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Old 10-11-2017, 05:29 PM   #21
Foosh
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Agreed, given the numbers Zymurgy published above, the lower end of the warm range is actually cold, at least as far as the OEM PSS summer tires are concerned.
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Old 10-11-2017, 05:31 PM   #22
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Quote:
Originally Posted by Foosh View Post
Zymurgy/Tex/Jerry

Yes, I was just wondering how the poster quoted above was seeing this in his car.
I'm going to guess he is confusing the air pressure readout for temperatures.

Last edited by drs; 10-11-2017 at 05:31 PM. Reason: grammar
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Old 10-11-2017, 05:33 PM   #23
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Quote:
Originally Posted by Avanti View Post
Another virtually worthless datum I won't need to worry about.
You need to worry about it when the idiot (plenty of them) with cup2s on a 50 degree day thinks he has warm tires & is in oncoming traffic....
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Old 10-11-2017, 06:01 PM   #24
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Damned right. There was thread published about a week ago at a track outing showing a white C7 that piled into a tire wall on a cool morning, and I suspect that gauge was showing tires "warm."

Last edited by Foosh; 10-11-2017 at 06:02 PM.
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Old 10-11-2017, 06:07 PM   #25
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Quote:
Originally Posted by DanZR1 View Post
I just got back from a 1700 mile trip through the Rockies. One morning leaving Dillon it was 26 degrees. At start up, tires read Warm. Drove a bit and it never changed. I have seen Hot before, so it's reading something. I too found it odd that they never got Cold.

So it's not just you, Jim...
Thanks, I needed that.
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Old 10-12-2017, 12:32 PM   #26
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Quote:
Originally Posted by Gearhead Jim View Post
With the conditions described in my original post, I can't see how my tires could have been above 46'.
A Z06 in our group also said his tires indicated "Warm" immediately after starting, on another day when the temperature was below 40' after parking outside overnight.

Somethin' strange about the system...
We've already discussed that the system does not actually measure the tire temperature. There are a lot of factors that would affect those temps. The ambient air temperature is only one factor. I imagine the ground is still much warmer than the ambient air temperature was. The tires are sitting on that warm ground getting warmed by it. I'm also guessing that you drove the car prior to parking it and that would have elevated the tire/wheel temperatures. The temperature sensor is inside the TPM sensor which is inside the tire. That a lot of mass to cool off and the air temperature (36) just isn't cold enough to offset the ground heat and existing tire wheel heat. How long was the air temp below 46 degrees? What was the air temp when you parked it? What were the tire temps when you parked it? How hot were your brakes? Just too many variables that we don't know.

I do know that the display does show Cold and others have posted it displaying Frozen.
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Old 10-12-2017, 02:00 PM   #27
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Quote:
Originally Posted by Zymurgy View Post
We've already discussed that the system does not actually measure the tire temperature. There are a lot of factors that would affect those temps. The ambient air temperature is only one factor. I imagine the ground is still much warmer than the ambient air temperature was. The tires are sitting on that warm ground getting warmed by it. I'm also guessing that you drove the car prior to parking it and that would have elevated the tire/wheel temperatures. The temperature sensor is inside the TPM sensor which is inside the tire. That a lot of mass to cool off and the air temperature (36) just isn't cold enough to offset the ground heat and existing tire wheel heat. How long was the air temp below 46 degrees? What was the air temp when you parked it? What were the tire temps when you parked it? How hot were your brakes? Just too many variables that we don't know.

I do know that the display does show Cold and others have posted it displaying Frozen.
The factors you mentioned are all relevant, but...
On our C5 and C6, I would sometimes check the coolant, oil, and transmission temps, immediately after startup from overnight parking in our unheated garage; and then compare them with the two thermometers on the wall inside the garage. All of the temps would be identical within +/- 2'F.

I have a "laser" thermometer, I should compare the tire temps and air temps a few times during the winter and post the results here.
Somebody remind me if I forget to do it.
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Old 10-12-2017, 06:25 PM   #28
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I always keep my display on the 4 wheel PSI. You can tell when your tires are warm, because when cold, the pressure is low. So if you air up to correct pressure when the tires are warm, if the car sits in the cold (below 32 degrees), when you start it the pressure will read low, 28-29 PSI. When the pressure comes up to 30 PSI your tires are warm.

Sly
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Old 10-12-2017, 08:46 PM   #29
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Quote:
Originally Posted by kitesurfer View Post
mine reads the actual temp of all 4 tires. Is it broken?
It reads the tire pressure per tire. Not the temp. As discussed in the other replies.
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Old 11-06-2017, 12:11 PM   #30
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Quote:
Originally Posted by Zymurgy View Post
Temperature readouts:
• Frozen (32 and below)
• Cold (46 .4F to 32)
• Warm (46 .4F to 104F)
• Hot (above 104F)
• Overheated
Quote:
Originally Posted by Gearhead Jim View Post
...
I have a "laser" thermometer, I should compare the tire temps and air temps a few times during the winter and post the results here.
Somebody remind me if I forget to do it.
Here are some readings with the laser thermometer taken in our unheated garage, with the car parked more than 24 hours. I take the temperature on the sidewall of the tire, right next to the TPMS sensor, the four wheels will be within +/- 2'F of each other:

10-26-2017
Tire temperature with laser thermometer 44'
Dash readout: "Warm"

11-06-2017
Tire temperature with laser thermometer 32'
Dash readout: "Warm"

11-08-2017
Tire Temperature with laser thermometer 28'
Car outside temp 34'
Dash readout: "Warm"

11-1--2017
Tire temperature with laser thermometer: 19
Dash readout: "Warm"

Since DanZR1 posted a similar experience, mine may be working as designed.
I wonder if there are different calibrations for the different models of C7 and their different tires? Ours is a 2017 Z51.

Last edited by Gearhead Jim; 11-10-2017 at 12:09 PM.
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Old 11-06-2017, 12:24 PM   #31
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Quote:
Originally Posted by speedlink View Post
It reads the tire pressure per tire. Not the temp. As discussed in the other replies.
No, both temp and pressure are read. See Zymurgy's chart. The problem is "warm" does not mean warm, and as others have demonstrated in this thread, it can actually mean you still have cold tires.
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Old 11-08-2017, 10:45 AM   #32
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I updated post #30 with my latest numbers, and included the outside air temp displayed by the car.
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Old 11-10-2017, 12:13 PM   #33
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Post # 30 just updated again.
I can't see how 19'F qualifies as "Warm" anywhere except in Antarctica.
It's actually below the temperature at which GM tells us not to move the car at all, or the summer tires may crack. I've got AS tires on the car now but neither the sensors nor the car computer knows that.
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Old 11-10-2017, 12:20 PM   #34
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Jim, have you tried driving the car? I wonder if the sensors have to update, like the ambient air temp sensor does? FWIW, it didn't work for me in Dillon, but I had driven a bit before I rechecked, so in they they could have warmed up...
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Old 11-10-2017, 03:40 PM   #35
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Quote:
Originally Posted by DanZR1 View Post
Jim, have you tried driving the car? I wonder if the sensors have to update, like the ambient air temp sensor does? FWIW, it didn't work for me in Dillon, but I had driven a bit before I rechecked, so in they they could have warmed up...
I've wondered about that also, will test and report back some day.
Thanks for asking.
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Old 11-10-2017, 04:40 PM   #36
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Some info here on tire temp categories.

Start video at 4:00

http://www.autoline.tv/daily/?p=29850&cpage=1
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Old 11-10-2017, 06:35 PM   #37
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Quote:
Originally Posted by c54u View Post
Some info here on tire temp categories.

Start video at 4:00

http://www.autoline.tv/daily/?p=29850&cpage=1
A very good explanation, thanks.

But if my ABS/TC/AH think my tires are "Warm" when they are actually 19'F, that could lead to some nasty surprises.
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Old 11-13-2017, 08:34 PM   #38
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Problem Solved!

I noticed that our 2017 had occasional weird electrical glitches- showed me twice as "Driver #3" with no #3 fob, the tire temperature issue, the CTEK charger would sometimes temporarily lose its connection in the rear plug even though firmly plugged in, etc. Just the usual Corvette electrical problems, right? Hmmm...

Two days ago I took a guess and unplugged the Valentine "Savvy" unit from the OBD port. The Savvy powers the detector when the car is running and reads the car speed so it can mute warnings below whatever speed I set. It does not "tell" the car anything, it just "listens".

Voila!
Today I started the car at 37' temp, the tires said "Cold" but transitioned to Warm" after about 6 miles of driving. And the charger has been working properly for these two days.
Now, to find a better detector setup...

Thanks for all your comments.
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Old 11-13-2017, 08:50 PM   #39
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Interesting, but doesn't explain mine reading Warm when I was in Colorado. (Un)fortunately, it seldom gets below 40 here for very long, and never in my garage. If I ever find myself parked overnight somewhere cold, I'll double check...
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Old 11-13-2017, 10:12 PM   #40
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Quote:
Originally Posted by DanZR1 View Post
Interesting, but doesn't explain mine reading Warm when I was in Colorado. (Un)fortunately, it seldom gets below 40 here for very long, and never in my garage. If I ever find myself parked overnight somewhere cold, I'll double check...
You have my deepest sympathy.


Seriously, if yours ever acts up again, please post.

BTW, a local friend had intermittent TPMS problems with his C6 just because of a phone charger plugged in.
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