I'm just want to let people be aware that in 2015 GM issued 2 letters (NOT A RECALL) on the 2011 Chevy Impala in regards to Service Stabilitrak , Service Traction Control, Engine Power Reduced. The letter contained you're vin# of your vehicle. The letter stated that you do not need to bring your vehicle in for service unless you have this issue with your car. They said that they extended the coverage to 120,000 miles and or 10 yrs whichever came first. The letter also had an attachment for a refund if you had this service done but of course it would have been needed to be done at a GM Service Center. So far I had this issue twice with my car. Once in 2013 which it was covered under the warranty and most recently last week. I knew I had the letters somewhere and dug them out. Then I went to car part place and had the codes read. The 2 codes that came up matched the 2 letters that I had from GM. I then watched a u-tube video to see how long the repair would take. (An hour or less so I see) So, I made an appointment with the service dept. and never mentioned the letters. When they called to tell me it was the accelerator pedal & sensor and it was going to cost $455.00 to repair and then I mentioned the letter. He pulled up the VIN number and sure enough it was covered at no cost. He seemed surprised and said he had no clue about the letters for this issue. I wonder how many people they ripped off. Needless to say when I picked up the car they only charged back GM $110.00 for part and 63.50 for labor....they were truly going to rip me off. Even if you have a 2010, 2012 or 2013 have them check the vin# to see if this is covered. If you already paid for the service at a GM dealer go and get your $$ back. I hope this helps someone.