Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, reading engine codes in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I changed out my spark plugs due to misfiring, job wasn't to bad after some people here gave me some ...
I changed out my spark plugs due to misfiring, job wasn't to bad after some people here gave me some help. But I still have misfires, the check engine light is now on too, I tried reading the codes with my own reader and another newer one from a friend. Niether will read the codes. I believe I have a coil pack or two giving me trouble but since the engine has 200K on it and the tranny is acting up so I only want to invest what is needed. Does anyone know which code readers work or if there is another way of testing coil packs.
Aw, I don't believe either we tried where CAN BUS enabled. At least the documents with them don't say it.
I will price the right one and decide whether to let the local guys give me the code reading or purchase another reader. Being only partil employed means which ever way costs less.