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Low tire pressure warning?

Darthbenji

Active Member
Mar 27, 2018
1,003
594
Ontario
Just got a low tire pressure warning on my front left. Showed 36 psi with the others at 46. I got to my office and checked it with the gauge I keep in the car. 46. Waited half an hour and took it for a drive. The error was still there but the pressure on screen reads 46 now. Did a reboot and it cleared and shows 46 all around. I do have my summers in the car as I plan on getting them swapped today or tomorrow. Could the car have read those tires?
 

Trips

"Boring bonehead questions are not cool. Next?"
Sep 22, 2015
1,214
1,402
Omaha, NE
It takes 10 to 15 minutes for the warning to go away after they come up to pressure. In the summer mine are around 38psi and will get to 43 after some driving. It is a little weird that only one was showing low.
 

ChrisH

Active Member
Jun 4, 2013
2,275
981
Milton, wa
My left rear tire always loses pressure quicker than the others. I don’t think it is a leak because it takes weeks but for example yesterday the other three were at 41 or 42 and the left rear was at 38. Went to discount tire to have them all filled up and the left rear was indeed low. Filled them all up to 45 and my warning light stayed on for my 30 minute drive home but it cleared the next time I was in the car
 

Darthbenji

Active Member
Mar 27, 2018
1,003
594
Ontario
My left rear tire always loses pressure quicker than the others. I don’t think it is a leak because it takes weeks but for example yesterday the other three were at 41 or 42 and the left rear was at 38. Went to discount tire to have them all filled up and the left rear was indeed low. Filled them all up to 45 and my warning light stayed on for my 30 minute drive home but it cleared the next time I was in the car
I was surprised by the sudden reported drop of 10 psi on that one tire only. As well as it later being reported back at 46 with no air added, after a long drive.
 

SammichLover

Banned
Dec 8, 2018
2,618
1,542
Yup
I don’t think it is a leak because it takes weeks
That's probably only "not a leak" in that it is a "slow leak". :)

Recommend you first check the tire for a nail/screw puncture somewhere. If left there the leak will eventually speed up. If you can't find an obvious place were it could be leaking you can put soapy water in a bottle and douse your wheel with it. Even very slow leaks like that will start blowing a bubble if you have patience, so you may get lucky and spot it that way. A common spot is along the seal between the rim and tire, because of something stuck in-between. Note that it is possible that the leak is in the rim as occasionally rims will have tiny, pinhole flaws due to manufacturing defect.

If you still can't find it you could have it looked at at a local tire shop. They'll probably pull it off and dunk it in water to find the leak.
 
Last edited:

bogich

Member
Mar 17, 2019
28
50
Virginia, US
My own TPMS experience for reference - I took delivery and after a mile I got low tire pressure warning with RR tire at 20 PSI, I pulled at the nearest gas station to check and add air. It looked fine at 44, added air to get it to 47 and left. Warning stayed. I drove home, checked all my tires and found RL was at 20PSI, not RR as per the TPMS reading. Filled up the tires, set a service with Tesla to remap the sensors. Now after service, I'm still to find if they fixed it, since my tires are inflated well and not alarming.
 

ChrisH

Active Member
Jun 4, 2013
2,275
981
Milton, wa
That's probably only "not a leak" in that it is a "slow leak". :)

Recommend you first check the tire for a nail/screw puncture somewhere. If left there the leak will eventually speed up. If you can't find an obvious place were it could be leaking you can put soapy water in a bottle and douse your wheel with it. Even very slow leaks like that will start blowing a bubble if you have patience, so you may get lucky and spot it that way. A common spot is along the seal between the rim and tire, because of something stuck in-between. Note that it is possible that the leak is in the rim as occasionally rims will have tiny, pinhole flaws due to manufacturing defect.

If you still can't find it you could have it looked at at a local tire shop. They'll probably pull it off and dunk it in water to find the leak.

I did have Tesla look at it when it was at the service center for another issue back in January and they said they didn’t find anything wrong with the tire. I’m a little skeptical and think they probably aren’t really tire experts so who knows.
 

SammichLover

Banned
Dec 8, 2018
2,618
1,542
Yup
I did have Tesla look at it when it was at the service center for another issue back in January and they said they didn’t find anything wrong with the tire. I’m a little skeptical and think they probably aren’t really tire experts so who knows.
Well probably not a obvious foreign object puncture then, which is good. Those are the ones that tend to more readily work a bigger leak over time.

It is a really slow leak of some sort. If they didn't pull it off and fully immerse it good chance they just missed it. I don't know about standard SC procedures in that matter. You might have to just wait for the leak to get a little faster....or if it doesn't, the tires to wear out and replaced. If it stays through a tire change then it'll likely be a rim pinhole defect, or a value stem issue.
 
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Reactions: ChrisH

SammichLover

Banned
Dec 8, 2018
2,618
1,542
Yup
So my whole drive home today all pressures at 48. It must have read a sensor from the tires I have in the car.
This is my fear for carrying a set of tires to AX or the track that I have installed a TPMS into. Currently I went sans TPMS and I'm torn about whether I want to change that during the next tire replacement of my dedicated track wheels.
 

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