BBrown2324
New member
Hi everyone Im new to this forum and just looking for some suggestions. I have a 2007 Sierra SLE new body style. And a while ago the service 4WD message appeared and popped on and off and I finally took it to a shop today and they ran the computer check and all that popped up were two transmission codes? Any ideas? The transmission is just as smooth as the day I bought it. We are all baffled. Any suggestions? Thanks for your time.