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I had the same problem with my '20 RS, bought used this spring. Dealer said it was a module which I understood is in a rear wheelwell. Not in stock, obviously, and took a month to get. Dealer had the car for three days to install the new module. first, the software was incompatible, took another day to install the new software, then another day to troubleshoot with GM IT. We'll see how well it works now. BTW, the camera only blacked out once in the 2+ months since the initial diagnosis. I'm wondering if it was just a loose connection or water-related,
 
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