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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[McSquashy]

Update #2:

Without changing or doing anything, the TPMS faults have actually become less frequent over the past couple of days.

When leaving work yesterday, I noticed that all four sensors were being detected until I got close to home, at which point only the rear two tires faulted. Then, this morning was the first drive in quite a while where I didn't receive any TPMS faults at all on my commute to work.

Just a reminder, three of the four sensors currently installed in my GTPE wheels are the same sensors that auto synced to the car when I first purchased the wheels two years ago. The fourth sensor was recently replaced when I purchased a replacement tire.

Also, all of the sensors in both my GTPE and Rally wheel sets are OEM 315 MHz sensors.

Edit:

I should mention that I haven't tried disconnecting my FitCamX to see if it's causing interreference. I think I've been reluctant to do so because I'd be very disappointed to find that's the culprit. That said, it's seeming more and more likely that intermittent signal interference is what's causing the issue.

 

[Mach-Lee]

Update #2:

Without changing or doing anything, the TPMS faults have actually become less frequent over the past couple of days.

When leaving work yesterday, I noticed that all four sensors were being detected until I got close to home, at which point only the rear two tires faulted. Then, this morning was the first drive in quite a while where I didn't receive any TPMS faults at all on my commute to work.

Just a reminder, three of the four sensors currently installed in my GTPE wheels are the same sensors that auto synced to the car when I first purchased the wheels two years ago. The fourth sensor was recently replaced when I purchased a replacement tire.

Also, all of the sensors in both my GTPE and Rally wheel sets are OEM 315 MHz sensors.

Do the faults occur as a specific physical location? Like "the sensors usually fault shortly after I drive past X"? And how long is your commute?

 

[McSquashy]

Do the faults occur as a specific physical location? Like "the sensors usually fault shortly after I drive past X"? And how long is your commute?

Yes, typically all four sensors are synced when I leave home each morning. They continue to work normally until I reach roughly the same point on my drive to work, at which point the TPMS fault appears. My commute is about 14 miles each way.

When leaving work, I usually have the TPMS fault from the start, and the sensors remain faulted for the entire drive home. Nothing changes until the car sits overnight.

That was the pattern, at least, until yesterday. When I left work, all four sensors were still synced and functioning normally. It wasn't until I was on my way home that two of the sensors faulted.

BTW, in case you missed the edit to my last post, I haven't gotten around to unplugging my FitCamX yet. I'll attempt to do that this evening and report back in a couple of days.

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