Truck came in the shop today. the customer pulled the ecm. Ecm is 1616825. code on ecm bbnt. chip is bumz. I don't have a bumz file. I use the bbnt. check engine light is on. codes 37, 38, 43, 51, 52, 53. I put the stock chip in. same thing. lesson learned. I should of drove the trick before he pulled the ecm. now. I'm pulling my hair out.
