Then as others have said, bad sensor or failing battery. One other possibility is EMF interference from a dash cam power brick. However when we have seen that, it usually affects all the tires with "--" readings.
TPMS issue
Got my Volt a few months ago. Had to have rotors and brakes worked on as mentioned in another post, and all has been good since then. I did, though, have a recent alignment done and two new tires purchased. I had the old tires moved to the front and new tires installed in the back since I had put about 5000 miles on my car since it was purchased.
On my front driver side tire, my TPMS tells me, from time to time, there is a problem. It will last for a while (10-15 min of drive time). TPMS has been relearned by local chevy dealer (and when they looked at the tires, they could find no problems with TPMS), and pressure is ok..The sensor shows that this tire has a problem (I'm assuming with low tire pressure), but readings from gauge/digital pump shows everything is ok.
What are possible causes? I'm only familiar with cars that tell you a tire is low, but my Volt measures pressure for each tire. This has happened for about two weeks. Tire warning light goes on. I measure pressure. Tire pressure is ok. Warning light goes off after a few more minutes of driving.
On my front driver side tire, my TPMS tells me, from time to time, there is a problem. It will last for a while (10-15 min of drive time). TPMS has been relearned by local chevy dealer (and when they looked at the tires, they could find no problems with TPMS), and pressure is ok..The sensor shows that this tire has a problem (I'm assuming with low tire pressure), but readings from gauge/digital pump shows everything is ok.
What are possible causes? I'm only familiar with cars that tell you a tire is low, but my Volt measures pressure for each tire. This has happened for about two weeks. Tire warning light goes on. I measure pressure. Tire pressure is ok. Warning light goes off after a few more minutes of driving.
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Do you have a dashcam, other power supply, or aftermarket item plugged in to the car?So frustrating. The new sensor is coming and going. The latest: new sensor installed on rear passenger side a few days ago, two dashes showing up after driving 30 ish miles on new sensor. Two dashes also made an appearance on other rear tire. The new sensor (rear passenger) eventually started reading tire pressure.
This may have been asked and answered, but do you have any power supply plugged in to the car for a dash cam or the like? A "dirty" power brick can emit EMF that interferes with the TPMS receiver. It's happened before.
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