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2021 Ram 1500 code U0402-00

Gwinfrey83

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So every once in a while, at a cold start the truck will have a very large up and idle where the whole truck looks like it’s got a bigger cam put in it, then will idle good after about a minute
Took it to autozone and scanned it with code above, bad signal or even the transmission?
2021 with 67K, would this be covered under the power train warranty?
 

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