With some digging I discovered this is a common problem and it is caused by a cheap ass component used in the Anti Lock Brake system. This is called the EBCM (electronic brake control module). So the problem is that this little module is shorting out and sending random signals to your dash. What you need to is to remove it, repair it, and reinstall it. Here is a link to a Chevy forum that really goes into detail on how to remove your EBCM and the overall procedure so I'll just give the highlights of my experience.
http://chevyavalanchefanclub.com/cafcna/index.php?topic=121523.0
It's located underneath your driver's seat under the carriage of the vehicle (not like under your seat inside your truck, actually under the vehicle). It's fairly easy to remove, but you have to get a really short handled screwdriver or one that bends to the side like a ratchet. There are four screws and like three electrical connections. Once you have it removed, wrap the place where it was with duct tape as well as each of the electrical connectors to keep dirt and moisture out if you are going to drive the vehicle with the EBCM being installed. If you can leave the vehicle in your garage for a few days, don't worry about it.
You can repair it yourself if your good with circuit boards and what not, but I elected to just send it off and have it repaired for about 100 bucks. There are tons of sites that do stuff like this. I think I sent mine to Module Masters, but I also saw one called ABS Fixer. They repaired and sent it back within days.
I reinstalled the module on my truck and fired it up. It did NOT initially fix my problem and I was livid thinking I just wasted a hundred bucks and a lot of time. I read somewhere that you may need to drive upwards of 20 MPH to make the module go through all of it's program routines or whatever. Once I took it down the street, the light went off and hasn't been back on since. BOOM!
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