2003 Chevrolet TrailBlazer Logo
Posted on Jan 08, 2010

2004 trailblazer. Service 4wheel drive light comes on and switch will not change drive from 2wheel to 4wheel drive. Problem is intermittent.

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  • Contributor 31 Answers
  • Posted on Jan 14, 2010
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Joined: Jan 14, 2010
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The 4WD in this vehicle is computer controlled. There will be diagnostic codes stored that will aid in proper diagnosis and repair of this problem. As there are several common / expensive failure items, it is best to have the codes read using a proper scanner. Some of the cheaper code readers may not work in this instance and a more professional scanner may be needed to retrieve the codes. Once you know the codes, a better, accurate diagnosis can be made.

FWIW - The encoder motor on the transfer case is a common failure item. The instrument panel switch module is also.

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