Temps question

[Jim82nd]

I have a 2016 malibu ltd. My temps shows all four tire with no pressure. Just —- on each tire. History- The system showed one tire the both front tires and with in a week, all four. This wasn't long after getting two new tires.
I followed the manual for a reset but it didn't work.
Do i need a new computer?

Thanks

 

[zora]

Each sensor has a battery. Did the tire dealer replace the sensors when you got new tires? If not all of them failed.