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My wife's Yukon has started vibrating while maintaining speed around 55 mph. If you accelerate it goes away, and if you let off the accelerator it goes away. I thought it might be an overdrive transmission problem, however I noticed it doing it some while in tow-haul mode also (both while...

The vehicle is a 2005 Yukon with the 5.3. My wife told me it came on today. I took it to be read and they said the gas cap was not on tight. We checked the cap but it was on tight so I bought a new one. Now I need to know how to reset the light to see if that solves my problem. Thanks, FMC