TPMS nagging is getting old..

[kurek]

To be clear I know I can simply turn off TPMS entirely with JSCAN but if it didn't completely suck it would still be handy both for safety and convenience. Nannies are fine in principle but a nanny that is objectively wrong is unacceptable.

Here's the problem; the factory setting for minimum pressure I think was around 40psi which meant if I had them at 45 in the afternoon at least one would be down to 39 first thing in the morning while the air is cold... and then I'd have this dumb warning flashing at me for several days because it doesn't just reset when you - or the sun's warmth - fix the problem.

So I used JSCAN to set the minimum pressure to 25psi, problem not solved. For some unknown reason now if it falls to less than about 32psi (not 25 and also not 40) it tells me to "fill to 25" .. and just like the factory behavior it takes several days for it to reset even if I fill the tires.

I recently got new tires and new TPMS sensors, behavior hasn't changed.

Aside from just venting, does anyone else have a different experience with TPMS? Does yours reset right away when you fix the problem?

 

[BWL]

View attachment 564587

To be clear I know I can simply turn off TPMS entirely with JSCAN but if it didn't completely suck it would still be handy both for safety and convenience. Nannies are fine in principle but a nanny that is objectively wrong is unacceptable.

Here's the problem; the factory setting for minimum pressure I think was around 40psi which meant if I had them at 45 in the afternoon at least one would be down to 39 first thing in the morning while the air is cold... and then I'd have this dumb warning flashing at me for several days because it doesn't just reset when you - or the sun's warmth - fix the problem.

So I used JSCAN to set the minimum pressure to 25psi, problem not solved. For some unknown reason now if it falls to less than about 32psi (not 25 and also not 40) it tells me to "fill to 25" .. and just like the factory behavior it takes several days for it to reset even if I fill the tires.

I recently got new tires and new TPMS sensors, behavior hasn't changed.

Aside from just venting, does anyone else have a different experience with TPMS? Does yours reset right away when you fix the problem?

Mine shuts up once the presures are back in range. I can go from -40 to +15c in a day when I travel and always fill at home with higher temps so I get the low pressure warning a lot in the winter until I drive enough for the tires to heat up. The answer is nitrogen as it doesn't fluctuate as much with temperature as air, but I'm too cheap and it's not near as easy to find as air.For me it seems around 38 psi is when I trip the warning and it doesn't reset until above 40psi but it seems yours is different. It believe it has a range limit for overinflation so fill to may mean deflate to. Id try setting it to what your usual low is and try that.

 

[62Blazer]

First comment is that if the target factory air pressure is 40 psi the warning lights should not be coming on at 39 psi. Typically there is a 15%-25% threshold before the warning lights come one, meaning the pressure can drop 15%-25% before the alert. They do that because obviously you would have to be constantly adjusting air pressure to maintain a perfect 40 psi all the time otherwise. Based on that if the target was 40 psi I wouldn't expect the warning light to trigger until it was in the low 30 psi range.
I am not familiar with JScan, but know that in AlfaOBD you can lower the TPMS threshold in one menu but you need to go in an do an RF Hub reset (believe that is the correct term) to actually stop the alerts.

 

[turkeybird56]

View attachment 564587

To be clear I know I can simply turn off TPMS entirely with JSCAN but if it didn't completely suck it would still be handy both for safety and convenience. Nannies are fine in principle but a nanny that is objectively wrong is unacceptable.

Here's the problem; the factory setting for minimum pressure I think was around 40psi which meant if I had them at 45 in the afternoon at least one would be down to 39 first thing in the morning while the air is cold... and then I'd have this dumb warning flashing at me for several days because it doesn't just reset when you - or the sun's warmth - fix the problem.

So I used JSCAN to set the minimum pressure to 25psi, problem not solved. For some unknown reason now if it falls to less than about 32psi (not 25 and also not 40) it tells me to "fill to 25" .. and just like the factory behavior it takes several days for it to reset even if I fill the tires.

I recently got new tires and new TPMS sensors, behavior hasn't changed.

Aside from just venting, does anyone else have a different experience with TPMS? Does yours reset right away when you fix the problem?

My tpms resets when I get to proper setting but may take a few drive cycles to totally reset. Also have the nanny Tire Fill Assist system that under specific circumstances does the beep and e flasher indication when filling tires when it decides to work why I use digital tire gauge.

 

[Dean2]

On our Dodges the tolerance is 20%. So if your door sticker says 60 psi, TPMS will alert at pressures below 48 psi. I did extensive research and messing around with this with AlphaObd on my 2021 2500. I wanted to run my tires at anywhere from 40 PSI to 50 PSI so I set the limits at 45 PSI. Warning does not trigger until pressure drops below 36 PSI.

The info in here should help.

What I Learned Playing With Tire Pressure

So prior to deciding to buy AlpHaOBD I was messing around trying to see how low I could set my tire pressures without setting off the low tire pressure warning lights. Door sticker for my 18 inch rims and factory Transforce AT tires is 65 rear and 60 front. First off, I have Selectable Tire...

www.ramforum.com