Just rotated my tires and after 20 miles the low tire light came on. I have an Innova scanner, but that won't help. Any cheap tpms reset tool that might reset it or just live with the light and check pressures.
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Does your vehicle’s TPMS system indicate the tire pressure (psi) of all 4 tires on your instrument gauge cluster (or user display)? On some vehicles like my truck (2009) it just says “Low Tire” but doesn’t state which tire or any of the psi numbers - I have to manually check them myself, so the TPMS system is useless . In your case, it could be the battery in the sensor or perhaps the BCM module.
If you are very curious, you would have to hook up a fancier scan tool (basically an “all system” scan tool) that can scan the BCM module and see what it is “seeing” with respect to the tire pressures at all 4 wheels. On my truck, I have the TPMS light always on and confirmed with my fancy scan tool that all 4 of my sensors work, that they are programmed correctly to communicate with the BCM, that the BCM TPMS system recognizes them (with correct IDs and tire pressures - confirmed against my analog tire gauge measurements). For my truck, if the tire pressures are off by +/- 0.5 psi with respect to each it can set off the TPMS light - so that’s what it was in my case. On my truck it doesn’t display the individual tire sensor readings on the user display in front of me (I have to use my fancy scan tool for that) - so I just live with it.
