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The "service 4 wheel drive" light is on because the TCCM (Transfer Case Control Module) has detected a problem with the system. The light will remain on until the problem is fixed. Your local auto parts store can read the code(s) in the TCCM. The code(s) will help determine what the problem is.

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9y ago
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Q: How do you turn th serv lfor wheel drive light off on a 2004 trailblazer?
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