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TPM readings blank with one tire in yellow but pressure is fine

I noticed the tire pressure warning sign earlier today. I went to the Service Tab to see the readings. The the front R and Rear L were 41 as expected. Front L and Rear R were not giving any readings. (just couple of dash signs) - but with the rear R in yellow.. And then 30 min later, they ALL were showing no readings (with Rear R still yellow). Visually, the rear R tire looked ok. So I went and bought a gauge and it measured 40 (lower than expected but still shouldn't give me warning. I did software reboot and even power all the way down, with the tech support. Even after that, the readings are still all blank with the rear R in yellow. Has anyone had this experience? Not sure if it is related but the rear R was patched by Tesla (for a nail) back in early December. This is on Model 3 with Michelin MXM4. Thank you.

TPM2.JPG
 
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smatthew

Active Member
Jun 9, 2018
1,538
2,582
CA Bay Area
Yes, the issue was (1) tire readings not being shown even after driving for a while. (2) rear R showing yellow AND no reading, even though the manual pressure guage reads 40.
The car probably had a reading below 40 - when the wheels were cold. It takes a drive cycle AFTER the pressure is up for the yellow to reset.
And you have to drive at least 30-ish (Tesla claims 15mph, my experience says over 25mph) for TPMS readings to update (Although TPMS will update immediately upon movement IF the tires are dangerously low)
 
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