Question about GMC Sonoma
Posted by Anonymous on
Sounds like its tring to enage but won,t. making a moaning noise. changed shift cable and actuator
Posted on Oct 12, 2014
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Posted on Jan 02, 2017
SOURCE: 4x4 wont engage
First thing to make sure of is to check for a blown fuse. The fuse location is marked 4WD and it should be a 25 amp fuse. If the fuse is bad, the lights on the 4wd console wont light up. If the lights do light up, then you can move to the transfer case. On top of the transfer case, toward the rear of the truck is a switch that has a 2 wire connector. That switch sends power to the front axle actuator when you try to enagage 4wd inside the truck. That could be bad. The switch is threaded into the transfer case and is still available through GM. If the switch is ok and the wiring that attaches to it is ok, then you can move up to the axle. Threaded into the front axle is the front axle actuator. These actuators are prone to failure in older trucks and is very prone to cold weather failure. You can test the actuator by removing it and then WITHOUT the truck running, put the truck into 4wd and then turn the key to the hot position. The plunger inside the actuator will extended outwards. More than likely it will be one of those 3 things. If it still wont engage, you may have a short in one of the wiring harnesses associated with the 4wd system. Also, you may have a damaged transfer case. To check the transfer case, put the truck in 4wd without it running and then crawl underneath and see if you can turn the front shaft by hand. If not....it's good. If you can....then the shifter forks inside the case are worn or damaged. I hope this helps.....start small and work your way up!
Posted on Jan 31, 2009
If Your Front CV shaft is broken it will not engage...Shaft can be in visibly good shape, but you might hear a knocking sound or a shutter when turning sharply. I had this problem this last winter. Get under the truck and try and turn the CV by hand. if it can be rotated, it is bad.
Posted on Jul 05, 2010
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