TPMS or Valve stem

[ramhaulerx54]

2011 ram 2500 6.7

Low tire pressure light came on. when I went to fill up the tire, it didnt let me. Air was not going into the tire. Could it be a faulty TPMS sensor or valve stem and if its the sensor, can i just replace 1 or do i have to replace all 4

 

[tidefan1967]

Something is probably wrong with the valve core or maybe your air chuck. If its the valve core you can replace it in a matter of minutes. I always keep a few spares of things like that for just such a situation. You can get a valve core removal tool and a valve core at your local parts store. I doubt its the TPMS sensor.