4x4
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Starting Member
Joined: Jul 2019
Posts: 1
From: Calgary, Alberta
4x4
2005 Blazer, 4.3, Auto, push button transfer case.
Won't always stay in 4x4H when going from 2x4H. Sometimes won't even select, shows in then drops out to 2x4H
Selects 4x4L okay
Any ideas?
Really need some help here.
Thanks in advance
Won't always stay in 4x4H when going from 2x4H. Sometimes won't even select, shows in then drops out to 2x4H
Selects 4x4L okay
Any ideas?
Really need some help here.
Thanks in advance
BF Guru
Joined: Dec 2016
Posts: 5,610
From: Moscow, ID
The transfer case control modules (TCCMs) are known to fail on these. I had that problem. Look for threads on how the tccm works and how they fail with their symptoms.
Depending on what you mean by "dropping back into 2HI" you also could have a vacuum leak problem. Vacuum is what is used to remotely engage the front axle.
Depending on what you mean by "dropping back into 2HI" you also could have a vacuum leak problem. Vacuum is what is used to remotely engage the front axle.
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watsoncb
2nd Generation S-series (1995-2005) Tech
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Dec 19, 2010 03:01 PM
