2000 GMC Jimmy Won't go into 4wd when cold

2000 GMC JIMMY
105,000 MILES • 6 CYL • 4WD • AUTOMATIC
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NDKING1126
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  • 1 POST
My Jimmy won't engage into 4wd when it's cold (about 35-37F or colder). When it's warmer, it will engage in and out of 4hi or 4lo as it was designed to do. Also, if you engage it while it's warm, park the Jimmy and then restart it the next morning while it's still cold, it will still be in 4wd and will work as expected.
Nov 29, 2008 at 1:37 PM
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KEIL
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I have the same vehicle with the same exact issue. I have not yet isolated the problem, but suspect it to be vacuum related or perhaps electrical contact related. I have found through experience that most mechanical malfunctions such as this are electrical/contact related. Oftentimes the issue can be corrected by tightening a loose wire or more likely re-soldering a circuit board contact that has a hairline crack in the solder.
Feb 1, 2013 at 7:21 AM
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