what is the most likely problem when service 4wd light is on randomly on 2006 Chevrolet Silverado 1500

Service 4wd message Diagnostic code CO327 and CO379

Asked by for the 2006 Chevrolet Silverado 1500
1 answer
transfer case may need to be serviced. possible dirty connection. bring to a tranny shop and have them run a diagnostic(more thorough). tranny tech. advise.