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I have a 2008 GMC Sierra and I just happened to have the same problem and it just started 2 weeks ago now I changed up my license plate harness because that wasn't working and I changed out the circuit board at the back of the truck it's still a problem and I'll change the Lights still a problem just the running light only front to back What's going on. I have new harness coming today for left and right back taillights harnesses change them out and see if that works if not it's somewhere in the middle one wire for the taillights