Have an appointment with a GM dealer. Called GM tech line again to ask for a answer on the extra shift detent, no answer yet. Also asked for warranty as I have just 600 miles on it but just over the 2 years. It is always tough building a vehicle under 2 years as you generally buy your drivetrain to fit first and then build the rest. My buddies that bought the same engine and trans packages about the same time I did do not have their projects completed yet. But they both have the extra shifter position that I have.
Last edited by vet57air; 05-18-2022 at 12:45 PM.
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Had my appointment with a Pacific GM dealer today. They treated me very well. Spent a couple hours testing to checkout the P18C2 code which is "internal mode switch". Next step is taking the pan off so we have ordered a mode switch in case that ends up being the problem. Still have not heard back from GM on warranty or extra shift detent.
I finally got a email from GM telling me there are 5 detents used and 6th is not. Not really any help as I and 2 others I know of have 6 detents. When shifted from M to the 6th detent I get "error" displayed.
Any improvements in drivability with the things you tried?
Is the extra detent the only issue you still have?
Jeff-
Don't know if the extra detent is an issue or not. The issue I do have is no manual operation but hopefully get that fixed tomorrow with "internal mode switch". Other than that transmission is fine.
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Took to the GM dealer and they changed the internal mode switch. During final testing the same code came back. It appears that when we plug the Dakota Digital BIM module into the OBD2 port it causes the code. Dakota's engineers on it now and I have no doubt they will come up with a fix. The high tech modern age we live in. Another thing to complicate things is the code P18C2 is now a "permanent" code. Yes its a thing. Google it.
Last edited by vet57air; 06-08-2022 at 11:49 AM.
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I have had similar issues related to the BIM. You can go into the BIM settings and change the bus address of the BIM. I’ve solved a couple of strange issues changing the address. There is four address options if I remember right.
Having the BIM and a scanner connected at the same time can also cause some strange things to happen depending on the style of Y connector you use on the port.
Don
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