My father-in-laws truck (05 3500) won't start. It old him to check for codes.

"On the c codes I get A4 40, 42 ,56,58. The number changes every time I do it. "

I know its around here somewhere, but I can't find the link to reading codes. Any help guys. thanks

 

Here is the link to the codes. You can find the codes via the tab at the top of the screen noted as DTR WIKI.


http://wiki.dieseltruckresource.com/..._codes_C_Codes