I have a 2004 chevy 2500hd 6.0 with a 4l80. Just rebuilt the transmission. New tcc solenoid and torque converter. The truck runs ok till it warms. Then when you get to 50 it will lockup 3 or 4 seconds later it will come unlocked. Sometimes it will lock again for a few seconds but most times it won't at all. When on the interstate it gets to almost 200 degrees and gets worse. Usually it runs like 140 degrees. On the last 3 hr drive the truck tripped the check engine light ode p0894. I don't know what to do I've replaced everything except the pcm. Someone must have had the same issue and figured it out. Please help i don't know what else to do.