I have 163K miles on my 2011 RAM 2500 with the diesel. This message popped up about a week ago. No idea what service I should perform. Also the TPMS is always showing my rear tires low with values from 0 to 68. I had them checked - running 75 lbs. in both. When I rotate tires, then it will the front tires showing low. Just put new tires on 1000 miles ago, too. It's been going on for 3-4 months.

Edit: I've never seen this message come up before and I've owned it since new.

Any thoughts would be appreciated.