Low tire indicator

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my wife's 07 Santa Fe just had the low pressure indicator come on for the right rear tire. Checked pressure and its same as front. Even added a pound of air to all tires but still showing low pressure.
Thought it might be because last night temp got down to 55, but drove car at least 15 miles and still the indicator is lit.
Is there anything I can reset so I don't have to drive 60 miles to the dealership?
Thanks,
Jim
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What does the manual say? Did you go through more than one ignition cycle?
HMA Service does not show a particular reset that I can see, but reading this indicates reset should be automatic.
General Description The TPMS display device is located on the instrument cluster to provide information about TPMS operating conditions and tire pressure. The TPMS display device is consist of TREAD indicator lamp, Location lamp and TPMS Warning indicator lamp. The TREAD indicator lamp is turned on when pressure of one or more tires are below the warning limit level. And then, the location lamp displays the tire position that is the pressure below the warning limit level. The TPMS Warning indicator lamp is turned on if there is the failure in the system.
Troubleshooting: a.. Information to ascertain (TREAD Lamp) :
Was puncture repair fluid used (it should not be)? - This can cause the sensor pressure port to block and incorrect warning to occur. What temperature were tires last inflated at? At what temperature did warnings occur? - Pressure change is approx. 1.5psi / 10 C increase. Have the tires been checked / inflated since the lamp first came on? b.. If the TREAD Lamp is on :
Check for short circuits. Enter Diagnostics and read TREAD Warnings Local Identifier Data. Check to see if warning type is under inflation or leak. If the warning is for under inflation, then: a. Re-inflate the wheel with the matching sensor ID to it's desired Placard pressure. b. Check to make sure that the TREAD lamp turns off (this may take up to 1 minutes if the tire is not rapidly re-inflated). a. If the warning is for a leak, then: b. Fix any puncture and re-inflate the tire to the desired Placard pressure. Wait up to 1 minutes and make sure that the TREAD lamp turns off and the lamp does not turn on again. c. If lamp comes on again: d. Re-check pressure for signs of a puncture and Re-Check TREAD Warnings Local Identifier Data. c.. If the Placard pressure is OK and the TREAD lamp still does not turn off :
Turn wheel a quarter turn and again wait 1 minutes (the sensor may be in an RF null). If the lamp still does not turn off : check for loose receiver wiring and replace the receiver with a known good one if necessary (follow configuration & learning procedure). - If the problem still exists, replace sensor. - Ensure that all tires are inflated to their correct Placard pressures. - Clear TREAD warnings. - Test drive the vehicle and ensure that the TREAD lamp does not come back on.
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Manual insinuates that the tire must be low. That is all. So evidently, there is something wrong with the information transmitter which it says is mounted in the tire behind the valve.
Vehicle has been thru multiple ignition cycles since it first came on. And, several more since I upped the inflation in the tires.
Guess there is no way to avoid going to the dealership.
Thanks for the information.
Jim

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Just returned from store. Light was on when going there, but was off when I returned. Noted that the outside temp was now 75 degrees, so perhaps it is the cold. Will see again next month when temp will probably get down to lower 50's.
Jim

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Temperature certainly affects pressure, but if affects all tires the same. Could be one sensor is temperature sensitive. If it continues to happen the same way, I'd take it back to the dealer. We may not see 50 for an other month either, but we are on the low end of it :(
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And that sir, is precisely why I don't like all of the features being incorporated into cars today. Many are indeed useful, but sometimes they are simply problems looking to surface, which really address no real shortcoming in the real world. For those who "need" tire pressure monitors, then they can deal with the issues, whereas a simple look could have been equally or more informative. But - gadgets do attract us sometimes, and this is one of them. Now... on to a discussion about those ridiculous back up cameras...
--

-Mike-
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The low temperature certainly could be the issue, as mentioned in a Hyundai TSB. What's the pressure in the tires, and what's recommended on the placard on the driver's door pillar?
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Good question, I see I didn't put down the reading. It was 26.5 in both front and back on passenger side (back tire was what was getting the low indication). Driver's side had 27 lbs. Certainly doesn't seem low do you think?
Thanks for the reply.
Jim

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Yes that does seem low. What does the placard say on the driver's door for tire pressure?
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Sounds low to me as well. The lamp is to come on when the tire is 20% or so low. I'd recommend 35PSI in this vehicle, but suspect the placard may say 33 or so. That brings us back to the question: What does the placard say?
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Placard says 30 PSI. I put 32 in wifes 07 Santy. Then checked my 07 Santy, which hasn't been in for a service yet, and the tires were setting dead on at 30 PSI. Upped mine to 32 also.
Placard saying 30 PSI and the tire with the indicator being 26 1/2, that is just over 10 %. Probably be a good thing to mention it to the service manager next time I'm there, don't you think?
Thanks for all the responses to my concern.
Jim

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Whether it's 10% depends on how the sensor measures pressure. If it's measuring relative pressure to the atmosphere (the same thing you measure with your gauge), then I agree it's about 10%. If it's measuring actual pressure, then it's more like 20%.
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HT,
Have you looked at the tpms units on the Sonatas for 08 (and most others I assume)? It appears to me that they have a lithium cell (CR2032) and I asked the service department on the servicing of these things. I guess I wait until the TPMS light comes on? One of the techs suggested I go to nitorgen (don't shoot me, just stating facts!) as an alternative to keep these things rust/corrosion free. Why not use the ABS signal as an indicator? The circumfrence of a tire changes a with it's pressure, right?
--
Steve, 2008 Sonata SE

http://lasvegas.craigslist.org/rfs/463926931.html
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I've only had a couple off and haven't paid much attention. I don't think the battery is replaceable. If you have a system which tells you which tire is low (not sure which cars have which system), there is a transmitter in the fender well which sends a radio signal to turn on the TPMS sensor. I.e., it's off when needed, saving on battery life.
GM actually used a system which used the wheel speed. It proved troublesome. Rotating the tires would cause the tire pressure lamp to illuminate a few miles down the road.
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But, at least on my GM model, you can just press the reset button so it can adjust itself to the new position/condition.
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Thanks HT. I assumed it would be replaceable by the photo of it I have seen. That makes sense though, kinda like WOL (wake on LAN).

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I have 4 tire guages, some of them show that my 06 sonata w/17's have 20 lbs, others show 25 or 30, anyone know where to buy an accurate tire guage???? Sidewall says 41 PSI. I filled them to 40, then went to Discount Tire for rotation and (where they say they check pressure) when I checked again they were back to 22...NEED a good guage!
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Any autoparts store will sell a decent tire pressure gauge. Generally, if you're getting sporadic readings it's because you're not holding the gauge down fully on the valve step when you take the reading. Make sure if you use a stick type that you push the stick back in after each attempt to read pressure.
That marking on the sidewall of your tire is the max tire pressure. It is not the recommended tire pressure. 40psi is high for a car like that. Likely it should be between 30 and 35psi.
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I bought one of those digital guages from Sears several years back. Since then I've purchased the Black and Decker Air Station cause I have Bikes, Cars, and a golf cart to keep tires pumped up on. Both guages are dead on to each other. Doesn't mean they are right but two outta two ain't bad.
I like the B&D Air Station cause you set what pressure you want and it will automatically shut off there, and moving on to the next tire, just have to turn switch off and then on. Pressure is equal on all tires.
(No I have no stock in B&D, nor do I work for them).
Jim

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Deck wrote:

    Ditto what Mike M. says. Additionally:
At one time I had about 10 of those "stick" gauges. They did not agree. The round dial type also seemed off.
    I ordered a digital gauge from JC Whitney. I've had it 12 years and never even changed the battery. I have another digital I picked up at a garage sale and I use that also.
    Sweetie got a new car and I bought her a digital gauge from Harbor Freight for less than $10.00. It was nicer than the two I have, and... all three agreed. I will buy this one for myself when I get a chance.
    I threw all the crap gauges in the scrap bin and never looked back.
    Some wise person pointed out to me that most store/station tire gauge/chuck devices spend their days getting dropped on the ground, and were not to be trusted. 10 years of bringing my own gauge has showed me this is, indeed, true.
Tires: your life is riding on them.
PB
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