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In the commercial world the 05 acert engines had a catalyst in the muffler it made them real expensive but were also prone to plugging up especially if not driven at highway speeds to warm up egt's. I have also seen around here standard mufflers coke up with a tar looking substance again from...

I should also add the tcm and ecm talk to each other and the transmission could be throwing the code.

the c-7 is an electronic engine you will need a scan tool to pull codes the cat dealer will use cat e-t prolink makes a scan tool that will access the engine if yours is an acert engine. now days I just use the laptop with e-t once you get the codes than we can go from there doing diagnostics...