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2001 Chevrolet Blazer: 4WD Lights won't come on. Will not switch from 2WD to neither 4WD High or 4WD Low.

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These 4x4 units are controlled by a module in passenger kick panel. water leaks onto module and after time is corrodes the connectors and the unit. check for this and repair where needed

Posted on Sep 11, 2009

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  • Master
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Little hint the switching of transfer case involves a vacume hose that is ran from the engine....let me know?

Posted on Sep 11, 2009

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Posted on Jan 02, 2017

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1 Answer

What is wrong with my 2000 chevy blazer ; it is a 4wd automatic an i locked it in 4wd low to pull my boat out of the water and can not get it to shift back i to 2wd?


You shouldn't have to use 4wd to tow a boat out of the water. Does your truck have a 2wd button or just the 4high and 4low button? If you have a 2wd button, put tranny in neutral and then hit the 2wd button. If you just have the 4high and 4low button, put the tranny into neutral then press the 4high button twice (Once to get back into 4high, then again to get out of 4high and back to 2wd).

Jun 04, 2014 | 2001 Chevrolet Blazer

1 Answer

Hi my name is chris i have a 2001 chevy blazer 4x4 for so reason it keeps putting itself into 4x4 when i stop at a light or stop sign and won''t let me put it back into 2 wheel drive ?


There's been a lot of problems with the 4wd systems on the blazers of that vintage. The only sure way to track down the cause is to have the system scanned. Some of the most commom causes are: the switch in the dash, - the control module, - the transfer case . There are other issues if it has auto 4wd as the ABS system is tied into that system to activate it when the sensors sense wheel slippage. If your blazer has the auto 4wd funtion and has a ABS light on, it could be in the ABS system.
IF you could get it back into 2wd, you could pull the fuse to the 4wd to dis-able untill you have a chance to have it scanned.

Jun 24, 2011 | 2001 Chevrolet Blazer

1 Answer

Have 2005 chevy silverado stuck in 4wd-lo will not shift to 2wd all lights are out checked fuses are fine


If all the lights are out then the 4wd switch is bad but,if it won't come out of 4wd-low then the 4wd actuator is bad or stuck.The 4wd actuator is what engages the differential from 2wd to 4wd.HOPE THIS HELPS!!!

May 02, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Truck changes from 2wd to 4wd high and 4wd low by


probably a bad 4wd switch have it checked I had sort of the same problem after dealer put factory fog lights in shorted out 4wd switch

Dec 19, 2009 | Chevrolet Silverado 1500 Cars & Trucks

3 Answers

I just bought a 2001 blazer 4.3 4wd and it was stuck in 4 low


It should tell you on the Shifter whether or not that you can Shift on the Fly. Check the Manual first if there is one in the Truck. Some Models had this and some Did not. Was an Extra from Factory Option.

Dec 31, 2008 | 2001 Chevrolet Blazer

1 Answer

No 4wd high range


checkunder the battery pan there is a bellows type of thing acid got on mine and ate the connection up i replaced this unit and 4wd worked by the way u only have 2wd low the transfer case has shifted the the trannie output to low range rear tires will spin not the front the cable that broke shifts a fork in the front pig 2 get the front wheeles engauged not a master tech it happened to me bout 4 years ago

Dec 01, 2008 | 1995 Chevrolet Blazer

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