Forum Discussion

mtofell1's avatar
mtofell1
Explorer
Feb 11, 2019

False Tire PSI Reading

All I can find on searches is TPMS questions and this isn't really one of those.... I don't think.

We've had a cold snap and yesterday the light on my 2014 Ram started telling me I had a low tire. So, I stopped into the shop and the kid told me the front/right only had 35# (should be 60). I thought it was strange since my truck tells me all 4 corners and it said 55. So, today I go check to see if it's lost any and every time with 3 different hand gauges it tells me 30ish at first and when I try a couple more times it pops to 60. The interior gauge also is telling me 60.

My question is can valve stems be bad and not produce a correct reading at first attempt? I've never had this happen before but since my 3 hand gauges and tire store kid's hand gauge all do the same thing I'm thinking there is something wrong with the tire. The tires in question are only a few months old.

12 Replies

  • Tvov's avatar
    Tvov
    Explorer II
    mtofell1 wrote:
    ....

    My question is can valve stems be bad and not produce a correct reading at first attempt? ...


    Valve stems certainly can be "bad"! And they are very easy (and usually inexpensively) replaced at most any shop or tire store.

    Dirt, gunk, sludge or whatever can muck up a valve stem, and it is usually easier and quicker to just replace it. If there is a piece of dirt in the valve stem, it could be jamming randomly the movement of the valve, explaining weird psi readings.
  • I wonder if its just a issue with the cold temps allowing for false readings on the TPMS senders? I had many "false alarms" on my minivan with TPMS at extreme temps especially if parked up against a curb. Could there be some moisture in the valve stems causing errant readings on your gauge? Perhaps get it into a heated shop for a few hours and try your readings again. My 1 ton usually sits at 60-70psi for towing but was horrible on snow. I finally got smart and aired down to 45psi for winter driving as my contact patch at "towing specs" was tiny and dangerous! Hopefully this is just a weather issue and not batteries dying in the senders.