I know this is an old thread but I need HELP! I've got the same issue. I got my original TCM back from HP Tuners unlocking service and it won't read...
New to the whole tuning thing especially with the hptuner, installed a new rebuilt transmission from a company called "Whatever It Takes" and bought...
If you're hearing audible knock under light load I would start by doing an induction service on the vehicle to get it de-carboned. Might want to try...