sierra. No 4x4 j no Iights on knob

[JacobNya]

Hi guys & women,

iv got that 2010 GMC Sierra 5.3 still and got a new problem with the 4x4.   My 4x4HI  got stuck on recently and so I read up about cleaning the ground cables I replaced the actuator I replaced the dash knob and the yesterday I replaced the transfer car control module and that instantly put my truck back in 2 wheel drive.  BUT the lights on the knob are still only coming on for 2 seconds then it goes out and I still have “service 4x4” message on dash    I took to the dealer yesterday and had them reprogram the new module but it didn’t make any difference and I told the service guy about the lights on the knob going out and he just said it cost $145 to diagnose the problem. So before I have to do that I’m hoping someone on here can help me, thanks