Question about GMC 2006 Envoy XL SLT

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Front actuator and transfer actuator engages but 4 wheel drive still will not work

Pulled the front actuator and made sure it engaged re installed re activated 4 wheel drive checked to make sure front drive shaft engaged it locked in ???????

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Sounds like the needle bearings inside the disconnect are bad. most generally the outer bearing that rides on the cv axle. bearing detonates and the axle drops just enough to misalign the engagment. bearings are replaceable.

Posted on Jan 07, 2015

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1990 GMC suburban actuator and fuse location. There is not one on front differential and no place for fuse in fuse block. 4 wheel will not engage. No owners manual


The actuator will not be on the front differential or drive line, it will be on the transfer case, which is mounted behind the transmission. Follow the front drive shaft back from the front differential, and the component at the rear of the driveshaft is the transfer case. That is where four wheel drive is engaged/disengaged.
I'm not familiar with your vehicle, but if you have a separate lever to engage 4wd, there will not be a fuse for the actuator - it is a manual system. If the 4wd is selected electrically, check that all wiring and connectors on the transfer case are in good condition.

Sep 25, 2016 | 1990 GMC Suburban

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4 high won't engage but 4 lo and 2wd work fine


Check for power to the front differential actuator. This actuator slides a gear in position to lock the differential to drive the front wheels. If you have power and ground to the actuator when in the 4HI position, the actuator has gone bad.The 4LO is only engaging at the transfer case, but the front wheels are still not engaged if it is not working in 4HI.

Feb 25, 2015 | 2003 GMC Sonoma Extended Cab

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4 Wheel drive (Manual trans) not engaging


First, IF your vehicle has a true manual-engage for the 4-wheel drive, then you either have a linkage that needs adjusted, or there is a problem inside the transfer-case (ie- broken shift-lever, broken chain, or loose gear, depending on which metod of drive it has (they WERE gear-to-gear, in my 1981 Isuzu, which means no chain to break...)
OR- if your vehicle has the same system of activation on the 4-wheel drive, as the Chevrolets of that era (Isuzu and Chevrolet were together and may still be), it's probably a vacuum problem. See, there is a vacuum-pot that pulls the cable to actuate (lock-in) the front-axle, using vacuum from a line on the transfer-case (vacuum that comes from the engine). IF there is a hole in any of the lines &/or if the vacuum-pot itself has a hole in it, then your 4-wheel drive linkage (on the front-axle) WON'T be pulled-in, so it won't engage, at all. This happened to me in my 2000 ZR2 during a snow-storm! It clicked, but wouldn't engage.
Go online or get a reference-manual from Oreilly's, Autozone, etc. to see how your system is actually actuated.
If it is manually actuated, then look for a linkage or a line that needs adjusted (HOPE it's not inside the case!) or IF it is vacuum actuated, then you can test it by starting the engine and spraying all the lines and the vacuum-pot with WD40 or other aerosol, to see if the engine revs- which will tell you where the problem (leak) is.
Either way, GOOD luck!

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Have a 1985 chevy s10 pick up & the 4 wheel drive wont engage. I already replaced the solenoid on top of the transfer case, & it still wont engage. I can hear the transfer case engage & I have vacum at the...


Make sure that the vacuum hose connector is connected AND connected correctly at the transfer case and at the front differential. If that is all right and the front differential still doesn't engage, then you need to test the vacuum actuator at the front differential.

Oct 25, 2013 | 1985 Chevrolet S-10 Blazer

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1995 gmc jimmy...won't go into 4 wheel easily...took me about 45 minutes today to get it to engage, going back and forth and it seemed to engage and then "pop" out. finally engaged and stayed...


There are vacuum lines at the rear of the engine that t-off into different directions. These can become deteriorated with age and get mushy and collapse. The main culprit is underneath the battery tray. You'll have to remove the battery and the tray to get t it. The hose is connected to a vacuum actuator that controls the front axle engagement. It is always coming loose because of the sharp bend in the hose where it hooks up to the actuator. There is also a hose that runs down to the transfer case. While you're under there checking those vacuum hoses, go ahead and check the electrical connections at he front axle and the transfer case.

Jan 05, 2011 | GMC Jimmy Cars & Trucks

1 Answer

I have a 1992 K-1500 truck with a 4.3 engine. The four wheel drive will not engage. I have replaced the actuator and the transfer switch already. The front drive shaft will turn but the front end still...


take actuator back out then plug connector back on it but leave it out of axle now turn key on and shift into 4 wheel drive if actuator moves out then problem in in front axle u need to pull right half of axle apart if it doesnt move then it electrial problem to actuator check fuse

Feb 09, 2010 | 1992 Chevrolet K1500

2 Answers

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

4 Answers

I have a 1990 K1500 4X4 Chevy pickup that wont engage into four wheel drive. I bought the truck from a friend who had just replaced the actuator on the front end but that did not cure the problem. The...


I had the same problem on my 90 K1500, it was the 4 wheel drive actuator unit itself. Bout it at the local parts store for 30 bucks and installed it in 10 minutes or less - and vavoom! 4 X 4 back in business.

Sep 27, 2009 | 1990 Chevrolet K1500

3 Answers

4 wheel drive not working


when you engage it in 4 wheel make sure you are getting vacuum to the acuator just pull the hose off and feel to see if there is vacuum if not check all vacuum hoses

Jan 14, 2009 | 1996 Chevrolet Blazer

1 Answer

My transfer case is permanently engaged but no 4 wheel drive...


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.

Jan 08, 2009 | 1999 Chevrolet Blazer

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