My PEM just failed, I'm upgrading it because Tesla at Fremont said its a lot less likely to fail. It's going to cost just under $1600.
You might be confusing the PEM with the PEM fan. The original 2.x fan failed more than once a year on my car. The new one is much more reliable and if you move to a snowy climate, they will replace it free.
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While talking with the Tesla service rep there was a large bang in front of the service center. ...