2011 Chevrolet Avalanche Engine Problems

“I have began to notice when slowing down (foot off the gas and coasting with foot on brake, or brake applied) at any area where my speed decreases to less than 15 MPH that my Avalanche will seem to sort of lunge forward. The first time I experienced this I believed it was related to me and ignored it. The next couple of times I experienced this I thought there may be something wrong with the gas or engine. …”

“Traveling at 65mph in -25 degrees f, our check engine light and stabilink traction control lights came on. Dash display said vehicle would lose power and our engine shut-down. We pulled over on a snowy highway and read blogs and found our throttle body sensor would crack and fail at extreme cold temp. We started vehicle and it reset, but same problem happened within 5 miles. I found a auto-zone in princeton, minnesota and bought part and replaced myself. As it was new years eve no GM assistance was available. Gm tells us there was a service bulletin but they failed to notify us. …”

“At times when the vehicle is slowing down/down shifting (more common when going up a grade) it will suddenly lunge forward (before coming to a stop) even with your foot on the brake. It seems to happen when downshifting from 2nd to 1st gear and sometimes it catches me off guard. This is a very dangerous situation especially when slowing down near people. I am always concerned that the vehicle is going to lunge forward and hit something or even worse someone. I hope NHTSA investigates this situation as other people have reported the same problem.”

“I own a 2011 Chevrolet Avalanche ltz and at times when the truck down shifts it will lunge forward. I really need to have my foot firmly pressed on the brake to keep the truck from possibly hitting something or someone in front of me. It does not do it all the time and it's rather random. I feel that is worse then it happening all the time because I don't know when to expect it. I have not received any notification of a recall, but I feel a fix is definitely in order. Something is not right and it could result in a crash.”

“At 40000 we noticed we were having issues with my Avalanche burning oil, when we asked the tech at chevy he told me that was normal for the newer engines to burn oil, at 130,000 mile we started having problem with a spark plug fouling out, I read that this was directly related to the oil consumption problem. At 181,000 mile and only four years old we had to replace the engine after replacing the spark plug and wire 3 times this cost us $6847. I have read this is a constant problem with the 5.3 engines and could cause4 major accidents if the end up on a highway when they finally go out”