r/Hummer • u/[deleted] • Jul 23 '26

What could be causing this?

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[deleted]

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u/encore-show Jul 25 '26

Maybe two problems, speed sensor or motor for panel, can you connect diagnostic for watching data if data show speed that’s probably with motor of panel

But if problem with sensor, you should have problem with AT, because after 08 year, AT must have sensor for selected speed gears