electric 4x4 push button and light flashes

Asked by Dec 05, 2014 at 11:09 AM about the 2003 GMC Sonoma SLS Ext Cab 4WD

Question type: Maintenance & Repair

4 wheel drive will not clic in

2 Answers

19,880

Check the vacuum module under the battery try first. (Two of the I believe 4 bolts come in from the wheel well on the passenger side.) It looks like an old cruise control unit. The rubber gets old dried out and brittle. It can't hold vacuum then. Easy to change NAPA sells them for about $50-$60. If it's not dry rotted and holds vacuum let us know and we can go from there.

19,880

tray not try, sorry

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