TPMS maxing out at 51psi?

I'm running 34" load range E tires on my 2019 DC, and when prepping for my recent 2000 mile tow I aired up quite a bit... 50psi up front and 60psi in the rear. The TPMS numbers stopped increasing at 51psi and never went higher.
Does anyone know, do I need different sensors to get a higher reading? My duramax would regularly run 65-75psi and give a proper readout.

 

Seems to be a common thing that sensors max out at 50-55 psi. Try reaching out to TPMS.com and see if they can assist.

 

My 19 stops at 50psi. Be happy with 51. Not sure if it is hardware or a techstream limitation that can be adjusted.

 

That is normal for the stock TPMS. I’ve always just checked with a regular air gauge whenever going beyond figuring if I pick up a nail, the TPMS alarm will light up before the tire is flat. I would be interested to see if the link @Tundra234 has a solution.

 

My question is what are you towing? Keep in mind that just because the LRE tire is rated to 80# doesn’t mean you have enough load to justify anywhere near that.

I can use my ‘18 Platinum as an example, and may have the same setup as you. Probably very close, if not.

I currently run 275/65-20 LRE Cooper AT3 XLT tires and tow a travel trailer that tips the scales in the 7,000# range. I’m probably over payload capacity with the ~700# tongue weight, but that’s not what this discussion is about.

I inflate my tears to 40-42# and the fronts to 40# when towing and it is excellent. With the WDH set correctly, I’m transferring a decent amount to the front, hence the near identical pressures.

In the heat of summer, I can watch my tires heat up and increase pressure to nearly 50#. Usually in the 47-48 range. Like yours, my TPMS reads accurately (?) up to 50# and then goes into error when it “should” read 51#.

There is a member here from Falken tire. If you hunt him down and relay tire specs and your max load, he may give you a good idea of what your pressure should be to carry that old with an apparent equivalent from Falken. It’ll be damn close…

 

Yeah 60psi seems way too high for any realistic weight you could haul, if you did the chalk test at that pressure I bet only a small portion of the inner tread touches the ground (and are balloons, resulting in major tread wear). 60psi is for a 1 ton truck with a pallet of cement in the bed. When I do the chalk test and load math the middle ground for Load D was 35-38 psi depending on what I’m hauling. I’d guess Load E is in the low 40s for a 1600lbish load.

 

Here’s a little calculator if you want to run your own info: And here’s a great thread with the Falken fella. His answer to my questions are near the end, which is likely super close to your needs. Reply to that thread and @his name to see if he’ll give you a personalized response:
https://www.tundras.com/threads/psi...ildpeak-at3-285-65-18-on-stock-wheels.104530/

 

You're right I may have been aired up higher than i needed to be... i'm used to the 65-75 recommended pressure on the duramax i traded in (and this reminds me now that i'm done towing to air back down)

I wasn't using my WDH so all the tongue weight was levering extra load to the rear axle, which tipped the scales at 4340lbs, above the rated axle capacity by a couple hundred pounds. I'll poke around at those links, thanks!

 

https://www.toyotires.com/media/sqld2inz/2021_commerical_loadinflationtables_v8.pdf

Download the inflation table. Look up your tire size and the estimated rear axle weight when loaded. It will tel you approximately what pressure to run. I also add a few psi to fine tune the handing and build in a small margin of error if I underestimate the load, but that’s me.