No 4wd. on 1999 gmc sonoma

SOURCE: service 4wd light

what causes the 4wd to kick in when you have it in 2wd

autodr

• 260 Answers
• Posted on Nov 23, 2008

SOURCE: 1998 jimmy 4 wheel drive problem

are any of the lites on the switch flashing? you may have a sticking 4x4 shift motor on the transfer case. with a helper, key on someone under vehicle at shift motor, one operating the 2wd button, give shift motor a rap with small hammer on metal portion of shift motor to see if you hear it trying to work. to access control module, remove plastic right kick panel and its right there. remove connector and inspect for corrosion or bad connection. also try park and neutral, may even have to be rolling a bit to disengage. let me know how you make out and will help further if i can. do you know what transfer case system you have? np1 or np4?

SOURCE: 1999 gmc jimmy stuck in

need to check the fluid in transfer case

SOURCE: 2000 gmc yukon xl 4x4 wont engage

see my posting re this at my name: rlf107. $115 in parts and labor solved for me, on a 2000 Yukon XL

SOURCE: 4wd will not engage on my 1996 GMC Sierra 1500 pickup

Ok the drive shaft will spin thats good. remove the front driff actuator and see if the plunger extents. if it doesn't check that the power and grond ar ok. If they are then replace the actuator. Just so you know the two actuator may be diffrent. If it has been replaced no problem. If it hasn't ever been replaced then ther is a updated part it come as a kit witha harness spacer and actuator.

Testimonial: "Fixya pointed me in the right direction to find the problem. It was in fact the front actuator which was not expanding. The 4wd is working. Thanks."