Hey there! Last week I started getting a message on my cluster, kept ringing service shifter, would come and go, but over a week, it would be constant every 2 seconds, then it finally stopped. But it would still appear in messages. Took it to the dealer. My truck has approx 50,000 k’s. They needed to keep it over night as they couldn’t figure it out, they said it kept showing many error codes. Finally they decided to replace the shifter, I have the dial knob. It worked. Apparently the lock feature wore out and needed to be replaced. Warranty covered it, now it’s good as new!