Tire psi

[jgaudet99]

I'm looking to see if anyone has any idea's, I put a set of 35x12.5x20 Toyo tires on my 2026 GMC Sierra 2500hd diesel, I contacted Toyo and asked their recommend psi for these tires on my exact truck, so I have 55 psi in the front and 45 psi in the rear that's the recommended psi for me while im not towing!

Problem is now my psi warning light is on! Does anyone know of anything at all that will let me change the set psi values? 

[ArrowsmithPML]

Those psi values are too low for a 10 ply tire. Simple really.

 

 

[jgaudet99]

Why would Toyo give me recommendations for my truck/tire combo so they won't wear uneven then?

[silveradosid]

because they expect you to rotate them 

[jgaudet99]

Well funny thing is... I do rotate them! 

I would think everyone would or should rotate tires, just another basic vehicle maintenance, just like checking and changing your oil.

[PBNB]

I run 60 front and 65 rear. A few pounds lower will trigger the TPMS warning. I have 295/70R18 Falkens AT4W so not quite as large as the 35's

 

I have about 400 lbs attached to the truck bed which helps the ride.

 

Then when you rotate them (if you do it yourself) you can adjust the pressure and will need to use the relearn process so the sensors know which corner they are on. My '23 wouldn't automatically switch the locations so I had the warning all the time until I got the little TPMS tool and sorted that out.

[Atlas]

The answer you're looking for is the TPMS threshold can only be reprogrammed through an MDI 2 interface with the truck using an advanced scan tool, or, at the dealer.

 

We deal with this all the time in the Jeep world when people upgrade tires and wheels, but, there are cheap aftermarket solutions so we can lower the TPMS threshold ourselves. I don't think one exists yet for the newer GM trucks.

[jgaudet99]

9 minutes ago, Atlas said:

The answer you're looking for is the TPMS threshold can only be reprogrammed through an MDI 2 interface with the truck using an advanced scan tool, or, at the dealer.

 

We deal with this all the time in the Jeep world when people upgrade tires and wheels, but, there are cheap aftermarket solutions so we can lower the TPMS threshold ourselves. I don't think one exists yet for the newer GM trucks.

Alright, thank you! 

I reached out to one GM dealer and they say they weren't able to do it, probably don't want to!

but I might ask another one, and If they won't do it, I did a little bit of research and I think the Autel Makisys Elite II Pro scanner will work, it's just expensive! 

Edited yesterday at 02:53 PM by jgaudet99

[newdude]

14 hours ago, jgaudet99 said:

I'm looking to see if anyone has any idea's, I put a set of 35x12.5x20 Toyo tires on my 2026 GMC Sierra 2500hd diesel, I contacted Toyo and asked their recommend psi for these tires on my exact truck, so I have 55 psi in the front and 45 psi in the rear that's the recommended psi for me while im not towing!

Problem is now my psi warning light is on! Does anyone know of anything at all that will let me change the set psi values? 

 

 

14 hours ago, jgaudet99 said:

Why would Toyo give me recommendations for my truck/tire combo so they won't wear uneven then?

 

6 minutes ago, jgaudet99 said:

Alright, thank you! 

I reached out to one GM dealer and they say they weren't able to do it, probably don't want to!

but I might ask another one, and If they won't do it, I did a little bit of research and I think the Autel Makisys Elite II Pro scanner will work, it's just expensive! 

 

 

 

Open the driver's door jamb.  What do the cold tire PSI ratings on the tire placard show?

 

I'm not saying to run it to those numbers, but I would like to know what it says.  

 

 

Edited yesterday at 02:55 PM by newdude

[jgaudet99]

4 minutes ago, newdude said:

 

 

 

 

 

Open the driver's door jamb.  What do the cold tire PSI ratings on the tire placard show?

 

I'm not saying to run it to those numbers, but I would like to know what it says.  

 

 

60psi front and 80psi rear

But I am not running the factory tire brand or size!

it's load range F Toyo tires

[jgaudet99]

Here is an image of a quick Google search about these tires on my truck and it's exactly same psi recommendation the Toyo tires company gave me! 

 

I'm not looking for anyone else recommended psi or anything, I'm just looking to see if anyone knew a way to get rid of the factory low psi warning light, because I'm not running high psi and ruining my tires when I'm not towing! 

[Chuck FB]

46 minutes ago, jgaudet99 said:

Alright, thank you! 

I reached out to one GM dealer and they say they weren't able to do it, probably don't want to!

but I might ask another one, and If they won't do it, I did a little bit of research and I think the Autel Makisys Elite II Pro scanner will work, it's just expensive! 

 

I had a similar but different response when I talked to the service manager where I bought my truck in that he said GM corporate won't allow them to lower the placard pressure setting as they would get their hand slapped but that of course they have the ability to make that change. His suggestion was simply go to a tire dealer or third party shop that is willing to reset the pressures lower. However I chose to buy a tpms tool and partly based off of this very forum as it had been proven to work on the 2024 model ( Global B system ) and while I could have paid lots for a full two way diag tool, I didn't want to spend that much and bought the recommended Autel TS 508 and it will reprogram the 2025 model and assume it should do the 2026 as well. However the tool is rather proprietary to reprogramming Autel tpms sensors so that is a function I will never use, where as a real two way scanner would have many uses but also have yearly subscriptions etc where this 508 is free updates for as long as they put updates out for the unit. In any event it worked to lower the placard pressures and I often use it to adjust my actual tire pressures although will check with a mechanical gauge as well sometimes just to make sure that tires tpms sensor isn't lying to me. 

 

My suggestion is either buy a tool that you know will work to adjust the system or start out by getting the tire shop you bought your tires from to reset your truck and if after that you still want a unit to do it yourself, get one at that point. 

[jgaudet99]

2 minutes ago, Chuck FB said:

 

I had a similar but different response when I talked to the service manager where I bought my truck in that he said GM corporate won't allow them to lower the placard pressure setting as they would get their hand slapped but that of course they have the ability to make that change. His suggestion was simply go to a tire dealer or third party shop that is willing to reset the pressures lower. However I chose to buy a tpms tool and partly based off of this very forum as it had been proven to work on the 2024 model ( Global B system ) and while I could have paid lots for a full two way diag tool, I didn't want to spend that much and bought the recommended Autel TS 508 and it will reprogram the 2025 model and assume it should do the 2026 as well. However the tool is rather proprietary to reprogramming Autel tpms sensors so that is a function I will never use, where as a real two way scanner would have many uses but also have yearly subscriptions etc where this 508 is free updates for as long as they put updates out for the unit. In any event it worked to lower the placard pressures and I often use it to adjust my actual tire pressures although will check with a mechanical gauge as well sometimes just to make sure that tires tpms sensor isn't lying to me. 

 

My suggestion is either buy a tool that you know will work to adjust the system or start out by getting the tire shop you bought your tires from to reset your truck and if after that you still want a unit to do it yourself, get one at that point. 

Thank you, I'll check that Autel scanner out and see if it will work for me!

Ya I can see GM's point of view if they lower the psi set value for someone and the person sell's the truck and the new owner puts the factory tires back on then their could be liability issues cause the psi warning light wasn't coming on when the tires were under inflated for towing their load and then it might be able to be traced back to GM lowering it.

[Chuck FB]

2 minutes ago, jgaudet99 said:

Thank you, I'll check that Autel scanner out and see if it will work for me!

Ya I can see GM's point of view if they lower the psi set value for someone and the person sell's the truck and the new owner puts the factory tires back on then their could be liability issues cause the psi warning light wasn't coming on when the tires were under inflated for towing their load and then it might be able to be traced back to GM lowering it.

 

Yes exactly, more and more these days people/companies are afraid of liability issues so its easier just to say no rather than risk putting their neck on the line. 

 

I will say with the Autel unit or when I used it last year on my truck, it wasn't like I could choose the 2025 model year or even the 2024 model year as that option was not there to manipulate the placard pressures but had to go back to 2023 or there abouts and then it showed up as an option, odd but that was how the software was then and I can't say one way or the other now as they throw out updates every so often. I still would talk to your tire dealer though to start with and they may do it for nothing but also they may have a comment on a better unit to purchase. All I know is that one of the large tire shops in my area happens to use these Autel units for their use and set them up to use the wifi and all of that jazz for constant updating because each tire tech has one handed to them by the shop but I just plugged it into my laptop to update it and yes if one is bought it has to be registered so you can get the link to do updates and then the unit has to be updated before its even used. I am not at all techy so it took me a bit but anyway just a heads up for anything you buy, most likely it will need to be connected to a computer to access the internet to have it updated to the latest software version before you can put it to use.

 

If your truck is near empty, those tire pressures you listed are a very safe upper range pressures to carry the weight, both the front and rear as I know they could be run lower yet with an empty truck. And if its a trailer and not some motorcycle your going to strap onto the front of your truck on a rack, you shouldn't have a need to inflate your front tires if your at 55 front already, its the rear ones that would need more air if you have much hitch weight. 

[jgaudet99]

29 minutes ago, Chuck FB said:

 

Yes exactly, more and more these days people/companies are afraid of liability issues so its easier just to say no rather than risk putting their neck on the line. 

 

I will say with the Autel unit or when I used it last year on my truck, it wasn't like I could choose the 2025 model year or even the 2024 model year as that option was not there to manipulate the placard pressures but had to go back to 2023 or there abouts and then it showed up as an option, odd but that was how the software was then and I can't say one way or the other now as they throw out updates every so often. I still would talk to your tire dealer though to start with and they may do it for nothing but also they may have a comment on a better unit to purchase. All I know is that one of the large tire shops in my area happens to use these Autel units for their use and set them up to use the wifi and all of that jazz for constant updating because each tire tech has one handed to them by the shop but I just plugged it into my laptop to update it and yes if one is bought it has to be registered so you can get the link to do updates and then the unit has to be updated before its even used. I am not at all techy so it took me a bit but anyway just a heads up for anything you buy, most likely it will need to be connected to a computer to access the internet to have it updated to the latest software version before you can put it to use.

 

If your truck is near empty, those tire pressures you listed are a very safe upper range pressures to carry the weight, both the front and rear as I know they could be run lower yet with an empty truck. And if its a trailer and not some motorcycle your going to strap onto the front of your truck on a rack, you shouldn't have a need to inflate your front tires if your at 55 front already, its the rear ones that would need more air if you have much hitch weight. 

Thanks for all that information, I might purchase one and see if it will work for me, if not they may let me return it!

Yes for sure the tires are definitely within limit for my truck empty, and when I do tow I'll definitely make sure to raise the rear psi for the amount of weight that's going to be on it.