4wheel low but no high or 2wd

Asked by GMman4life Feb 05, 2019 at 10:13 PM about the 2004 GMC Sierra 2500HD 4 Dr SLE 4WD Extended Cab SB HD

Question type: Maintenance & Repair

I have a 2004 GMC 2500HD with the Duramax and Allison Trans.. My truck was doing great in 2wd then all of a sudden it kicked out of gear, now the only gear i can get is 4 wheel low. try to select 2wd or 4hi and display screen says gear select prohibited...Replaced encoder and switch and TCCM and no luck....i have no where to go next. hopefully someone else has experienced this also.

1 Answer

MiTrucks answered 5 years ago

Had same issue in identical truck. It was the transfer case pump. Get the HD replacement with all upgrades. $2k installed, yikes! But probably solved.

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