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I don't think the transmission needs to be replaced, and I don't think the dealer performed any real diagnostics. I also think it's an electrical issue. I picked the truck up from the dealer and took it to transmission expert. He pulled all of the codes (see attached). He says he doesn't do electrical, so he dropped it off at someone who does. Pat Precision Codes Colorado.pdf -
Those are famous for a water leak right into the right side fuse block and will cause everything you are complaining about. The fuse block is under the right side of the dash and the connectors will be corroded and green if its a water leak. -
By silveradosid · Posted
i would be checking the driver door harness -
I agree about the 40-20-40 seat. It's one of the most practical features on these trucks. As for the V8 options, I think we'll have to wait for the official ordering information before we know what's actually available.
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It's too early to say. The 2027 3.0L Duramax is based on the LZ0 engine with ongoing improvements, but there's no evidence yet that it has completely resolved all the issues seen in the 2019–2026 models.
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