Tire pressure telltale

[cschuler]

The tire pressure indicator came on this morning and I took it to the dealer and the service manager said one of the front tires was at 32 psi, which is a bit too high. The manual states "This warning lights will also illuminate if
one or more of your tires is significantly under-inflated."

The dash display showed that the right-rear tire was at fault.

The display is now back to normal ... just thought I'd share what happened.

 

[darrell]

I actually run all 4 tires at 32 psi for a little softer ride.Cool weather a few days ago attributed to inflation of one tire dropping to around 29 psi causing the alert.After I inflated all tires to 32.5 the alert went away after driving a few miles.

 

[cschuler]

I actually run all 4 tires at 32 psi for a little softer ride.Cool weather a few days ago attributed to inflation of one tire dropping to around 29 psi causing the alert.After I inflated all tires to 32.5 the alert went away after driving a few miles.

That makes sense. What I was told at the dealership does not make sense.

 

[BacktoHyundaibychoice]

Rule of thumb is 1lb loss for every 10 degree drop. I personally don't see it from say 70 to 50, but I have experienced it from 50 down to 20 degrees.
If you're concerned (or even if you aren't) a good digital tire gauge is a cheap investment to keep in your glove box.

 

[Platgen]

The tire sticker states pressure of 33 psi. Therefore, 32 psi is too low, not too high. The dealer was incorrect when stating that the 32 would set the warning light.

 

[tjc78]

I run 32 in mine all the time and the light stays off.

 

[BacktoHyundaibychoice]

I run 32 in mine all the time and the light stays off.

As it should. By law, the TPMS warning must come on at 25% less than spec (on the placard). That would mean around 25psi.

"All new model year 2008 light vehicles shall have a TPMS fitted which is capable of detecting when one or more of the vehicle's tires, up to all four tires, is 25 percent or more below the manufacturer's recommended inflation pressure (placard pressure) or a minimum activation pressure specified in the standard, whichever is higher. The system should be able to detect when one or more of the vehicles tires are 25% or more below the recommended inflation pressure. "

Though Hyundai may enforce a stricter standard. Any idea how the manual describes it?

 

[dg_moore]

As it should. By law, the TPMS warning must come on at 25% less than spec (on the placard). That would mean around 25psi.

"All new model year 2008 light vehicles shall have a TPMS fitted which is capable of detecting when one or more of the vehicle's tires, up to all four tires, is 25 percent or more below the manufacturer's recommended inflation pressure (placard pressure) or a minimum activation pressure specified in the standard, whichever is higher. The system should be able to detect when one or more of the vehicles tires are 25% or more below the recommended inflation pressure. "

Though Hyundai may enforce a stricter standard. Any idea how the manual describes it?

I don't know about the manual, but my TPMS light came on when one of my tires had dropped to 28#

 

[Disaster]

Ours just went off. A check showed most tires at about 28 psi...with one maybe 26 psi. The general rule of thumb is 1 psi loss per month from just general leaking and another 1 psi for each 10 degree pressure drop (there will be variance depending on bead seal and moisture content in the fill air.) It isn't uncommon to get TPMS warnings in the fall, as temps drop...especially if you haven't topped the tires off in a while.

 

[vitacura]

My Genesis came with nitrogen in the tires, if I get a TPMS alarm and find a tire rather low, can I put in regular air or is it vital to find a nitrogen supplier?

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[Rey]

You can mix nitrogen and atmosphere air (which is mostly nitrogen).

I do long road trips and have experienced several false tire pressure alarms, each time occurring while on the road. I carry a pencil-type air gauge, and then check the tires. Usually the warning lite turns off next time I restart the car. Other times it turns off enroute without any prompting.

I think these sensors are set to lean towards a a false positive. Whatever, I don't think this is a warranty issue until the light refuses to turn off no matter what I do. At that point the problem is easily demonstrated to the dealer.

 

[Disaster]

My Genesis came with nitrogen in the tires, if I get a TPMS alarm and find a tire rather low, can I put in regular air or is it vital to find a nitrogen supplier?

Ambient air is 78% nitrogen, so it won't make a lot of difference. Eventually you will lose the slight benefit of the nitrogen fill...but it is very slight.

 

[vitacura]

Thanks for the info, good to know! I've never had nitrogen filled tires before.
I actually asked the dealer the same thing this afternoon and they told me that I can top the tire off with air from a gas station and when I bring it back to the dealer they would, free of charge, empty and refill the tire with nitrogen. Seems excessive.

 

[Adair42]

Re: Tire pressure

Does anyone know what the reccomended tire pressure is for the r spec sedan?

 

[swltf183]

Look on the car frame on the right side of the driver's door after you open the door for the recommended air pressure.

Regarding nitrogen, my dealer charged me $60 for it. When I balked, they said it was for life. I'm anal about tire pressure, so I'm interested to see if nitrogen in the tires will make a difference.

 

[tompass]

I have yet to have the indicator illuminate but does it specify which tire or just that a tire is below recommended psi?

 

[waveman]

I have yet to have the indicator illuminate but does it specify which tire or just that a tire is below recommended psi?

Both.

 

[tompass]

Thanks, good to know.

 

[Jimmmmbo!]

Look on the car frame on the right side of the driver's door after you open the door for the recommended air pressure.

Regarding nitrogen, my dealer charged me $60 for it. When I balked, they said it was for life. I'm anal about tire pressure, so I'm interested to see if nitrogen in the tires will make a difference.

100% Nitrogen: Just Say NO!

If nitro-filled tires really made a difference, automakers would be all over it to help sell their vehicles' case for higher mileage and better tire wear.

As a previous poster mentioned, our atmosphere is already comprised of about 78% nitrogen. Purifying it to 100% has never been proven to be cost-effective, let alone a proven difference in vehicle performance. It's literally just an additional sale item for the dealer just like Scotchguarding your interior.

As an aside, Mythbusters did an "objective" test kicking a football filled with normal air versus pure helium. The helium-filled ball actually did worse, although not enough to say it's the wrong thing to do. Just demonstrates the power of urban-legends ...

 

[SteveMS2012]

I have done some looking into this and felt the benefits didn't justify expense. Here is a cut and paste:

With nitrogen, your tire pressures will remain more constant, saving you a small amount in fuel and tire-maintenance costs. There will be less moisture inside your tires, meaning less corrosion on your wheels. You will not be able to feel any difference in the ride or handling or braking, unless your tire pressures were seriously out of spec and changing to nitrogen brought them back to the proper numbers.