Service 4WD light on, 4WD inoperative, harsh engagement of 4WD, no communication with transfer case...
Chevrolet technical service bulletin 030421006 for 2004 Chevrolet Trailblazer, 2004 GMC Envoy and 2004 Oldsmobile Bravada and others.
- Bulletin number
- 030421006
- Component
- Power train: transfer case (4-wheel drive)
- Summary
- Service 4wd light on, 4wd inoperative, harsh engagement of 4wd, no communication with transfer case control module (tccm), tccm diagnostic trouble code (dtc) c0550 set. Tt
Owners of these vehicles have filed 93 complaints in the transmission category.
Vehicles covered
- Chevrolet Trailblazer 2004 2004
- GMC Envoy 2004 2004
- Oldsmobile Bravada 2004 2004
- Buick Rainier 2004 2004
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