Rick's Free Auto Repair Advice

Posts Tagged: trouble code C0388

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


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