we have a 09 ram 2500 with the tire light on...says low tire pressure....the truck has load range d tires on it...i know it came out with load range e's on it that call for a max of 80psi....the tires on it call for max 65psi....we aired them up to 65psi and the light is still on....was wondering if the only way to get the light out is to switch out to tires that call for 80psi? makes no since to me,lol...or will it relearn itself after driving? i looked in the door and it calls for 65psi front 80psi back....but ofcourse the tires on it are not supposed to be aired up past 65...tires are brand new and we don't wanna have to replace them...any info would be appreciated..oh, we did have the computer reset to 285/70/17 load range d tires with a starscan....maybe my tech is not going to the right spot to fix the tire pressure difference...we clear the code(low tire pressure) and it just comes back.....i know this question has been asked a thousand times but i can't find the right answer...thanks

 

If you have a 09 2500 you should post over in the 3rd GEN section as it is a 3rd.

As for your issue you mentioned the tires were changed. I would bet one, if not all your sensors are bad or missing.

 

Does the spare have a tpms module in it on a 2500. I'll bet if you have different air pressure, ie higher, in the new 4 then the old spare is lower. The new tires have been learned by the computer by now I would hope. so the spare might, I don't know, be reading low. Just a thought.
Just for the heck of it shove a 100 psi in the spare....Jus' kidding......


Edited....DoH just re read. Try it the other way around. Lower the air in the spare....

 

i don't think the spare comes with a monitor? maybe someone will chime in and say....i know some did, some didn't....not sure on the 3/4 ton though

 

The pressure monitor should come with the spare.

Have you driven on the tires much? With some vehicles, it takes a while for the monitor to catch on to the fact that the tire pressure is ok.

I'd bump all the tires (spare included) to max sidewall pressure, and drive on it for 20-30 minutes, preferably on the highway, so the tires get good and hot. That should give enough time for the sensor to figure things out, and the temperature will also raise the pressure of the tire a bit anyways.

If that doesn't do it, I'd be looking at doing one of three things:

- check (if possible) to make sure the sensors in the tires are functioning. They do have batteries, and batteries sometimes die.

- think about getting new tires in the correct load range.

- buy a $2 roll of black electrical tape and cover the warning light. Spend an extra $2 on a tire pressure gauge and use it weekly until its time for new tires again, at which time change out the sensors and get load range E tires.