Hummer Forums - Enthusiast Forum for Hummer Owners

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Hummer Forums - Enthusiast Forum for Hummer Owners (https://www.hummerforums.com/forum/)

- PRIVATE For Sale / Trade Classifieds (https://www.hummerforums.com/forum/private-sale-trade-classifieds-10/)

- - Serious Problem... NEED HELP (https://www.hummerforums.com/forum/private-sale-trade-classifieds-10/serious-problem-need-help-19528/)

BummerHummer

06-01-2010 09:16 PM

I am a G.M. tech, if you can get me the codes I can give some help right from the OEM website. The high shift point, and the speedo malfunction sounds like a bad comm. between the speed sensor and ECM/PCM. The place to start is with the codes.

Jim

2wheelmonster

06-01-2010 09:45 PM

I would be shocked if the O2 sensor problem threw the whole engine off like that, but then again technology is great.... only when it works properly

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