Put in an aftermarket head unit (OGM1) and back up camera in a 2012 Sierra around 2013/14, and the back up system has worked fine since then. A couple months ago, the monitor started showing interm...
I would check all the connections first. Invest in a can of electronic contact cleaner (from your local hobby or electronic store). Take all connections apart and spray the cleaner on them and then put back together. There might be some dirt, moisture or oxidation on one of the contacts. Heat , humidity may make the problem intermittent. If that doesn’t help, then look at the camera. Ken
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