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Old 07-09-2009, 02:36 AM   #1
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Duramax/Allison stuck in gear!

Truck: 01 2500

The truck will not come out of 4th gear, anyhelp guys?

Not mine, my cousins, making the post for him.
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Old 07-12-2009, 05:49 PM   #2
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its stuck in whats called limp mode. if you shut the truck off and wait a couple mins it should be ok again, you can get the tranny reset

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Old 07-13-2009, 07:20 PM   #3
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Maybe it needs a new NSBU switch? This solved the problem on my buddies truck last summer.
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Old 02-16-2010, 07:12 AM   #4
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Limped it, ive done it serveral times. sucks but you gotta pay to play
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Old 03-25-2010, 12:18 PM   #5
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My 02 did that last month. Lost gear selected indication and it limped 50 miles home. Replaced the nsbu and had the dealer clear the SES message and all was fine until it's current problem.
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Old 03-26-2010, 01:13 PM   #6
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Limped it!
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