I am looking thru the 07 service manual and can't find the codes you listed. The codes that are listed are, B1613, B1615, B210F, B2213, P0930, P0931, U0019, P0707, P0708, U0141, U0151, U0154, U0164, U0168, U0169, U0184, U0186, U0195, U0197.

 

Thanks for checking on that 07 ThundRoad. Perhaps they are codes unique to the 2006 model year. I found a couple of posts on here referencing C codes with a link to a list of them, but when I click on the link I get some type of error message and the page will not display. The truck's CEL is not lit and I have no codes when I do the ignition switch on/off three consecutive times. Whatever the codes represent, it must not be anything too important or I would be getting a DTC code (I think).