OnStar Diagnostics Report- TIRES. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

myold88 · 10-25-2009, 12:42 PM

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.

SSOOCH · 10-25-2009, 12:50 PM

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.

*Mr. Wyndham* · 10-25-2009, 12:57 PM

The DIC should tell you the tire pressures, too...right?

lcmc · 10-25-2009, 12:58 PM

I put 35psi in mine but my car only shows 31. Is there a way to calibrate the sensors?

68/2010 · 10-25-2009, 01:26 PM

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.

beegroovie · 10-25-2009, 03:44 PM

Quote:

Originally Posted by myold88

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.

FWIW, all 3 montly OnStar diagnostics that I've gotten since I took deliver all say the tires are low (31psi). The DIC and the tire gauge say they're fine. This happened in warm weather also, so I don't think it has to do with the outside temperature.

Andro · 10-25-2009, 03:54 PM

Same here my report says they are low but when I check tire gauge there fine,

anthonybyram · 10-25-2009, 03:56 PM

Get a good tire pressure gauge, use it,and trust your instincts. Kinda of old fashioned but has proven successful for alot years!

IROCanSS · 10-25-2009, 06:12 PM

Quote:

Originally Posted by Dragoneye

The DIC should tell you the tire pressures, too...right?

It does.

Quote:

Originally Posted by lcmc

I put 35psi in mine but my car only shows 31. Is there a way to calibrate the sensors?

You can. Its in the DIC, it says reset. The horn will beep a few times when you hit it. Very strange.

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.

Supermans · 10-25-2009, 06:33 PM

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.

Banshee · 10-25-2009, 07:48 PM

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.

*Mr. Wyndham* · 10-25-2009, 07:51 PM

Quote:

Originally Posted by Supermans

Don't listen to Onstar or the tire gauge in the car.. It is rarely accurate.

I'd like to disagree with this...My experiences with the system have always been within 1 psi of the actual pressure.

97one · 10-25-2009, 07:58 PM

Quote:

Originally Posted by 68/2010

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.

It varies with the outside temp.
And rises after you drive & they heat up.

calflan · 11-04-2009, 11:02 AM

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.

10-25-2009, 12:42 PM	#1
myold88 Drives: SUMMIT WHITE 2SS/RS CAMARO Join Date: Feb 2008 Location: 2018: Lakewood Ranch, Fl. Posts: 8,112 View My Garage	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
SSOOCH Camaro SL,UTs Drives: 2010 Camaro SS/RS #16429 Join Date: Sep 2006 Location: South Jordan, UT Posts: 7,358 View My Garage	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. __________________

10-25-2009, 12:57 PM	#3
Mr. Wyndham I used to be Dragoneye... Drives: 2018 ZL1 1LE Join Date: Jan 2007 Location: Buffalo, NY Posts: 31,876 View My Garage	The DIC should tell you the tire pressures, too...right? __________________ *"Keep the faith."* - Fbodfather

10-25-2009, 03:54 PM	#7
Andro NOICE!!! ™ Drives: Force Fed 427 Join Date: Jan 2009 Location: GOT BOOST? Posts: 5,214 View My Garage	Same here my report says they are low but when I check tire gauge there fine, __________________

10-25-2009, 06:33 PM	#10
Supermans Camaro & Stang Enthusiast Drives: 2011 Mustang 5.0 in Kona Blue Join Date: Mar 2008 Location: Miami Posts: 4,752 View My Garage	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. __________________ Bought my Camaro from Eric Hall(817) 421-7266

10-25-2009, 12:58 PM	#4
lcmc Drives: 1987 IROC Z convertible Join Date: Aug 2009 Location: Ohio Posts: 103	I put 35psi in mine but my car only shows 31. Is there a way to calibrate the sensors?

10-25-2009, 01:26 PM	#5
68/2010 Emerald Coast Camaros Drives: 2010 2SS Rally Yellow Join Date: Feb 2009 Location: TALLAHASSEE,FL Posts: 4,254 View My Garage	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.

10-25-2009, 03:56 PM	#8
anthonybyram Drives: 1972 Z28, torch red,454 Join Date: Apr 2009 Location: mexico,mo Posts: 562 View My Garage	Get a good tire pressure gauge, use it,and trust your instincts. Kinda of old fashioned but has proven successful for alot years!

10-25-2009, 07:48 PM	#11
Banshee Institutionally Insane Drives: 2013 IOM 2SS/RS 1LE Join Date: Feb 2009 Location: Detroit MI Posts: 2,115 View My Garage	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. __________________ 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?

11-04-2009, 11:02 AM	#14
calflan Drives: 1LT; IBM; 6 Spd Manual Join Date: May 2009 Location: Heath, Tx. Posts: 499	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. __________________ 1LT; Airaid CAI; Flowmaster American Thunder Axelback; Int Floor Lts; RS Spoiler; Radio Controls; Sequential tail lights; Oil Catch Can; VMAX Throttle Body; MACE plenum spacer; Mace manifold insulator[/I]

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