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:confused:WE JUST HAD OUR FIRST SNOW FALL IN PA. IT SNOW LESS THE 2 " AND I PUT MY 2003 TAHOE INTO AUTO 4WD BUTTON ON. WHEN I GOT HOME ,LESS THE 3 MILES I PUT IT BACK INTO 2WD AND A SEVICE 4WD CAME ON THE DASH THAT I TO SEVICE THE 4WD.. WHAT DOES IT MEAN? AND WHAT DID I DO TO THE TAHOE?

VINCE
 

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When the service 4wd light comes on, it means that the transfer case control module (TCCM) has detected a fault (analogous to when the service engine soon light comes on). SOP would be to find a shop with the proper equipment to read DTC's from the TCCM.

It seems that these have frequent problem with the switches.
 
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