I just bought a used 2014 RAM 2500. The tire pressures all read blank --, but the TPMS seems to be working otherwise as the pressure alarm light turns on when pressures are low and off when they are good. The display readings were blank when I got it, then worked briefly for a day and then went blank again. I'm not sure of the communication signals between the TPMS and the instrumentation display, but all other display screens/parameters appear normal. If some one has has insight, it would be greatly appreciated as I've been unable to find any help and I'm reluctant to take it to a dealer ($$$$). The problem might be with the TPMS module but I'm not sure. Regards

 

Go to Americas Tire, they can test the individual TPM sending units.