TPMS WON'T SYNC

[McSquashy]

I would very highly doubt they would do that, because it requires 3rd party software (FORScan) and the knowledge of how to do it. Dealers don't use FORScan or switch on or off config options; they use FDRS, which doesn't typically allow those sort of config changes. FDRS would just have a train TPMS sensors option.

If the exact same sensor was known good previously, then they should be on the right frequency, but I'm not sure if someone swapped or replaced sensors at some point? You said you had a slow leak on one tire, which would kill the sensor battery due to constant low pressure alerts being transmitted. If you injected tire slime, that would also condemn that sensor and force a replacement.

I really think the issue is with the RF layer here. Either the sensors aren't transmitting when they should (while in motion), you have sensors on the wrong frequency, or there is too much RF interference.

Since you said you cannot manually train some sensors (assuming you are doing the procedure correctly), I would suggest you call around and find a tire shop that has a TPMS service tool that can read the sensors and battery status. The shop can trigger and read each of your four sensors to verify they are transmitting good data and the battery isn't low. It's possible you have a dead or bad sensor in one or more wheels of your current set. Once you verify all the sensors are good, then I would move on to worrying about the BCM configuration or hardware being bad.

Fair enough. Thanks for the suggestions.

Just to clarify a couple of things: I didn't use tire slime or any other type of tire sealant, and the sensors currently in three of the four GTPE wheels are the original sensors that came with the wheels and that previously worked fine. When I picked up the nail, I decided to play it safe and purchased a new shaved tire along with a new set of four TPMS sensors. I then had a local tire shop mount the tire and install one of the new sensors.

As for the training procedure, I'm fairly certain I'm doing it correctly. I turn on accessory power, cycle the hazard lights on and off three times until the car enters training mode, then start with the front-left tire by holding the training tool near the valve stem and pressing the button. The LED on the tool lights up red, so it appears to be functioning properly.

I've even tried starting with a different corner after multiple failed attempts with the front-left tire, but had no luck there either. Ironically, the front-left is the corner with the replacement tire and sensor.

As you recommend, my next step is to take it to a shop or purchase a TPMS service tool.

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