Glitch in Chevy's Four-Wheel Drive
Some owners of 2007-2013 Chevy Avalanche, Tahoe, Silverado or Suburban vehicles may comment on a service four-wheel drive (4WD) message on vehicles equipped with electronic shift transfer cases or the 4WD indicator in the IPC just flashes when the transfer case is shifted to 4WD on manual shift transfer cases. On electronic shift applications, diagnostic trouble code (DTC) C0379 may be a hard code or intermittent. On manual shift applications, the flashing 4WD icon may be intermittent or hard.
If diagnostics do not lead to resolution, inspect the front axle actuator connector for signs of moisture intrusion. If corrosion is found on terminals, replace the actuator and harness.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike MavrigianMike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
