i have a 2004 duramax here at my shop, its a cab medium duty truck c4 i believe. it turns over fine but wont start, customer said he pulled out of his driveway down the road and it just shut off. had fuel in the oil, and three codes po621 generator l terminal circuit,po622 generator f terminal circuit, u1024, lost communication with trans control system. it doesnt even spit sputter or pop on silicone one bit. im at a loss with it any body else ever seen anything like this?