My son enjoys being able to spread out when driving and also appreciates the convenience of hauling several of his buds around. He drives a 2001 Cadillac DHS. He has just moved to Massachusetts and registered the car there. It failed inspection with OBD codes P1860 and P0741. He has 60 days to resolve the problem. A little internet searching informs that these codes are related to the torque converter clutch circuit and the solenoid valve.
The codes may indicate anything from a bad electrical connection to a failed plastic solenoid (I hate plastic) to a worn TC clutch. Other than the not so likely electrical connection fix, labor is at least 12 hours, even for the solenoid. I don’t see this as an emissions or safety issue, but then I’m not the state of Massachusetts.