Four wheel drive is not working

1995 GMC YUKON
14,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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ODIE HINES
  • MEMBER
  • 1 POST
The four wheel drive will not engage.
Jan 9, 2017 at 10:46 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check the four wheel drive fuse and ilium fuse in dash. then check blue wire on switch to see if that works and finally check blue wire on top of case to see if power is coming to it. finally check gray wire when switch engaged to see if PCM it telling t-case switch to engage.
Jan 10, 2017 at 12:25 PM
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