Did this ever get resolved?
I have a 2011 Yukon xl 2500 doing the same thing. High Mount works, left and right stop lights don't (I suspect they didn't work when I purchased).
I even tried to see if it had a surveillance mode, tried putting the parking brake on and if when starting, didn't...
Any fix for this? Same issue 2011 Yukon xl 2500, former fire dept vehicle, everything works but left and right brake lights. Traced all wires to the main fuse panel, chmsl (center high Mount stop light) works, no blown fuses, but fuse diagram also doesn't seem to correlate to half the...
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