My 2007 Chevy Tahoe has service 4 wheel drive on dash and a check engin light is on and remote start will not work. Had the check engin light checked and it said transfer case control module has lost communication.

SOURCE: Blazer stuck in 4 wheel high

I had the same solution with 2005 blazer......dont know how but this worked...........removed the courtesy lifgt fuse for approx. 10 minutes....put fuse back in and voila..able to shift out of 4 wheel drive

SOURCE: 2007 Chevy Silverado when my check engine light

It's a safety feature. For example, if there is no oil pressure when you start the engine, you could not see that unless you were in the car and could spin a bearing or seize the engine by starting it remotely and letting it run unattended. So when the check engine light is on, there is something not working properly with the engine/engine management system and it wants you in the car where you can see the guages and turn the engine off immediately if there's a serious problem.

SOURCE: 1999 chevy silverado service 4 wheel drive light

I had a similar problem with the Service 4 Wheel Drive light which came on intermittently then became more consistent in the message center display. It would go into 4 wheel drive if the message center did not display the Service 4 Wheel Drive message in the message center, but not when the message was displayed. I found the transfer case switch module in the dash was defective, and it has been working with no other problems for three years.

SOURCE: stuck in 4 wheel drive and wont come out.

hey there i cant tell you what you are missing but i can tell you how to disengage the front wheels . ok you have a vacum line that runs right under the battery and a line that comes up from the front diff. to the same place ( you may have to remove batt and batt tray to get full access to this) un bolt it and temporaly put batt and batt tray back in start it up and decompress this and see if it comes out .... you should here clunking noise if it goes back in ... if thats the case just pull that big vaccum line off .... to test get all four tires off the ground and have some one put it in drive but dont hit the gas it should turn on its own ...if that dont work check the cable that runs down to the differental

SOURCE: 2002 trail blazer 4wheel drive service light on

I would first give a visual test on the wires to see if there is a short anywhere, can you run a test meter on the control module to see if there is ohms resistance or shorting out!

Hope this helps.

contact again if you cannot sort this out!