I have a problem with my '03 GMC 2500HD. Occasionally when I hit my left
or right turn signal, both signals come on.

I'm sure it won't happen if I take it in for warranty repair. I've seen it happen
about a dozen times in the last 5000 miles or so.

Has anyone else had this issue?

Thanks,
Lorne

Even though the condition may not occur at the dealers, ask them about it, they may have fixed other customers cars.

Good Point.

Thanks!

mine did that same thing every now and again for a thousand miles or so, now it does it EVERY time i put on my right hand turn signal. Told the dealer, and it wasnt happening when i tried to show em. That was today, theyre fixing the problem for free Wed morning. Its your indicator switch, you need a new one.

My 05 started doing it occasionally too. A quick flick of the 4 way switch seems to cure it temporarily, but apparently it's a fairly common problem. I saw another thread on the problem recently.