Any good size tire shop can read the sensors and let you know if they are working, battery condition, etc. These sensors have a life of about 6-8 years, so if yours are original they are toast. Good luck, Lee.

 

I have the FIXD OBD app/reader, and it doesnt display TMPS readings... much to my surprise. I've got a light on too.. all tire pressure is good (including the spare).

I bought new sensors with new wheels/tires about 3-4 yrs ago.

 

The TPMS reads only 4 of the possible 5 wheel based sensors. Plus, the wheel based sensors will automatically turn 'off', after a while if the wheel is not spinning (to preserve battery life).


If you have a 2011 with the original factory sensors + batteries, I would say it could be possible the wheel sensor batteries are near-death (or already pasted it).


The TPMS has a hysteresis built into it. Just for example, your TPMS is set to 37 psi. The warning light will not go 'on' until pressure in one or more tires drops to, say, 32 psi. However, to get the warning light to go back off, you need to re-inflate the tires all the way back to 37 psi. It will not reset with 33 psi, nor even 36 psi. BTW, let me mention again that the wheels need to be spinning to ensure the sensors are indeed 'on'. Otherwise, the TMPS will continue to use the old psi value.