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Issues with Sonoma 4x4

Mkidd12Mkidd12 Member Posts: 1
edited July 2019 in GMC
So basically I’ve got a ‘97 Sonoma SLS 4x4 with the 4.3L. Last week I got stuck in some mud and attempted to get it in 4wh low to get out. I haven’t tried it in probably 6 years because I thought the 4 wheel drive quit working a long time ago. Well it engaged from 2hi - 4hi - 4lo. But it won’t disengage 4lo. Doesn’t matter if it’s in neutral, park, shut off for a couple days, nothing. I hit the button selectors and they just flash. Pulled the battery out to look at the vacuum acuator. Found a hole in so I replaced. Should of fixed it right? No. Not at all. I know enough that I’ve been able to fix the other things that have gone bad in my 250k miles I’ve driven it. But I’m at a loss on what and where to check now. It’s my everyday driver and I feel like I’m 12 again having to either walk or ask people for rides. I just need it back in 2wh so I can drive it again. I don’t even need the 4 wheel drive anymore. Any suggestions would be helpful.


  • PF_FlyerPF_Flyer Member Posts: 9,372
    Could be a vacuum leak, but you seem to have eliminated that possibility Since you have the button selectors, it could be an issue with the buttons themselves, or the transfer case control module, or transfer case shift motor. Given that you haven't used 4wd I think I'd lean towards a mechanical issue with the transfer case.
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