The tow/haul button wire is probably broken. It is common for that to happen, especially if the wheel is tilted up and down alot. Check the orange wire to make sure it isn't broken, or at the connections.
2004 Chevy Silverado C2500HD CCSB LB7. (THE TANK) Pretty Much Stock, Fully Loaded, Fleet Emissions, Crappy EGR
1997 Chevy Suburban C1500 (The Bus)Stock, The 350 is still going strong at 170,000+
2002 GMC Sierra C1500 RCSB 4.3 V6 (The Green Machine)Misc. Headlight Mods, 6000K HID's, K&N filter, Airbox mod, Throttle Body mod, Resonatorless, Radar Detector, Garmin GPS and others. Sound System by Alpine, Pioneer, and MTX.