1999 GMC Envoy 4 wheel Dr.

1999 GMC ENVOY
125,000 MILES • 6 CYL • 4WD • AUTOMATIC
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RANDY BURKE
  • MEMBER
  • 1 POST
will not shift into 4 wheel Dr. I tow the vehicle behiind a Mt Home with transfer case in N with no problem, but will not shift the front diff.
I can hear the transfer case go to low range when
activated to 4 wheel low, but all I get is flashing lights
when I try to shift into 4 wheel. checked the actuator under the
battery and it has no vacuum when the switch is acivated.
Is it the buttons or the controller at the passenger kick
panel? Need a vacuum diagram for the accessories.
Than You
Dec 11, 2009 at 4:12 PM
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DOCFIXIT
  • ✓ASE Certified Mechanic
  • 18,828 POSTS
  • ASE Certified Mechanic
Hi
If haven't done so have PCM scanned for codes. On New Venture transfer case 236-246 engagement is by an electric motor.
Dec 16, 2009 at 8:44 AM
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