Tire Pressure Monitoring System

vranasaurus · January 22, 2008

I recently bought a NBS 2007 2500HD CCSB 4X4 6.0L. I found this site while researching the HD trucks. This site is an immense resource.

I have the stock 245/75/16 tires(whoever decided on this size needs to have his head examined). I was wondering if there is anyway to adjust the TPMS so that it doesn't require 80 PSI in the rears, to turn off the low tire pressure warning, when not hauling a load. I do relatively little towing and even when I do it is a 2000-3500# boat. This does not require 80 PSI I would like to set it at 60 PSI.

When the stock tires wear out I am putting some 265's on it which will require different pressures than the 245's and would probably need to adjust it again.

lazer · January 22, 2008

I posted a similar question here when I got my 08. The dealer can recaculate the monitors. I called my dealer and I think he said they can reset them to about 50 pounds. Maybe more than that. I haven't had it done yet buy I am going to have it done when i get that first oil change.

Zembonez · January 23, 2008

Nice truck for sure but the tires are tiny. I don't think I could last until they wore out. I'd have to put a much bigger set on and sell the old ones!

vranasaurus · January 23, 2008

Nice truck for sure but the tires are tiny. I don't think I could last until they wore out. I'd have to put a much bigger set on and sell the old ones!

I would love nothing more than to get a bigger set of tires. But I can't really justify it especially given that tires that are on it are brand new and fully functional.

Does anyone know the reason for such small tires?

sonjaab · January 23, 2008

WHY? Most likely at the time GM bid out the 2500s tires these were the ONLY LT245-16s being made.

So I can assume they in a long term contract to buy them CHEAPLY!

Nowadays many other tire mfrs. offer larger sizes in the LT tires.

Remember these donuts are not Passenger tires which are run at lower pressures.

Use caution if/when you are buying larger size tires for your truck and are not

buying passenger car tires instead of heavier duty rated LIGHT TRUCK tires.

Of course if you have a 2500/3500 for use as a showoff driveway queen for taking the

kids to school or picking up bags of mulch at the garden store then any passenger car

tire and a set of clown wheels aka dubs, jordans, twennyfoos, etc. will fit the bill nicely!

On the other hand if you have a 2500/3500 and use that bad boy to tow a big camper,

boat, your race car toys and gear, tote tons of gear and material to and from the job

site, snowplow etc. and on occasion drag a blundra or other rice grinder around any parking

lot to impress your friends then you must have a LT rated tire !!!!!!!!!!!!!!!!!

.........geo

deerhunter · January 23, 2008

My dealer is reluctant, to the point of refusing, to reset the TPMS on my rig. I may have to push it with him. The TPMS wants 72 PSI in the rear. I am getting away with 60 PSI without having the warning light turn on on the dash, but OnStar flagged "low tire pressure" in an email they sent me.

I just had a chance to put the rig on a scale -- the rear weighted 2,500 lbs with no passengers and over a half tank of gas. That kind of weight should not require any more than 50 PSI in order to have a decent footprint on the pavement, not to mention not wearing out the center of the tread.

The dealer had a brochure that seemed to say that it is illegal to reset the TPMS to other than factory specs. Has anyone else run into that one?

sonjaab · January 23, 2008

Dealers are getting gunshy about modifying ANYTHING from the way it came from

the factory !!!!!!!!!!! Why??????????

LIABILITY !!!!!

hECK.............How many posts do ya see on these forums from folks getting the

"NO WAY!" from the dealer about changing the programming for larger tires,

crankshaft position sensor relearn (when installing a custom burned PCM)

or playing dumb when guys want to do the DIC or foglight install

and other mods with the Tech 2 ?...............LOTS!!!!!!!!!

Go to another dealer ! Some will, some won't!...................geo

redvett · January 23, 2008

Tire size has nothing to do with a contract, it does however have to do with fuel economy & power. When you go from 245's to 265's will change your effective gear ratio and your towing capacity lower. You also will not be in the sweet spot your engine requires to get the best fuel economy, power. ride & handling.

vranasaurus · January 23, 2008

WHY? Most likely at the time GM bid out the 2500s tires these were the ONLY LT245-16s being made.
So I can assume they in a long term contract to buy them CHEAPLY!

Nowadays many other tire mfrs. offer larger sizes in the LT tires.

Remember these donuts are not Passenger tires which are run at lower pressures.

Use caution if/when you are buying larger size tires for your truck and are not

buying passenger car tires instead of heavier duty rated LIGHT TRUCK tires.

Of course if you have a 2500/3500 for use as a showoff driveway queen for taking the

kids to school or picking up bags of mulch at the garden store then any passenger car

tire and a set of clown wheels aka dubs, jordans, twennyfoos, etc. will fit the bill nicely!

On the other hand if you have a 2500/3500 and use that bad boy to tow a big camper,

boat, your race car toys and gear, tote tons of gear and material to and from the job

site, snowplow etc. and on occasion drag a blundra or other rice grinder around any parking

lot to impress your friends then you must have a LT rated tire !!!!!!!!!!!!!!!!!

.........geo

Years ago I used to sell tires for Sears, I understand completely the difference betwenn LT and P tires.

I had about 2 or 3 very angry customers because we wouldn't put the cheaper Passenger tires on their heavy duty trucks. They wondered why we were "making" them buy the more expensive tires.

And it was all about liability. We were not allowed to put a tire on a care of a lower load range than what came from the factory.

Even though I do not forsee any heavy towing I will keep the LT tires on it just in case I need to. No guady rims for me.

ABQFirefighter · January 26, 2008

I installed 285/75's on my truck. Of course with the 65psi max, the TPMS alert was consatantly flashing. I went to the dealer and asked them about resetting it to the new tire specs. They charged me $80 (1-hour labor for a 20 min. job.), no big deal. He said that they wouldn't touch the TPMS numbers for the stock 245's, but some dealers do. The tech told me to pick the front and rear numbers as the TPMS allows 5-10 psi in either direction before the alert will go on. I chose 50 in the front and 45 for the rear. Now, whenever I have to go in the sand or tow my 5'er, the alert will definitely go on, but it is such a small percentage of the actual driving time I do that it's no big deal.

deerhunter · January 26, 2008

With all the new vehicles required to have TPMS, I can forsee some enterprising outfit manufacturing and selling aftermarket equipment for adjusting the TPMS. At $80 a pop to have it reset by the dealer, it would not take long to pay for an aftermarket tool.

It's a brave new world, isn't it?