Low tire pressure light is ON - Hyundai Forums : Hyundai Forum
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#1 Old 10-20-2011, 06:33 PM
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Vovan
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Low tire pressure light is ON

It started to get a little colder here, and my tire pressure sign went on. i checked the pressure - it's 35 psi on all 4 tires - more than what's in the passport so i'm not sure what's going on. the light doesn't go off - it's been on for a week now. I called the service dept and the guy told me it happens to all cars with pressure sensors. He suggested that I fill my tires with nitro gas - that should solve the problem. I asked him what the problem really was since I believe the pressure is up to specs (it's higher not LOWER as the sensor suggests) but didn't get a definite answer. I did have a similar issue with my Tiburon but the light would disappear when I drove the car for 30-60 min. This time, it just stays on...
It's very frustrating since that message is the only thing I see on the display - to read other meters, you have to flip through the trip button and after a second or two it's back to the stupid tire sensor...
Anyone is having a similar issues?
Ideas how to solve it?

Thanks!
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#2 Old 10-20-2011, 06:45 PM
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The sensor will go off if you are more than a couple of pounds out of recommended pressure, whether it's too HIGH or LOW. Check proper inflation pressure in the label inside the sill of the driver door.

Whenever you set your pressure, you may have to drive for a few minutes before everything resets.

If your pressure is correct in all tires and the light won't go out, you may need to go to the dealer and have them recalibrate the system.

The nitrous line is BS. Air pressure is air pressure no matter what the gas. The only advantage nitrous gives is it won't oxidize the rubber and the tire will typically hold the pressure longer before needing more air.
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#3 Old 10-20-2011, 06:57 PM
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Vovan
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Originally Posted by fastlerner View Post
The sensor will go off if you are more than a couple of pounds out of recommended pressure, whether it's too HIGH or LOW. Check proper inflation pressure in the label inside the sill of the driver door.

Whenever you set your pressure, you may have to drive for a few minutes before everything resets.

If your pressure is correct in all tires and the light won't go out, you may need to go to the dealer and have them recalibrate the system.

The nitrous line is BS. Air pressure is air pressure no matter what the gas. The only advantage nitrous gives is it won't oxidize the rubber and the tire will typically hold the pressure longer before needing more air.
I thought so too although he said while he didn't know the reason behind this but apparently all of his customers who came to him with this problem and got nitrous said the light never came back on...

Oh, and btw, the pressure in my tires was set at the dealer so it's better be to specs. in either way when I checked the pressure it was after a drive so I expect it to be slightly higher and it was. 35psi. still, the light never came on until the temperature droped below 60F. The light was on last night when the temp was still pretty close to 60F (56F I believe).... Not sure what's going on...

Last edited by Vovan; 10-20-2011 at 06:59 PM.
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#4 Old 10-20-2011, 07:10 PM
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The tire pressure on my new Sonata was around 27 from the dealer. I brought it home and checked it. Put 37psi. no light.

Are you sure your gauge is OK?
I use an analog gauge. Never checked the accuracy, but my brother in law had the old fashioned rod pops out kind and there was a pressure difference between his and mine.
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#5 Old 10-20-2011, 09:10 PM
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It's not your guage or because your not using nitro. My car started doing the same thing. I took it back twice and its tough because aftsr you drive a while it goes away and then they don't see the problem. They checked the tpms and they all show good. They suggested I leave it over night so the can see it first thing in the morning when it happens. They offeres a loaner vehicle so I'm going to do it next week.

They filled mine with nitro when i bought it and when I checked my pressure it was at 29lbs. I think its a problem with the machine because its a wierd process. It drains the air out of your tires first and then fills it with nitro. The machine automatically inflates to a set pressure. They're looking into a possible calibration error with the nitro machine.

Nitro does everything they say but it does not change how the tpms reads. All they see is pressure. It doesn't matter if its 35lb of air, nitro, or meatloaf, its still 35lb.

I do encourage everyone to get one good reference gauge that cost more then $20. Its surprising how off some gauges are.

And to clarify, the tpms activates either when any one tire is more than 4lb off from any other tire and/ or when the tire pressure drops by 10lb from recomended inflation (35lb)

Last edited by leesrt; 10-20-2011 at 09:12 PM.
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#6 Old 10-20-2011, 09:19 PM
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Vovan
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Originally Posted by leesrt View Post
It's not your guage or because your not using nitro. My car started doing the same thing. I took it back twice and its tough because aftsr you drive a while it goes away and then they don't see the problem. They checked the tpms and they all show good. They suggested I leave it over night so the can see it first thing in the morning when it happens. They offeres a loaner vehicle so I'm going to do it next week.

They filled mine with nitro when i bought it and when I checked my pressure it was at 29lbs. I think its a problem with the machine because its a wierd process. It drains the air out of your tires first and then fills it with nitro. The machine automatically inflates to a set pressure. They're looking into a possible calibration error with the nitro machine.

Nitro does everything they say but it does not change how the tpms reads. All they see is pressure. It doesn't matter if its 35lb of air, nitro, or meatloaf, its still 35lb.

I do encourage everyone to get one good reference gauge that cost more then $20. Its surprising how off some gauges are.

And to clarify, the tpms activates either when any one tire is more than 4lb off from any other tire and/ or when the tire pressure drops by 10lb from recomended inflation (35lb)
Well, i measured it with two gauges and both say 35 lbs. it's hard to believe that they are both off by 10 lbs. so i think it's safe to assume that the tires are at the right pressure.

so why is the light on, Hyundai?
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#7 Old 10-20-2011, 09:37 PM
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In there defense its not uncommon. I was in auto sales and saw this quite a bit. One of the sensors is a little off and it takes forever to find which one. The more expensive type that actually show the pressure in each tire on your display are easier to troubleshoot.
Two things that surprised me about this car. They didn't get the better tpms and no memory seats.
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#8 Old 10-21-2011, 10:37 AM
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My car was delivered with nitogen in the tires and I got a low tire pressure light after about 8 months. All 4 tires had low pressure when I checked with a gauge - filled them with air and the light went off. In my case - all worked as hoped in that when the warning light came on all tires looke OK, handling and steering felt OK, tire pressure was below spec, and warning light went off when tires were properly inflated.

Good luck with your issue. Don't let the dealer sell you nitrogen just to turn off the TPMS light. If you want nitrogen for the other benefits, then do it, but have the dealer fix the warning light first, while there's still air in the tires.

Ron
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#9 Old 10-21-2011, 10:57 AM
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Dealer should be able to plug in to OBD port and see what values are being reported by each sensor. The car knows how many pounds are in each tire, even though it doesn't display.
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#10 Old 10-21-2011, 11:25 AM
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cdelena
After getting a light unexpectedly I found that one of the tire pressure gauges I have been using (actually the one that appears to be higher quality) reads 4 psi low. The sensors on the car seem to be right on.
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