Question about 2000 Chevrolet Blazer
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Posted on Jan 02, 2017
It sounds like the encoder motor. That's the black plastic box on the driver's side of the transfer case. But just to make sure, the control module for the encoder motor is located behind the passenger side kick plate (inside the vehicle, passenger side, where your feet would be, outside side). Disconnect it for a few seconds and then reconnect it. If the problem still exists, you will have to repair or change your encoder motor. I grabbed one at a scrap yard for less than $100.00.
Posted on Jan 04, 2009
I had the same exact problem with my blazer, what you described seems like some of the symptoms of your 4 wheel drive eventually not working. soo here's my best shot
2 common problems that cause this are the vacuum switch on the transfer case and the vacuum actuator mounted under the battery tray. When the switch on the transfer case goes bad it pulls fluid out of the transfer case and pumps it into the actuator and destroys it. The switch only costs about $15 and are usually stocked at major auto parts stores. The actuator ranges from about $50 to $120 and most of the time need to be ordered. If you reach under the battery tray with the 4wd engaged and follow the cable you will feel the end of the actuator, make sure that it is pulling back. If not either the switch or actuator or both are bad. Hope this helps.
Posted on Jan 11, 2009
Don't go tearing into this yet! It could be your transfer case encoder motor if it is wearing out it could be making a lot of noise when trying to shift. And if it can't shift into 4 wheel it will automatically go back to 2 high eventually your 4h button wont allow you to try and shift it and it will automatically go into neutral if you try. But if this isn't your problem your looking at a problem in your planetary gears because everything else is moving already in your transfer case that is the only thing I can think of unless its a problem in your front end. Three things mechanically when you shift into 4 wheel drive your encoder motor shifts your actuator in your front end engages and your gear selector fork moves your sprocket from 2h to 4h in your planetary in the transfer case good luck. I put my money on the shift encoder motor. I'm no expert just a poor guy who fixes his own rigs, I own a 2004 gmc sierra and have dealt with 4 wheel problems in the past good luck.
Posted on Dec 04, 2011
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