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TPMS or Tire trouble?

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Old Jun 16, 2012 | 12:50 PM
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Default TPMS or Tire trouble?

I got my c6 zo6 repos put on yesterday. With new BFG 295/35/18 tires on the back and since the front tires were in good shape i got them put on the new sets of wheels 275/40/17. One of my tpms were bad on the front right and it had been that way since i bought the car so when i got the new wheels I just didnt put the front sensors on the wheels. Now when I crank my car it says "Front left tire flat" "Maxim speed 55 mph" "reduced handling" If i drove over 60 it is really hard to control and it feels like the rear end keeps swaying back and forth and I dont have much control over the car. Is not putting tps on the front causing this or is it something to do with not having the right size tire on the front?
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Old Jun 16, 2012 | 12:58 PM
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My "guess" is that it's the size of the tire.
My tire pressure sensors in my 02 haven't worked in a long time and I've never seen that message.
Good choice of the rear tires, I recently purchased those exact same tires for my 98.
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Old Jun 16, 2012 | 01:03 PM
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25.7 front / 26.1 rear, your front tire is way to tall.
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Old Jun 16, 2012 | 01:04 PM
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I have never seen reduced speed with a bad sensor, You might check the plug that goes to each hub and make sure they have a good conection, Having a bad sensor will not cause the issue you have, You might also try to see if you are getting any codes, If your car is going into reduced speed I would think you will have a code.
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Old Jun 16, 2012 | 01:05 PM
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Originally Posted by Bill Vett
25.7 front / 26.1 rear, your front tire is way to tall.
Good point, I believe you need 1/2 inch difference between the front and rear.
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Old Jun 16, 2012 | 01:06 PM
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Originally Posted by Bill Vett
25.7 front / 26.1 rear, your front tire is way to tall.
What is the correct tire size that I should use for the front? 17-9.5
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Old Jun 16, 2012 | 01:17 PM
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265/40/17 is 25.4 I think that will work. the reduced speed could be what the post above mentioned.

Last edited by Bill Vett; Jun 16, 2012 at 01:24 PM.
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Old Jun 16, 2012 | 01:24 PM
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Originally Posted by 8VETTE7
Apparently neither of you have read the owners manual. The message received is because the TPMS thinks the tire is FLAT. It DEFINITELY is related to TPMS.

If you don't have an owners manual you can download a free one at

www.gmpartshouse.com
I have never had a flat, I have ran my car with a bad sensor before with no issues, I didn't know the car would go into reduced power mode because of a flat, New to me. Thanks for your knowledge, I now now more than I thought I did.
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Old Jun 16, 2012 | 01:25 PM
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The size of the tire has nothing to do with the pressure in the tire. The computer is looking for a pressure signal; That's all. There are no sensors that check for tire height. People put different size rims and tires on all the time. If you have no sensors up front, the computer doesn't think there is any pressure in the tires. I would put some sensors in. They obviously were working somewhat if you had them and no trouble messages, and got rid of them and now have trouble messages.
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Old Jun 16, 2012 | 01:31 PM
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Originally Posted by NukeC5
The size of the tire has nothing to do with the pressure in the tire. The computer is looking for a pressure signal; That's all. There are no sensors that check for tire height. People put different size rims and tires on all the time. If you have no sensors up front, the computer doesn't think there is any pressure in the tires. I would put some sensors in. They obviously were working somewhat if you had them and no trouble messages, and got rid of them and now have trouble messages.
You are way off here, Each hub has a sensor which does check the speed of the tires front and rear, If your tires are not 1/2 inch or a bit more between the front and rear your car will go into reduced power mode, AH/TC will not get a good speed reading if the tires are not in spec. Also he may have 2 issues here, The tire size and the TPMS. Just a thought.

Last edited by Mr.Bill; Jun 16, 2012 at 01:33 PM.
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Old Jun 16, 2012 | 01:43 PM
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Originally Posted by Mr.Bill
You are way off here, Each hub has a sensor which does check the speed of the tires front and rear, If your tires are not 1/2 inch or a bit more between the front and rear your car will go into reduced power mode, AH/TC will not get a good speed reading if the tires are not in spec. Also he may have 2 issues here, The tire size and the TPMS. Just a thought.
Is that on later models? I only have an ABS wire leading to my fronts. Where is the other sensor? I apologize if I am wrong. I've just never heard of that.
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Old Jun 16, 2012 | 02:40 PM
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Originally Posted by 8VETTE7
Apparently neither of you have read the owners manual. The message received is because the TPMS thinks the tire is FLAT. It DEFINITELY is related to TPMS.
Like I said in post #2, I haven't had working TPMS in my 02 for many years and I've never seen the message the OP has.


Each hub has a sensor which does check the speed of the tires front and rear, If your tires are not 1/2 inch or a bit more between the front and rear your car will go into reduced power mode

I do not know that as a fact but I have heard (or read) that before.
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Old Jun 16, 2012 | 02:54 PM
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Ahh, it all makes more sense now.
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Old Jun 16, 2012 | 02:55 PM
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Originally Posted by Mr.Bill
You are way off here, Each hub has a sensor which does check the speed of the tires front and rear, If your tires are not 1/2 inch or a bit more between the front and rear your car will go into reduced power mode, AH/TC will not get a good speed reading if the tires are not in spec. Also he may have 2 issues here, The tire size and the TPMS. Just a thought.
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Old Jun 16, 2012 | 03:25 PM
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Originally Posted by Jeff in Den
Once again you hop on the band wagon with no information or any experience or anything helpful to say.

You have no idea what your talking about. Just agreeing because you are upset at me from another thread and looking to lash out at me. Grow up bud. Have a nice day
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Old Jun 16, 2012 | 04:35 PM
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Originally Posted by Bill Vett
25.7 front / 26.1 rear, your front tire is way to tall.
I agree. The car came with a 1" stagger front to rear and you are way below that.
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Old Jun 16, 2012 | 05:03 PM
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And on the other hand I have 275/40x17 fronts with 295/35x18 rears and no sensors at all. No issues other than the XXXXX readings from the sensors.

Whether or not you can get by with those sizes may depend on how the tire manufacturer actually sizes the tires.

Are the tires the same manufacturer front and rear?
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Old Jun 16, 2012 | 07:14 PM
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Originally Posted by 04WHITEC5
I got my c6 zo6 repos put on yesterday. With new BFG 295/35/18 tires on the back and since the front tires were in good shape i got them put on the new sets of wheels 275/40/17. One of my tpms were bad on the front right and it had been that way since i bought the car so when i got the new wheels I just didnt put the front sensors on the wheels. Now when I crank my car it says "Front left tire flat" "Maxim speed 55 mph" "reduced handling" If i drove over 60 it is really hard to control and it feels like the rear end keeps swaying back and forth and I dont have much control over the car. Is not putting tps on the front causing this or is it something to do with not having the right size tire on the front?
When I rebuilt my sensors and had my new tires put on, one didn't read pressure and my car went into reduced power also. If the computer thinks you have a flat it will try and keep your speed below 55 mph.
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Old Jun 17, 2012 | 12:15 AM
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Originally Posted by NukeC5
Once again you hop on the band wagon with no information or any experience or anything helpful to say.

You have no idea what your talking about. Just agreeing because you are upset at me from another thread and looking to lash out at me. Grow up bud. Have a nice day
You're right, the experience Mr. Bill described and I agreed with wasn't mine, but my Discount Tire guy shared pretty much the same story about his C5.

As to being upset and lashing out.....? Over something said on an internet forum? Wow...
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Old Jun 17, 2012 | 04:32 AM
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Well from the feedback I've gotten I'm guessing the tires and the sensors are both causing the problem. So could anyone tell me the right size tire I should be running in the front? And where to get a sensor besides the dealership and know which one is the right one to get.
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