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Posts Tagged: Service 4WD light on

Service 4WD light on GM

Service 4WD light on, trouble code C0388, C0374 General Motors has issued a Technical Service Bulletin #05-04-21-003C to address a problem with their 4WD vehicles where the Service 4WD message may appear or the 4WD light stays on. The TSB applies to the following vehicles. 2004–2007 Buick Rainier 2003–2006 Chevrolet Avalanche, Suburban, Tahoe 2003–2007 Chevrolet Silverado Classic, TrailBlazer, TrailBlazer EXT 2003–2006 GMC Yukon, Yukon XL 2003–2007 GMC Envoy, Envoy XL, Sierra Classic 2003–2004 Oldsmobile Bravada 2005–2007 Saab 9–7X with Four Wheel Drive or All-Wheel Drive and Active All-Wheel Drive (RPO … Read More

Service 4WD light on Check engine light on

Service 4WD light on Check engine light on Service 4WD light on, can’t shift into 4WD, 4WD shift doesn’t work, transfer case motor doesn’t work on Avalanche, Silverado, Suburban, Tahoe, Ram, Sierra, Yukon, Check engine light on Cardone, a leading manufacturer of rebuilt transfer case motors has issued a service bulletin advising shops of a reason why a brand new Cardone motor may not work properly. In fact, the same problem may be the root cause of the factory transfer case motor not working. Apparently Chevrolet, GMC, and Dodge ground … Read More

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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