Mattusmc21

What was your end result? Did you find another issue or did you take it back to the dealer and if so, do you know what they did to resolve it? I’m just curious because I’ve been experiencing a random “service 4wd” message. It mostly occurs in the mornings after a cold start but once I make it to my destination I can shut the truck off and let it sit for about 5 min then start it again and the message will be gone then my 4wd works fine. I’ve gone through everything checking all grounds all plugs changed fluid cleaned the sensors inspected inside the transfer case but can not find any issues. The only code I’m reading is u403-71 so I was thinking it could be the wheel speed sensors, I did a test on those and they’re all working fine so now I’m at a loss.