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If I push the button for 2 wheel it flashes then goes back to 4 low

Tiny
SHADOWSTRYDER
  • MEMBER
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 110,000 MILES
My Blazer is stuck in 4 low. If I push the button for 2 wheel it flashes then goes back to 4 low. I have checked the relay wiring and also have disconnected the negative cables to try and reset computer. No luck. I was told that the majority of the time it is the actuator as they have a history of going out before the vacuum switch. Is there a way to tell which it is without having to spend 70 bucks for a diagnostics. Or is there possibly a fuse?

Thanks
Don
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Tuesday, May 11th, 2010 AT 11:36 AM

3 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
The transfer case encoder go out on these trucks but to be sure here is the wiring diagrams and a guide so you can check for power and ground to confirm the failure.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

It might be the controller.

Check out the diagrams (Below). Please let us know what happens. Cheers,
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Monday, January 25th, 2021 AT 7:16 PM
Tiny
SHADOWSTRYDER
  • MEMBER
  • 2 POSTS
Yep it was the encoder motor it took me about an hour to install and cost me $145.00 all fixed! I love this site.
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Monday, January 25th, 2021 AT 7:16 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Good to hear, please use 2CarPros anytime we are here to help.

Cheers
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Monday, January 25th, 2021 AT 7:16 PM

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