Yesterday my converter stopped locking up. Took it to a trusted trans shop and hooked up a SnapOn Scanner. The truck is throwing no codes, but in real lime logging, the ecm is commanding the converter to lock. Since the ecm is commanding it, and there is no codes being set, does that mean the converter is getting the message and locks but it’s just slipping and therefore the ecm can’t detect the mechanical failure? I have been getting the code for converter lockup failure off and on for the past year. It would set the code but it still locked up fine.