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4WD not working properly - 2003 GMC Sonoma Extended Cab

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Check the wire on the crankcase the terminals corode

Posted on Mar 30, 2009

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05 envoy 4wd not engaging


Most likely cause is the encoder motor on the transfer case. This is the motor that activates the transfer case. Usually sets a code so you may want to have it scanned.

Feb 12, 2015 | 2005 GMC Envoy

1 Answer

4wd not engaging. Check actuator and seems to working properly. Jacked front end up and and when in 4wd the front tires spin freely. Any suggestions?


Does the driveshaft for the front wheels turn when in 4wd? The actuater might work but the diff lock for the front wheels might have broken. If the front driveshaft does not turn when in 4wd, the transfer case might be the problem.

Jan 02, 2014 | 2008 Chevrolet Silverado 2500HD

1 Answer

My 1997 GMC Sierra lights for 4hi and 4lo blink when i push the 4hi button and then goes back into 2hi. but when i push 4lo it locks in and works fine. I tried changing the 4wd motor on the transfer c


THE TRANSFER CASE MOTOR IS ONLY FOR 4WD LOW. That would have never been the problem as soon as you confirmed it shifted into 4wd Low. 2wd and 4 Hi work off of vacuum. You may have one or two issues. A vacuum leak up by the front axle that engages the 4wd HI or the sensors on the transfer case.

Nov 22, 2013 | 1997 GMC Sierra

1 Answer

While driving the 4wd will turn on, and the dash switch lights jump


This sounds like the sensors on your trans-axle for the 4wd is either getting to much power or a loose ground thats deverting power i would recommend checking the sensors with your DMM If those are working properly follow your ground leads make sure there properly secure....If these all check out then i would check the computor (PCM)

May 27, 2011 | 2002 GMC Envoy

1 Answer

My 4 wheel drive selection switch lite does not work. Does the 4 wheel drive system still work properly?, or is it an indication that something is wrong?


Drive to a dirt or gravel surface and push the 4wd button. Take off fast enough to spin the tires. If only the back tires spin, then 4wd is not working.

Jan 30, 2011 | 2006 GMC Envoy

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Can some explain the proper way to shift from 2wd


4wd auto: you can shift into this mode at anytime. it is good for conditions where you might need 4wd.
4wdhi:: you can shift into this at speeds up to 30mph and both of these back to 2wd while in gear.
4wd lo : stop vehicle and shift truck into nuetral ok to be rolling around 3mph shift into 4lo then put in gear same when shifting back to 2wd

Feb 19, 2010 | 2001 Chevrolet Silverado 1500

2 Answers

Front end growls when in 4 wheel drive


Before using the 4wd, did you have the transfer case, front differential, and front axle locking hubs inspected, properly lubed, and tested? No one ever does, so don't feel bad if you don't know what shape the 4wd components are in. You probably haven't used 4wd in last five months. Most people don't ever put their 4wd vehicles in 4wd mode, even though the service manual says to operate the vehicle for a minimum of 10 low speed miles every 3000-4000 miles. This helps maintain the proper function of any limited slip parts, internal bearings, and gear components. Operating in 4wd periodically also helps insure any electric devices are working. What you may be hearing is the unused front differential parts, transfer case bits, or electrically controlled locking hubs wearing out from the lack of use, proper maintenance, or just plain age (after all you did say it's a 2001). Front pinion and differential bearings are not usually ever spun/rotated unless the transfer case and hubs are locked in 4wd. If they were starved of gear oil, or dry when you went 4wheeling, you torn them up. Refer to the owner's manual (if you still have it) for proper 4wd opration. You'd be surprised that there are proceedures to do in order to maintain a reliable vehicle. Don't ever just drop it in gear and expect it to work..... I mean come on.... after all, It is a Dodge! Your next step is to find a full service mechanic, with a complete selection of tools and shop supplies (especally a hydrolic press) and schedule an appointment to have the 4wd front components inspected and replaced if neccessary.

Oct 10, 2009 | 2001 Dodge Durango

1 Answer

Front tires wont pull in 4wd


You have an actuator on the front axle, check for power or pull out and check for damage. You can also check for proper working while out ,make sure ground is good.

Jan 16, 2009 | 1998 Dodge Ram 1500 4WD

2 Answers

4WD Hi does not work on 96 Chevy K1500 Suburban


we had this same problem, under the car there is a modular,near the transfer case, it just unlugs and plug a new one in.20 min.. it is approx. $80.00 item,$ 350.00 to have it done. we were in yellowstone when we had this problem. hope this helps

Jan 08, 2009 | 1996 Chevrolet Suburban

2 Answers

1998 ford expedition 4x4 not working transfercase works


Today I fixed the vacuum lines to the front differential (nee transaxle). I had trouble finding parts in the local auto store that would do the trick - but I got something cobbled together. Based on my experience, I can go back to the store and get the right parts for a proper fit.

As of now, 4WD will engage but will not disengage - clearly one of the connections is still poor, or I accidentally switched the ports, or the vacuum shift motor (attached to the front differential) is shot (obviously from abuse).

As near as I can tell, once I switch into 4WD-HI, it will not shut off. 4WD-LO will engage and disengage properly. If I turn the car off for a while, a couple of times 4WD has disengaged. Hmmm...

Jan 02, 2009 | 1998 Ford Expedition

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