| DTC inop/check engine light
Yet another CEL question.
MY CEL came on on the way to work, and yes I let my truck warm up. SO, I took to Checker and to Auto Zone and at both place they could not read the DTC with four different scanners. I stopped by the Chevy dealer and just wanted them to make sure the DTC system was working, that's all I told them they didn't even have to give me the codes. But since my 05 duramax just went 36K the answer was sure after a $70 charge.
I live in Utah and the weather been on the chilly side.
Any suggestions before fessing up $70.
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CrewDawg | 
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