Hello! Well I've been having issues with my tow/haul where the light will come on and then engage the transmission to go lower. At times the light would come on after turning the car on or even while I'm driving. Just last week my transmission went out so we had to rebuild it and just yesterday I got the truck back. This morning the light came on by it's self and engaged the transmission again. So I was wondering if anyone knew any possible reasons for why it would be doing this. My dad thinks there may be a broken wire or that there's a problem with the shifting handle. Just to let you guys know I have a 2001 Chevy Silverado 1500 Ls 4x4 with automatic transmission.