Truck Forums - 2003 sierra 4wd trouble

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jswc61

02-20-2010 11:50 AM

2003 sierra 4wd trouble

2003 sierra 4x4.... 4wd doesn't work in 4HI but works perfect in 4LO... what might cause this

GMC89

03-21-2010 09:31 PM

Transfercase??

Sounds like it to me...Something buggerd up inside.

electech

01-21-2023 09:12 PM

Remove the TCM fuse for a few and reinstall. This fixes mine when showing neutral red but still in 2wd.

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