I have had problems with this truck on the first week I bought it. not only the engine light came on, the stabilitrak light has come on as well. I am very disappointed in Cadillac quality. I had went on the Cadillac forum and seen all of the problems this specific model has when these two combined lights come on and it is nothing close to minor. I am looking at possibly having to buy another engine. I am pissed! this is what my personal mechanic had told me. He had chose not to even get into fixing it because the problems with these vehicles can be so extensive. I am now waiting from a response from the dealership about what is the damage.