I recently had a lot of work done to my 2003 Cadillac DeVille and under the hood is almost like new. The last work I had done was a head gasket job. Afterwards, I couldn’t get my computer codes erased and my retired mechanic neighbor, who did the work, couldn’t and/or didn’t have the equipment. The “ABS-Brakes-Traction Control” lights are on as well as the “Check Engine Soon” light underneath those. Also, on my information screen I have such messages as “check gas cap,” “check brake fluid,” “check coolant level.”
My car has the PCM (powertrain control module) located under the air filter. I’ve tried a few things to remove the codes that I’ve read online, but nothing has worked. I haven’t messed with the PCM yet.
Anyone have any suggestions as to how I might be able to clear out the computer on my Cadillac?