Good idea to have the codes searched. However, my car never showed any codes. During all the problems i had there was only one clue. I have two identical cars, one is a 2008 model and the other is a 2009 model, and the problem car seemed to crank over just a little slower than the other car. That is why i replaced the starter. I still don't know if the starter was the problem. If i would of had only one car i probably could not of detected the slower cranking speed since the difference in cranking speeds was so minor.