Friend has a 2005 that for past year has had electrical problems. It has been in and out of dealer with many thousands $s spent trying to rectify. Car would have intermittent complete electric failure without warning. Dealer redid grounds, replaced, battery, alternator, several ECMs without success. They have just replaced the Onstar system claiming this is the cause as it effects all electric circuits. Is this a problem for 2005s? Doess this sound reasonable? Wlecome any and all thoughts/opinions.

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