I worked for years on truck electronics. This is typical of techs who are out of their depth and honestly terrified of anything you can't see. The can modules are by nature stupid. If they say they can't do something that is a fact. What the techs do is then jump to the conclusion that the bit that won't talk is dead. It's like phoning your house, no one answering, guessing it burnt down and buying a new one. The electronics are in fact very reliable and when training techs I would always make them unplug everything and buzz out the loom.
We are still getting through a generation of mechanics who are now retraining as electronic techs. German companies like the one I worked for forgot this 'soft' element. Too many engineers at management level making assumptions.
With an obd2 reader, diagram, meter, patience and a logical approach you should be fine.
I have some sympathy as this BMW dealer was out of his depth, but when you start rushing to your own solutions you have to take some responsibility yourself. I once billed a bus company £700 to change a fuse. He claimed the abs ECU failed and his mechanics had already checked the fuse. I drove 200 miles and proved him wrong.
Andy
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