Question about 1999 GMC Suburban
I have an auto 4wd push button transfer case. I took the transmission out of it last winter in a snow storm and since then the 4wd hasn't worked and the "service 4wd" light is on in the instrument cluster. I used to be able to try to engage it but it would only make a buzzing noise and revert back to 2wd mode. Now the lights on the switch are all off and it makes no noise at all. Any ideas would be great.
I had this with a C3500 4x4 it was the wiring contection at the transmission please test all these problems as ths may be a cheap fix.
Hope this helps
Posted on Jan 11, 2009
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