I always drive in Tow/Haul mode. Yesterday on the way home from work, I noticed the torque converter was not locking up. I tried several speeds, turning T/H off and on, nothing worked. T/H light on dash was lit when activated. Any suggestions? This is on a 2005 2500.

 

TC was bad, but trans was still good. I had the TC replaced and the truck is back on the road. Thanks for all the help...