tire pressure sensor help!!!

[circletrack88]

The tire sensors on my 07 Tahoe worked fine then I rotated the tires and magically the service tire monitor light came on. I have tried resetting them per the manual 10 times why do they magically go from working then when you try to relearn them they don't work. I enter the learning mode and I have deflated the LF tire from 40 psi to 0 and go to no honk or anything. Then tried inflating them from 0 to 40 and still no honk. I find it hard to believe that rotating the tires made the tps stop working. What do I do ive repeated the process numerous times with no luck. HELP!!

 

[rockenthebowtie]

Yea those TPS can be tricky for starters those sensors have a battery life of abou 3 -4 years.. do you still have the metal valve stem ones if you have to get new ones there a new style now they come with a black rubber valve stem... any hoot... try filling them up to about 40 psi and let out about 15psi then go back up the TPM needs to see a hogh and a low them a high again you can also try using a strong magnet by putting it in learn mode and holding the magnet next to the valve stem