I don’t solely rely on the TPMS, but it is extremely accurate in this 300 as in previous ones I owned.
The TPMS on my Lexus GS matches my dial-type gauges (more than one) exactly.
What if you switched that problem tire to another location on the car? Does the problem follow the tire, or stay, indicating the problem is with the tire now at that location? Might provide some clues to work with anyway.
How does the stabilitrack system work on your car? Does it use the ABS wheel speed sensors? If so, consider there may be something wrong with that particular tire. The way it was manufactured or something. Also yield to the possibility that your own tire pressure gauge isn’t accurate.
You have in-tire sensors, right?
On the GMs I own, the computer will automatically disable traction and stability control if there is a fault in the TPMS. If it cannot rely on the tire/wheel sensor input, it stops reacting to it- a good thing.
I recently resolved an issue in my Trailblazer. Right rear speaker would have whistling noise that varied with engine RPM. Turns out to be a rather common fault but not many understood the real cause. I used the info I gleaned from those reports to track it down the the rear seat audio control. Simply tapping on the unit would resolve the issue for a short period but then come back. I disassembled the entire unit and inspected all of the circuit boards. Finding no smoking gun, I started inspecting the wiring harnesses. Bingo, found a bad crimp on one of the wires. How much you want to bet that most of the trucks with the problem have the same bad wire crimp?
The point is, dealerships are terrible choice for this kind of troubleshooting. Takes too much time and effort to be economically feasible. I’m betting the OP has a similar situation. A bad wire connection- that is why they talked about changing the connectors to the ECM/BCM/PCM. Fits with the scenario- fiddled with it, went away but then returned again later and it’s not any of the common things they check for…
So what, they charge by the hour.
Well, perhaps you would pay a bill like that but most people wouldn’t. Economic feasibility is not about the company doing the work, it’s about the person that owns the car and has to pay the bill.
Since the problem with the TPMS started again it can be any 1 of the tires or all 4 at once and besides this problem the car is amazing. I just want to know why this is happening, the car has been to 5 different dealers and the company that BUILT the car cant even figure it out ? I did have the tires switched from left to right but it did not help,and the it has the in tire sensors. Thats why i ask about the BCM & the PCM because after all this time and multiple dealers I don’t think it has anything to do with the TPMS.
Twin Turbo is exactly right on. Sometimes you just gotta do it yourself. This car was under warranty but someone has to pay for it. The manufacturer already paid out quite a bit and the dealer is not going invest a couple thousand in labor if the manufacturer is not going to pay them. Plus how many people would be willing to pay several thousand dollars to trace a TPMS issue?
that depends on which side of the fence you are on.
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It has not cost me anything so far except for aggravation, I am just obsessed with finding out why !
So what happened when they swapped the tires left/right? Did the problem move to the other side of the car? Or did it stay on the same side?
Very important question . . .
When the tires were switched side-to-side . . . did the mechanic reinitialize the tpms, so that the module KNEW the sensors were now in different positions?
The problem stayed on the same side after the switch, left rear at the time & they did reinitialize the tpms. This was all before they replaced the ECM and like I said it lasted 5 months but now its always multiple tires if not all 4 tires. Thanks !!
If you are subject to car inspections, this may not pass! This is a safety issue. Shouldn’t the OP go over the dealer to have this issue handled?
I think that by accepting the $3000.00 and two car payments the manufacture and dealer can say they have met their end .
If the code showed the same tire position after you swapped the tires around then the tire sensor inside the tire must not be the problem. B/c if it was, then the trouble code would have switched to the tire’s new position. Doesn’t solve the problem, but provided a good clue anyway. I guess that’s why they replaced the computer. Have you looked at a design schematic showing all what’s in between the sensor and the computer? Since it isn’t the in-tire sensor, and not the computer, it seems likely it must be something in between.
Now you’re just being ridiculous. If the shop goes ahead and does the work for an outrageous amount of time and money and the customer cannot or will not pay, does it really matter WHICH side of your theoretical fence you’re on?
Was the BCM replaced? Do you have an Easy Pass? Interference from it could cause it.
BCM has not been replaced but was asking about it & never used ezpass in car. Thanks !