One problem related to engine and engine cooling has been reported for the 2001 GMC Sierra. The most recently reported issues are listed below.
My 2001 GMC Sierra has a tendency to use oil. It happens after about 3000 kms after an oil change. I brought it up to the service department at the dealership and they told me to try a different brand of oil. I also complained about my truck rolls ahead when I start it in cold weather. They said that this is normal. That is their answer for everything!!! as far as I am concerned, when a vehicle is in park it should not move when you start it!!!!.