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'02 Envoy Service 4WD Light

cheapskate

By cheapskate
in Ask A GM Technician

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cheapskate New Member

cheapskate

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I've seen several posts regarding the "Service 4WD" light and the inability to switch from 2wd to 4wd - on everything from Avalanches to Trailblazers and many in between. My 2002 GMC Envoy started this last night - started it up after sitting in the garage two days - no bad weather for a couple of weeks. Have an appointment at dealership this afternoon for diagnosis.

My question is, when they read the diagnostic codes, is it still just a shot in the dark as to where they need to look or what they need to replace??? I've seen posts indicating that the dealer replaced a switch or a TCCM or a solenoid, but the problem soon returned. It seems that if the codes are worthwhile, they should be able to pinpoint the defective component. These things are basically computers on wheels - are they too complicated for the mechanics or what???

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