if there is a reset?

background-
NYC had weather in the teens for a few days- everyone I know who had "sensors low pressure" from wife lexus to buddies mercedes had same problem.

today its in the 40's and my sensors are going off - like rolling tire to tire lights up front to back.
Brought it to a place- computerized air pressure monitor -
all tires are exactly 35pounds -
But the sensor even when driving will light up
first rear right
then 2nd front right
etc etc etc

any clues? maybe a way to reset ????

 

When mine went off in the cold weather, I found that the pressures were low at that temp. But once I corrected it, the warning cleared ... after the wheels were moving again.

 

They should eventually reset themselves if all tires have the same pressure.

 

i thought it would reset or stop today- drove 20 miles
high 40 degrees…
one second shows left low
next second shows right
then back and forth

I just might do what someone suggested after a few more days

"Turn ignition off and deflate tires at least by 25%
Turn ignition on and inflate tires to correct pressure
Let it settle for a couple of days, and it should all go good.

The advice was given based on the the following facts:

1. The TPMS system recognizes a variation of 25% of the original pressure, so if it gets confused, it expects you to reinflate by 25%. This is the type of value you may expect from a puncture.
2. If you do it with the ignition off, it doesn't recognize the change in value, computers are off.....

So skeptically, I tried it as a last resort... and remarkably, it worked... has to be worth a try

 

My TPMS are going off on a weekly basis but my tires continually are losing pressure (-30C) here on a daily basis so I am continually filling them up with air. I have the 20" selena's and the pressure states max pressure should be 50 psi (I inflate to 40) and within a week they are below 30. The TPMS clears itself as soon as they are inflated over 35 psi.

Long story short I am taking the car in on Monday and the dealer is going to swap out the sensor's as the originals that came with the car (2009) have been known to be the issue. Hopefully that fixes the problem. Until then continue to inflate.

 

You must also allow for temperature differences between when you check the pressure and when you are driving. Allow 1 psi additional cold measured pressure for every 10F (5C) you expect the temperature to drop. Mostly these issues arise in winter when people assume the pressure is correct in their nice warm garage and then drive out into the cold.

The TPMS measure pressure and temperature. If the resulting calculated number is below a certain level (around 6 psi low) then the fault goes off for that wheel. Jaguar's system does not compare tires nor does it calculate pressures from relative wheel speeds it uses actual air pressure/ temperature readings inside each tire.

If you get a fault you must check the pressure when the tire is as cold as it is normally going to get, not when the tire is still warm. Add pressure above the recommended amount to compensate for any expected lowering of operating temperature conditions. I run 36 psi "cold" as measured in my garage (10C or 52F approx) which should be good to down to minus 15C (about 0 F). If it is to get to minus 20C or colder then the pressure as measured in my garage must be raised to 38 psi, and so on. You must never exceed the maximum cold pressure stated on the sidewall at any ambient temperature, however. Remember to adjust pressures down when warm weather returns.

 

Seems to me that the TPMS should just display the tire's pressure a minute or so when the car is started to let the driver know the pressures in each tire. Makes more sense to me.

 

I had the car for 50,000 miles- anytime it went off? the tire was low or there was indeed a nail or slow leak.Now with the NY weather hitting 12-17 degrees it goes off-
I put it back to 35 the recommended pressure-

and each tire intermittently lights up - or in 5 mile run each tire lights up one by one round and round- first left back then right from etc,,, I'm talking in a 5 min period as i drive… and the temp here is now 48 degrees-
my other friends who had this when we were in the low teens- it stopped.

so today in desperation I did below what the other person said worked
will let u know by weekend if this worked-
Turned car off - reduced pressure in each tire to 17 lbs
turned on car and inflated to 35lbs

----

 

In theory it is supposed to warn the driver of dangerously low pressure when the car is in motion so your idea would not fulfil the legislated objectives. What would be nice is a dashboard readout showing the actual pressure, and possibly temperature. Porsche displays actual pressure.

It woud be nice if an override button existed to switch the feature off once per ignition cycle but the lawmakers won't allow that either.

 

I had a Dodge Charger rental when I drove back from SC. I stopped overnight in OK City and it was freezing in the morning, all the tyres were showing low and one was in the red (pressures displayed but I can't recall) I stopped on pulling out of the hotel for a physical check and all looked good, it was mid afternoon and many miles before all four came back to normal.

 

That is the temperature effect I describe.

 

amazingly enough- after 24 hours of doing what another suggested below-
all seem to be functioning normally!!

=========

I just might do what someone suggested after a few more days

"Turn ignition off and deflate tires at least by 25%
Turn ignition on and inflate tires to correct pressure
Let it settle for a couple of days, and it should all go good.

The advice was given based on the the following facts:

1. The TPMS system recognizes a variation of 25% of the original pressure, so if it gets confused, it expects you to reinflate by 25%. This is the type of value you may expect from a puncture.
2. If you do it with the ignition off, it doesn't recognize the change in value, computers are off.....

So skeptically, I tried it as a last resort... and remarkably, it worked... has to be worth a try

 

I had this problem only with left front tire showing low (when all tires were 32-33 psi). Did the above procedure on that tire and problem solved. This is most appreciated. It saved me a trip to the dealer.

 

I've tried everything including that to no effect. I've ordered a TPMS control module and am going to replace that next.

 

N8ertot did you ever figure out what the issue was?

 

cold temperatures cause unnecessary concern for tires.

I really appreciated the actual PSI reading my BMW gave me. it allowed me to constantly keep track of what needed to be changed, when and how much.

 

This is a known problem with Jaguars. There is a technical service bulletin, #JTB00317NAS2 from 12-2-2013 that describes that exact problem. My 2012 XF Supercharged does it periodically. The fix is a reflash. Models affected are 2009-12 XF and 2007-12 XK.