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  #1  
Old 09-24-2014, 10:19 AM
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Low tire pressure warning

We had our first cool night and at startup I received the message in console that one tire was low. Drove to nearest gas station and added air to all tires. The display told me all four were at 35 lbs, but the right front tire image still glowed red. Also the low tire icon in lower right of dash stayed lit.

So I drove to the dealer which is only 1/2 mile from the gas station to ask how I reset this. Service guy said just drive a few miles & it will clear out.
It did not clear out. All four show 32 this am, and the display tells me to air up to 36 lbs.

There must be a way to reset this. I don't want to run 36 lbs cold, to harsh of a ride. I'm wondering if anyone else has had this issue?

TIA,
David

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Old 09-24-2014, 10:47 AM
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Re: Low tire pressure warning

Driving usually does reset them, so maybe you do have a problem.

In the meantime, set your tire pressure using a good tire gauge. In fact I always go with the gauge and let the technology say whatever it wants. It's usually within a pound. That always worked before we all this great technology.


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Old 09-24-2014, 10:52 AM
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Re: Low tire pressure warning

I had this issue also. I am Canadian so my tire pressure is measured in Kpa. I got a warning that my right front was low. Can't remember at what pressure it tripped but the light did not go off when I inflated until it reached the pressure recommended on the display. Wish I could be more helpful but it appears it only re-sets at a specified pressure. I think mine was 244 Kpa which converts to 35 Psi or thereabouts. I have 20" wheels on my 2014 GC Ltd.


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Old 09-24-2014, 11:28 AM
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Re: Low tire pressure warning

Mine will never reset until the vehicle shows it at 36 psi. If you want to keep them lower but clear the error, you could inflate them to 36 to clear it, then let some air out to your desired pressure I guess. Not an ideal solution, I know.

Not sure about the driving to reset, as hitting 36 psi has cleared the message immediately every time for me (32 psi seems to set it off as too low).


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Old 09-24-2014, 11:52 AM
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Re: Low tire pressure warning

I drove 3 Mercedes SUV's prior to this vehicle, and on those you could reset the initial value after correcting a low air condition on one or more tires.

It seems odd that Jeep does not have the same protocol. Oh well.

Headed out to air all the wheels up to 37 just to be sure. I'll drive a bit then let them down after the message clears.

Thanks for all the quick replies!!
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Old 09-24-2014, 02:56 PM
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Re: Low tire pressure warning

There is approximately 1 lb. difference in air pressure for every 10F degrees change in temperature, so once days start running about 60F (October around here) I will increase my pressure 2 lbs. above door sticker to compensate for colder weather tire pressure drop.
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Old 09-24-2014, 04:14 PM
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Re: Low tire pressure warning

The TPMS doesn't update immediately, it has to be driven, so best method to drive about 10 minutes, look at the display and then measure the tires with an external gauge so you know how far off the two are. Then use the gauge to air them up so the TPMS will quit complaining---after driving for a few miles.

You could actually have a problem with the tpms, but it won't be that easy to tell until you DO air them up and drive it several miles, then take it in and ask the dealer to use a hand gauge in addition to the tpms.
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Old 09-25-2014, 12:00 PM
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Re: Low tire pressure warning

So I aired all four tires up to 38 by my hand gauge. The service station inflator with built in gauge was telling me 42 lbs. This would explain why I failed to correct the situation the first time. . The TPMS dash display told me I have 37 lbs now, and all is normal.

Funny coincidence, my wife came home yesterday evening and told me of a warning light in her 2013 ML350. Same problem. Imagine that. Aired hers up to 45 front 49 back and all is good.
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Old 09-25-2014, 12:13 PM
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Re: Low tire pressure warning

I can't believe anyone would trust those gas station pumps for accuracy.

At least this time it wasn't Jeep's fault, not even the dealer.

User error!

Glad you got it taken care of. Keep in mind, if you have a relatively cheap tire gauge, it will not stay accurate as long as a good one.


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Old 09-25-2014, 12:45 PM
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Re: Low tire pressure warning

Quote:
Originally Posted by bill_de View Post
I can't believe anyone would trust those gas station pumps for accuracy.

At least this time it wasn't Jeep's fault, not even the dealer.

User error!

Glad you got it taken care of. Keep in mind, if you have a relatively cheap tire gauge, it will not stay accurate as long as a good one.


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The little digital ones seem to stay pretty accurate. The Accutire MS 4021B Standard Digital Tire Gauge [$13 at Amazon] even got a good review from Car and Driver, other than it only reads 0.5 lb, which is good enough for road vehicles, not racers.

The cheap pencil ones you can buy nowadays are inaccurate before you leave the store.

The really expensive mechanical ones are harder to keep accurate, as one good drop on the garage floor and they tend to go off calibration, plus anything based on a Bourdon tube needs calibration and temperature compensation.
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Old 09-25-2014, 01:54 PM
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Re: Low tire pressure warning

On my first trip to the gas station I inflated all tires to 40 on the station's gauge. I thought that would cover me with a 10% error factor. Wrong.

I've always been happy with the round dial on a stem type gauge. They seem reasonably accurate. The release button seals wear out after a while on this style. I have both 0-60 and 0-160 range. I never trust those POS stick type. I think China ruined that style with cheap production.

OK, I ordered two of the Accutire MS 4021B Standard Digital Tire Gauges from amazon. I think my wife can work one.
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