I'm having some trouble with TPMS, and I was hoping someone could point me in the right direction on correcting it.
After my girlfriend's car battery died, she gets a "SVC TIRE MONITOR" message when she starts the vehicle. If you look at the tire pressures, they all show "--" instead of the tire pressure.
The manual lists the procedure to reset the monitor system, but this does not seem to work. It gives the two short horn beeps indicating it goes into learn mode, but then it does not acknowledge that the tire pressure changes no matter which tire we start on. After a couple of minutes, it exits learn mode automatically.
I've taken it to both a Chevy dealership and a local mechanic. The local guy let me watch what happens when you use the professional tool. He first read the pressures, and that worked no problem. So I know the sensors and batteries are good. Next, he went through the process to reset the error using the actual tool (without introducing or releasing air pressure). After each tire, it gives a quick horn beep to indicate it was successful. After all 4 tires are finished, it gives 2 honks to let you know it is finished. Then when you start the car, it still gives a "SVC TIRE MONITOR" message with no air pressures.
I should mention that I've asked about this on this forum a few months ago, but this time I included a lot of information about what exactly happens when a professional tries to reset the system. In the last thread it was recommended that I try pulling the battery to see if that resets things, but that did not work. It looks like it simply can't remember the values, but I don't know enough about the TPMS system to know for sure. Anyone have any ideas?