My wife's 2007 yukon xl had a message that stated that the traction control was off and a reduction in power message while traveling on the interstate highway going 65 miles an hour during rush hour. when this message came on the yukon came to a very dangerous reduction in speed and was very close to getting rearended by the vehicles behind her. she was able to pull over to the shoulder and was able to restart the engine and the message reset but came back on soon after she got back up to speed and the truck shut down again. i have since replaced the throttle body assembly and checked all ground straps replaced the battery and have checked the harness. the issue has continued and since my vehicle is out of warranty it is getting very expensive to start replacing parts on the vehicle just to have it do the same thing. according to the dealership there are no recalls but there are several forums on line with people all over the united states that have the same problem with there gm products. this is a very serious safety issue that needs to be looked into, before somebody gets hurt or killed. gm needs to recall their products that are involved and repair them.- *tr