Question about 2004 Chevrolet TrailBlazer

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The "check 4 wheel Drive" light came on. What can cause thus

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This usually indicates that one of the actuators for the Transfer Case or Front Differential did not activate when commanded. This problem needs to be diagnosed by someone familiar with 4x4 systems.

Posted on Sep 25, 2010

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You might want to check the depth of the gear teeth,over time the crush sleeve deteriorates and causes the pinion to move out or in and thus you hear the whin

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2002 Chevy K2500 6.6L Push button 4 wheel drive. All lights on buttons are lit up. Service 4 wheel drive is on dash. What would I need to check?


check receiver at transfer case connection get nasty clean contacts
also check to make sure transfer case is working as designed/also check for ground

Dec 19, 2013 | Cars & Trucks

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I have a 2002 Silverado Z71. When I purchased the vehicle the 4 wheel drive did not work. I took it to the shop and they said the Transfer Case Control Module was bad. I replaced it. Everything worked fine...


I would check to make sure the correct ECM is installed in this auto right away before adding anything else to this truck.Check it like the shop should have, this angers me so when i hear this stuff. Neither shop should have been paid for bandage solution. Then get back to me.

Sep 17, 2013 | 2002 Chevrolet Silverado 2500HD

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2002 2500 silverado - 4-wheel drive makes clicking noise some times, mainly when cornering. Now the nose went away, and no 4 wheel drive anymore. 4-wheel drive light is on, but no 4 wheel drive. Vehicle...


well typically is there is a noise when making a turn its caused by a bad cv-joint but if your having problems with the 4 wheel drive i would look at the linkage to the transfer case and make sure there is not to much play or bent or broke rods and stuff.

Dec 04, 2010 | 2002 Chevrolet Silverado 2500HD

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All wheel drive electric swithch will not go 4high or 4 low but do have all wheel drive what does the service 4 wheel drive light mean?


Means a sensor has found an issue with the 4 wheel drive system. I suggest you have fluids checked in the transfer case and gearboxes accordingly. If that isnt it rent a code reader at an automotive store to retrieve the code to lock down exactly whats causing the fault.

Apr 16, 2010 | 2001 Dodge Durango

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2003 chevy silverado 2500 HD when ingageing 4 wheel high on the fly it makes a load clunk and grinding noise


I had a similar problem and had to have the 4 wheel drive serviced. It need new grease. the grease i had was old and it was causing the gears not engage cleanly thus causing the grinding sound until they were realigned.

Feb 10, 2010 | 2002 Chevrolet Silverado 2500HD

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No power to dash 4x4 indicator lights all fuses are good


  • for the lights check the fuse maybe the fuse is bsted and also check the wirings.

Feb 08, 2010 | 2000 GMC Jimmy

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2000 blazer 4 wheel drive problem


It's most likely the "four wheel drive actuator" This is located on the front differential housing. It's cylindrical shaped and has a large hex (about
1-1/4") and two wires coming out of it. Usually they short out and blow the fuse but, I've also seen where they just quit working and sometimes they just get slow to work. The "actuator" has a heating element in it and it warms up, some sort gas, causing it to expand thus engaging the front wheels. In cold weather it may take a minute or so for it to engage, so put in four wheel drive and wait for a bit and see what happens.

Jan 05, 2010 | 2000 Chevrolet Blazer

1 Answer

03 Trailblazer service 4 wheel light activates while turning


check the lubricant in the transaxle, if it is low it will cause the light to come on.

Sep 21, 2009 | 2003 Chevrolet TrailBlazer

2 Answers

Can't engage 4X4 wheel drive or disengaging


Check the actuator (located under the battery plate). Remove the battery, then the plate, and you'll see something that looks like a horn attached to hoses. One side is soft, and may have a hole in it. This will cause the vacuum not to work, hence, your 4WD won't. Good luck!

Dec 23, 2008 | 1996 Chevrolet Blazer

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