4x4 Dash Switch Will Not Stay in 2HI

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Apr 4, 2010 | 10:02 PM

republic

Thread Starter

Beginning Member

Joined: Jun 2009

Posts: 42

From: Southern Illinois

4x4 Dash Switch Will Not Stay in 2HI

2000 Blazer automatic. If I turn the truck off while in 2HI when it restarts it is in Auto 4x4 or 4HI. I do not believe it has actually switched while driving. Recent transmission rebuild, may not be related but I did not have this problem before. Is it safe to drive? Suggestions appreciated. Did my research here on the forum but found nothing like this. Thanks and best regards. Phil

PS Checked it out today and it does change to auto or 4HI while driving.

Last edited by republic; Apr 5, 2010 at 08:41 PM.

Apr 6, 2010 | 11:10 PM

republic

Thread Starter

Beginning Member

Joined: Jun 2009

Posts: 42

From: Southern Illinois

Hope you don't mind me moving this back to the top, still need some input.

Regards

Apr 7, 2010 | 04:07 PM

bigbehr

New Member

Joined: Feb 2010

Posts: 6

I have the same problem I would be interested to hear too.

Apr 14, 2010 | 02:50 PM

republic

Thread Starter

Beginning Member

Joined: Jun 2009

Posts: 42

From: Southern Illinois

Problem persists. Any solutions?

Regards, Phil

Apr 14, 2010 | 02:52 PM

swartlkk

Administrator

Joined: May 2005

Posts: 41,333

From: Waterloo, NY

Bad switch. Bad TCCM. etc...

What testing have you done? Have you had the TCCM scanned for codes?

May 15, 2010 | 10:15 PM

republic

Thread Starter

Beginning Member

Joined: Jun 2009

Posts: 42

From: Southern Illinois

Sorry I did not follow up, Thanks for the advice. For now I have unplugged the wire to the vacuum fitting on the firewall. The light on the switch still changes from AWD to 2HI by itself but since the vac switch is unplugged it doensn't make the transaction.

Regards

Phil