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Posts Tagged: TSB 05-04-21-003B

Service 4WD Light on

How to fix a Service 4WD Light on, C0374 on GM vehicles GM has issued a technical service bulletin (TSB) 05-04-21-003B to address a Service 4WD light on, C0374 on GM models: 2004-2007 Buick Rainier 2003-2007 Chevrolet Avalanche, Silverado Classic, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT 2003-2007 GMC Envoy, Envoy XL, Sierra Classic, Yukon, Yukon XL 2003-2004 Oldsmobile Bravada 2005-2007 Saab 9-7X In addition to a lit Service 4WD light, you may notice erratic operation of the 4WD or AWD, especially after driving in rain, snow, or after going through a … Read More

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