Jump to content

TPM Reflash

Mark57

By Mark57
in Modifications & Accessories

 Share

Recommended Posts

Mark57 Enthusiast

Mark57

Posted
Posted

I've read threads of where people talk about getting there PCM reflashed for the lower values. I have a 2026 3500 dually and my aftermarket tires and wheels ride the best with 40PSI I ask the dealer they said that it would void my warranty, not sure if that's true. Thanks Mark 

Chuck FB Enthusiast

Chuck FB

Posted
Posted
On 12/17/2025 at 4:15 PM, Mark57 said:

I've read threads of where people talk about getting there PCM reflashed for the lower values. I have a 2026 3500 dually and my aftermarket tires and wheels ride the best with 40PSI I ask the dealer they said that it would void my warranty, not sure if that's true. Thanks Mark 

 

That is a good question, at the time of purchasing my truck I had talked to the service manager who used to be a mechanic, to see if they were willing to lower my factory placard set tpms pressures and he said while we are capable of physically doing it, no they were not allowed to as a GM dealer as they would get their hands slapped by corporate GM ( that was his way of putting it ) but did not happen to mention anything about warranty one way or the other so I have no idea about that part. He said my best bet would be to go to a tire shop or independent mechanics shop and have them do it. I ended up buying an Autel tpms tool and did it myself and not saying that is the ideal tool as its geared towards Autel sensors more than other sensor brands, it did the trick in lowering the pressures before the system triggers the dash to say I am under pressure. 

 

So I don't really have the answer to your question, GM seems pretty finicky up here in Canada with warranty because they know they can screw over the customer if they can see an out due to our lack of consumer laws like the USA has. 

carkhz316 Enthusiast

carkhz316

Posted
Posted

Go to any competent independent shop and they can do it for you. Any modern scan tool that has bi-directional controls/ special tests functions, has been able to adjust the "low tire pressure threshold" setting in GM vehicles. This is assuming that GM hasn't suddenly locked out that ability as they have done with other things in the past.

  • 2 weeks later...
Mark57 Enthusiast

Mark57

Posted
  • Author
Posted

So I read that you can go on the information screen and put in off road app and i guess choose air down tires, first I have heard of this with all the threads I've read.  Mark

Mark57 Enthusiast

Mark57

Posted
  • Author
Posted

Right? I think it's just the fact that GM is freaking out about people going into the PCM to alter any values that they see fit? Mark

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Aimatdeer
      Ac not keeping up

      By Aimatdeer · Posted

      Anyone have any info about backorder time? It's classic 4th of July hot here in ohio.
    • Chuck FB
      Fluid Change Questions

      By Chuck FB · Posted

      There would be one way of determining the quality of the factory oil although probably more than a typical oil lab test, and that would be to draw out some oil from a new truck and send a sample to a lab that could do a more elaborate test of the oil. The issue with too little oil in the diff may not be the lack of lubrication of the diff bearings and gears themselves ( although a lack of oil volume for cooling ) but the wheel bearings because at some point the oil would be too low to properly get onto the spinning axle or fed along the axle tube. That was the claim by the local dealer from a couple of trucks in recent years that had the wheel bearings fail and they figured from lack of sufficient oil due to a severe underfilled diff and some of the bearing material made its way to the diff and it got damaged as well so the axle housings were just replaced on warranty. But your right that if the diff is over filled by whatever margin that it causes more churning of the oil than is desirable and that is no good either and can cause a pinion seal to leak. Also old oil I believe can tend to loose some of its properties like antifoaming and another good reason to change the diff oil every so often. 
    • Z45
      Fluid Change Questions

      By Z45 · Posted

      I would be surprised if the diff's were not filled (with the cheapest gear lube) at the axle factory before being shipped to GM.  If you ever watched them building trucks they install the axles and all suspension parts with the frame upside down and then turn it over before its time to install the engine.     Too much gear lube in a axle can be worse than not enough especially with a lower quality GL where is get whipped up with entrained air (foam)  weakening its ability to lubricate.        
    • MORSNO
      Oil Consumption

      By MORSNO · Posted

      This is the 6.6 gasser section of the forum, you should either delete or modify your previous post as it is misleading for anyone looking for factual information on their 6.6 gas engine.
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Well....I've done my first intake gasket. Probably wrong, but...we'll see?   Ultra black on the china walls and 1/4" up onto the sides of the intake gaskets. Permatex High Tack (couldn't find Gaskachinch) on the head side of the intake gasket. I read wrong and it says you're supposed to put it on the mating surface of the head, not the gasket. Hoping it's like a PB&J sandwich where it doesn't matter what side the PB goes on so long as there's jelly. That crap is messy/sticky and I got a dab or two on the intake port openings, tried to wipe it off. Hopefully it won't be a big deal and will only aid in sealing.   Per instructions I left the intake (top side) of the gasket dry except for a light smear of RTV around the coolant ports. Wiggling the intake in there was a bear but I had help to free me of surrounding wiring/stuff but I was basically able to set it straight down lined up with the bolt holes.   I did not think to wait until the RTV skinned over but there probably was 5-10 minutes while it sat before installing the intake.   Bolts finger tight first. Then, followed the Chilton's manual pattern to snug them to 15 lb-ft.   Waited a little over an hour, and then did the final torque in sequence again to 35 lb-ft.   Yesterday I replaced the fuel pressure regulator and got my new "nut and bolt kit" (fuel lines) installed. Damn GM used security torx on the spider, which I don't have, so I got scammed at the local HW store for an off-brand security Torx bit set.   The new driver's door mirror arrived yesterday, so, there's a chance this thing could be running and road legal tomorrow? I don't want to get my hopes up.   This will be my first time stabbing a distributor, too. Although, lucky me, someone else marked the old distributor for removal previously, I did see that. (Someone's been here before!!). Engine is still at TDC so it *should* be just a matter of transferring the mark to the new dizzy and rotating it into place.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...