My 2013 Tahoe has a vibration that can be felt at idle in park and drive. I bought the truck with 1200 miles on it and it now has 33k miles. The vibration has occurred since the first week of ownership. In drive, it idles at 500 RPM but often drops down to 400-450 RPM without any type of electrical load being added. The vibration feels a lot like the engine is simply idling too low. If I put my foot on the brake and bump up the idle manually the vibration goes away.

I've had it in to 3 different dealerships almost a dozen times in the last 3 years but no one can give me an answer. No codes, not the mounts. I'm always told its normal. It drives me crazy to the point of just wanting to sell it and move on.

Anyone else have this issue?

 

My '13 Tahoe has somewhat of a lumpy variable idle (500-600rpm) while in park, but not while in drive. I also owned an '07 Tahoe that had the same lumpy idle as well. My best friend has an '11 Burb which also exhibits the same lumpy idle while in park. All 3 of these vehicles has the 5.3L motor. If this "vibration" you are experiencing is the lumpy idle that I'm describing, then I would say your "vibration" is normal.

 

my suburban with the 5.3 does this but not while in park, while in drive but at a stop.