After four months of ownership my engine started knocking. I took it in, they said it was a balancer shaft assembly with timing chain and sprocket. The sound is still there but the dealership started the work is done and refuses to touch it. The noise is extremely annoying but does not affect running. I am of course worried the engine may die, but with the refusal to do anything I don't want to void the rest of the warranty.

- Albuquerque, NM, USA

On May 28, my husband and I noticed these fumes in the car, but we didn't know where they were coming from. When we opened the car trunk, we found that the tire sealant in the compressor kit was leaking on it's own. He brought the car to the dealership's auto shop and the compressor kit was replaced. On July 19, the check engine light came on. I brought the car to the dealership's repair shop, again. I was told that the computer module that controls the engine wasn't working right and it had to be reprogrammed by updating it. They were very vague in explaining the problem. My husband called the repair shop on July 28 and asked them to explain what was wrong with the car. They still didn't explain the problem very well and they said that they already told his wife. The statement that the the repair shop gave us says "customer states that check engine light is on, verified concern scan code P2096, as per tsb PI409 perform ECM re program clear codes / rechecked system all at specs." The mileage at that time was 2470.

- Staten Island, NY, USA

Driving down I-65 South in nashville tn middle lane with no compromising road conditions of any kind, I got a warning about the stabilitrac system and then within 25-30 seconds the engine shut down completely. I was nearly rearended by numerous vehicles as this is a very busy interstate. I was finally able to restart the car -it would not go over 25 mph and get to the shoulder. The check engine light remained illuminated.

- Murfreesboro, TN, USA

I have been having numerous problems with a pause in the engine when I'm speeding up onto a highway or to pass on the highway. It's most dangerous when I enter the highway. The car instead of just speeding up has been known to pause.. and then speed up. This is very dangerous because it's hard to determine when the car is going to "pause". I was almost in an accident because I had enough time to enter the highway and the car decided to "pause " and then go but that slight pause effects the timing of entering traffic. Also, I am near a highway with a lot of construction. The roads become uneven in parts without warning. I have to keep both my hands tightly secured to the wheel or the car tries pulling you. For instance : I was driving straight and there was a slight change in uneven pavement and my car seemed like it was trying to even out the weight of the car and it tried pulling me left and when I went to straighten out my car become uncontrollable and thank god there wasn't somebody in the right lane because it pulled me all over the highway and I couldn't control it. To be honest I have had about 6 cars and never have I felt so unsafe. Also my car is an eco car- it turns off at lights.. sometimes it shakes when it turns bck on and also it lags to move once it does come back on. My dealership said they found a defect in it and GM will "find a solution in 45 days".. I haven't seen any other reviews about this?

- Virginia Beach, VA, USA