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6l80 won't shift

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6l80 won't shift

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Old

Jul 18, 2023 | 11:36 AM

#1

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From: Louisiana

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6l80 won't shift

So I've got a buddy who has a 2014 silverado with a 6l80 transmission, completely stock truck. The truck will not shift on its own. He can manually shift the truck all day and it works perfectly fine, no slippage or anything. What could be the cause of this automatic transmission not automatically shifting

Old

Jul 20, 2023 | 09:35 AM

#2

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From: Louisiana

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Nobody?

Old

Jul 20, 2023 | 10:12 AM

#3

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From: Poplarville, MS

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Any codes set? Speedometer work? More info would help.

Last edited by bbond105; Jul 20, 2023 at 04:28 PM.

Old

Jul 20, 2023 | 12:19 PM

#4

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Probably a hydraulic leak somewhere on the valve body and/or valves.

Old

Jul 24, 2023 | 07:25 AM

#5

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From: Louisiana

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I'll ask him what's the codes, and the speedometer works just fine. He just has to manually shift

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