Hello my name is Justin and I just joined the forum! I have been watching for awhile and think the site is great and informative. I live in Texas. I have some moderate mechanical knowledge and like to work on things myself. My question is for a 2003 chevy silverado 2500 hd 4x4 with a 6.0. I was driving home and out of no where my truck began to shift wildly, my speedometer went out and my trcuk would hardly drive. My brake lights came on and my center read "check brake system" shortly after my truck began run and shift correctly again but the brake lights are still on and the speedometer doesnt work. I had the computer and codes checked and nothing came up. The brakes work fine and there are no leaks. I am lost??? Any help would be great. Thanks.