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I have the left front TPMS not operating... the tires were rotated over one year ago... all was fine until today. What do those lines mean for the left front.... bad TPMS? see pic
Try training all TPMS sensors, and see if you still have the problem after some miles. If it does act up again, more than likely you do have a faulty sensor.
Are TPMS covered under basic warranty? I'm not at 3 years yet and only 21,000 km... also on original tires.
Yes, they are covered under warranty. I've so far had three of my original four replaced at less than 18,000 miles (2017 6.2L purchased Oct 2017). All three failed at different times. Tried to get the last one replaced as I assumed installation errors or material defects, but the dealer would not do it.