10-25-2009, 12:42 PM | #1 |
Drives: SUMMIT WHITE 2SS/RS CAMARO Join Date: Feb 2008
Location: 2018: Lakewood Ranch, Fl.
Posts: 8,134
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OnStar Diagnostics Report- TIRES.
Today I received an OnStar computerized diagnostic report via Emailed with green, yellow, red boxes along with a short note on each mechanical catagory. All is Ok but it says all 4 tires are at 30 PSi instead of 36 PSI.
I'm wondering if this could be a computer glitch or due to the colder weather now hitting New England. It's in the 30's here now in the early A.M.'s. I guess I'll have to go check my tire pressure but @ 1700 miles it seems odd all 4 tires would be down exactly 6 pounds on my 2SS. |
10-25-2009, 12:50 PM | #2 |
Camaro SL,UTs
Drives: 2010 Camaro SS/RS #16429 Join Date: Sep 2006
Location: South Jordan, UT
Posts: 7,358
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It's the cold weather. I'm in Utah and its getting around 36 degrees here over night and I'm getting reports that my tires are around 30-31psi as well.
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10-25-2009, 12:57 PM | #3 |
I used to be Dragoneye...
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The DIC should tell you the tire pressures, too...right?
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10-25-2009, 12:58 PM | #4 |
Drives: 1987 IROC Z convertible Join Date: Aug 2009
Location: Ohio
Posts: 103
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I put 35psi in mine but my car only shows 31. Is there a way to calibrate the sensors?
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10-25-2009, 01:26 PM | #5 |
Emerald Coast Camaros
Drives: 2010 2SS Rally Yellow Join Date: Feb 2009
Location: TALLAHASSEE,FL
Posts: 4,254
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I think it's messed up myself. I had all mine done at 36 and the computer said 40, 41 and 38,39. On star is never the same. Sp, I don't know what to believe.
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10-25-2009, 03:44 PM | #6 | |
Drives: 2016 Mosaic Black 2SS Join Date: Oct 2009
Location: Illinois
Posts: 21
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Quote:
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10-25-2009, 03:54 PM | #7 |
NOICE!!! ™
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Same here my report says they are low but when I check tire gauge there fine,
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10-25-2009, 03:56 PM | #8 |
Get a good tire pressure gauge, use it,and trust your instincts. Kinda of old fashioned but has proven successful for alot years!
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10-25-2009, 06:12 PM | #9 | |
Account Suspended
Drives: 89 IROC 350 Join Date: Mar 2009
Location: Back roads, southern Ohio
Posts: 12,504
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It does.
Quote:
Mine does it all the time. Don't worry about it and don't over inflate them. if it is cold out and the car has not been driven, the air compresses and the pressure is low. As you drive, the tires heat up, the air expands and the warning goes away. if you get the warning and fill them up in the cold, the tires will warm up, the air will expand and you will be over inflated. Best advise... on a decent day in the 60s, drive the car around a while doing osme turning to heat the fronts up too and go fill them where you want them using a pressure guage and then ignore onstar. If the warning comes on in the DIC, take a quick check to make sure you are only a few pounds off and go on your way. It is a good idea to check incase you actually do have a leak. If it reads 20psi.. you have a problem. Expansion/contraction only changes them a few pounds and if you run low 30s you will get the warning alot. Second way to eliminate it is go and have them filled with nitrogen. Expansion/contraction is much less. |
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10-25-2009, 06:33 PM | #10 |
Camaro & Stang Enthusiast
Drives: 2011 Mustang 5.0 in Kona Blue Join Date: Mar 2008
Location: Miami
Posts: 4,752
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Don't listen to Onstar or the tire gauge in the car.. It is rarely accurate. Buy yourself a digital tire pressure gauge and once a week check them. I also bought an inflater and every week it is down from 36 to 35/34 when cold. That is in 75 F weather in the morning. The moment you start driving around, the tire pressure goes up and down depending on how you drive. Always check the pressure when it is cold and in the morning to be consistent.
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Bought my Camaro from Eric Hall(817) 421-7266
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10-25-2009, 07:48 PM | #11 |
Institutionally Insane
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If you have pressures set at 36 cold and it is 70 degrees out, the pressures will drop 5-6 psi at 30 degrees.
Always fill tires when it will be coldest out..both ambient and tire temp. A digital gauge should be used regardless what the DIC states. Same holds true from winter to spring...You have 36 PSI and a 70 degree day hits. Your cold pressures will be 42 psi.
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It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspension, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas. What do you say, is it the new Bluesmobile or what?
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10-25-2009, 07:51 PM | #12 |
I used to be Dragoneye...
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I'd like to disagree with this...My experiences with the system have always been within 1 psi of the actual pressure.
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10-25-2009, 07:58 PM | #13 |
Drives: 2016 & 1967 Camaro, 2015 Impala, +1 Join Date: Jul 2009
Location: New York
Posts: 1,165
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11-04-2009, 11:02 AM | #14 |
Drives: 1LT; IBM; 6 Spd Manual Join Date: May 2009
Location: Heath, Tx.
Posts: 499
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Reset your tire pressure sensing at the switch on the steering wheel. I had a tire indicate low pressure - warning from car sesning system illuminated. I reset the pressures and all was fine. Pressures were a tad higher than before reset. Like any monitor system I suppose it can get corrupted or misinform. Just reset and see what you get.
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