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I bought this 2020 new and today I had it in for a check engine light P04FB. Two things; the dealer says the error is because of moisture but there is no fix for it, and it is labor intensive. So, when I'm out of warranty I will have to pay for the labor when they get a fix. 2nd thing. There is something plugged into my data port, not the OBD 2, and no one can tell what is it, except that is is not a chevy device. The dealer i bought it from said maybe after market steps. I bought this new with 256 miles on it. Can anyone tell me what might ben there?

 

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I had time to crawl in there and take a look. It is not a device. It is just an extender or adapter to the ODBD 2 connector. Not sure what the mechanic was thinking, without looking a little closer at the cable. It is unbolted from the bracket, but they may have done that when I had it for a tailgate sensor issue.

 

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Where does that extender/adapter go to? Splitters and multiple obdii devices attached to the port can cause problems. I would remove it unless you need it connected for some reason, and disconnect it when diagnosing the truck.

Yeah, that is what chevy is saying, that it it could be throwing false codes.

 

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Pulled thuis out today. I'll look these up later.