I used this site ealier for some DTC's I had stored (P0128 & P0300). http://service.gm.com/gmspo/mode6/index.html
P0128 (Coolant Temperature Below Stat Regulating Temperature), this would be my 180* T-Stat & P0300 (Engine Misfire Detected), rinsed off engine one day, and it sputtered for a few minutes, then it was OK. I found this site very helpful for the CC as well as other GM vehicles.
then it was OK. I found this site very helpful for the CC as well as other GM vehicles. 
