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Same thing just happened to me. I bought my Tahoe 10 days ago. I replaced my backup lights with new Phillips LEDs and I started to see the same issue. Did you ever got your problem resolved?I replaced my reverse lights with new LEDs and started to see the issue. Just got suburban 10 days ago.
I figured it was an alert due to the lower voltage the LEDs are drawing now but maybe not. Thanks for the heads up