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#1 Old 03-22-2011, 11:05 AM
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This past weeekend, I loaded up with luggage and 4 adults and took off to Denver for volleyball tournament. It was 604 miles from my driveway to hotel. During the trip, in the middle of Kansas, the TPMS sensor light started flashing. It flashed for about 2 minutes, then went off. about 150 miles later, still in the middle of nothing, except a massive wind farm, it did the same thing. After that, it did not do it again, UNITL on our return trip home...just past Goodland, KS, it flashed again but stayed on this time. The duration was about 7-10 minutes, then went off. Another 100+ or so miles, it began to flash again with it again, staying on for about 10 minutes. The tires all had the same pressures in them, as they were checked and matched the morning of the trip and before we left the hotel for our return home. i haven't driven it since sunday (it's still dirty and covered in bugs)...but, checked the tires this morning for the heck of it. same pressures i set them too prior to the trip.

i know i won't be able to duplicate this for the dealer...so, i don't see a need to take it in there and watch them scratch their heads and start throwing theory's out there. or, should i take it to them, so it is on record that i am having an issue with this.

any ideas???

fyi...this is the second time this has done this to me. the first was last september, when i took it up to Des Moines for a soccer tournament...it flashed on the way home, but i chalked that one up to the nearby Hospital. it hadn't done it since then, but then again, i haven't taken a long trip since then either.

btw...i didn't make it there on one tank...but, i did make it home on one tank of gas...and still have a qtr tank left (approx 600 miles).



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#2 Old 03-22-2011, 12:11 PM
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My Sonata has had the blinking TPMS a couple of times, and it was Police/EMS radio that set it off. Different agencies use different bands of the RF spectrum and two areas of our home turf use a frequency that is a harmonic of the Hyundai TPMS frequency. So we just use it as a "cop in the area" indicator. TPMS = "The Police Man Speaking" (on the radio).

I think the root cause is that the sensors Hyundai uses don't generate a very strong RF signal (meaning "cheapie") and so they can be shouted down by other radio transmitters broadcasting at 1/2, 2x, 4x, etc. The blinking light means the little receiver under the dashboard lost contact with one or more of the four sensors. I remember reading here, in a different thread, that other members noted the same issue when they had a cell phone or other electronics in the cubbie in the console.
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#3 Old 03-22-2011, 01:16 PM
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Thanks,

since it was so sporadic...that is what i mentally chalked it up to....but, wanted some other opinions as i claim not to be any sort of expert on tpms's.



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#4 Old 03-22-2011, 01:31 PM
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FYI, I had my light come on when I got back from a long business trip (car had been sitting in a parking lot for over a week). I had access to an accurate air gauge and a compressor so I slowly let air out of each tire and noted when the TPMS light came on. All four came on at about 27 1/2 psi. I don't know if the sensors on all three OEM wheel sizes are set the same, but this was on the 17's.
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#5 Old 03-22-2011, 03:11 PM
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Only one of you mentioned that you checked your tire pressure. Pump them up to 35psi when they are cold and I'd wager your light stays out. The light is trying to tell you something.....correct?

P.S. Cheap? They're $350 for a set of four.
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#6 Old 03-22-2011, 08:15 PM
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Was it the yellow TPMS that illuminated... OR was it the low air indicator ??

Makes a difference what was illuminated..

IF "TPMS" was illuminated.. scan the module and see what is stored.. did you happen to drive by any kind of cell tower, .mil installations, any other sort source for RF interference ?? NAV cord or phone power cord or other plugged into the PWR outlet ?

Been talked about at school that some of the cords themself may emit RF interference that **** with signal received from rear as the module is typically there close to the outlet.

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#7 Old 03-23-2011, 10:34 AM
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ok...curiosity up...

i thought we only had the TPMS indicator, the yellow/amber cut away of a tire (horseshoe shaped) with an exclamation point in the middle. what is the low air indicator?

on the way out, when it flashed....i scanned the area...didn't see anything that would trigger it, at least from what i would think would trigger it - cell tower, highway patrol radio tower, hospital. it was vast farmland. second time...same thing. on the way home...it wasn't until the fourth time it had happened that there was something in the immediate area, the massive wind farm.

so, are you telling me that the dealer can scan the computer and it should have some stored codes in it if the indicator has gone off before? i drove it today, first time since sunday...and am going to go out at lunch and check the pressures once again just to make sure they are all the same.



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#8 Old 03-23-2011, 01:43 PM
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Yellow [b]TPMS = control module

Yellow flat tire symbol with yellow "[b]!" = we have excess high/low air or excessive pressure spread somewhere..

IF "[b]TPMS" was illuminated, then scan of module should find stored code.. hi/low pressure typically does not store codes..

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#9 Old 03-23-2011, 04:07 PM
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From page 6-9 of the manual:
QUOTE
Quote:
•The TPMS malfunction indicator may be illuminated if the vehicle is moving around electric power supply cables or radios transmitter such as at police stations,government and public offices,broadcasting stations,military installations,airports,or transmitting towers,etc. This can interfere with normal operation of the Tire Pressure Monitoring System (TPMS).
•The TPMS malfunction indicator may illuminate if snow chains or some separately purchased devices such as notebook computers, mobile charger, remote starter,navigation etc.are used in the vehicle.This can interfere with normal operation of the Tire Pressure Monitoring system.
What my wife calls "the horseshoe" is the one and only indicator for the TPMS. If it lights up solid, there is allegedly a low tire. If it blinks but doesn't stay on, there is a temporary problem with the system (cr@ppy Siemens transmitters unable to cut through RF noise). If it blinks and stays on, there is a problem with the TPMS. So far, it appears that "blinking horseshoe" incidents indicate that tire pressure is fine, but there is an RF interference issue.

I have a buddy with a Santa Fe with the TPMS light on solid (it has the horseshoe and also "TPMS" as a separate light). Likely cause - they dumped a can or two of Fix-A-Flat into a rear tire a couple of years ago. But here's some good news for people in New York - During last state inspection, they said TPMS is ignored during annual inspection and it doesn't matter if the light is on or not. So the Santa Fe continues to rack up trouble-free miles while providing the warm yellow glow of the TPMS indicator as mood lighting that offers a slightly jaundiced tinge to the driver's complexion.

The Sonata combines the two indicators into one, and the result is that you have to understand Morse Code to know what's wrong. I told my wife to ignore it completely. After watching all those "Wildest Police Chases" episodes, I am confident she too can simply drive home on the rims with only minor collisions with curbs, chain link fences, and fire hydrants.
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#10 Old 03-25-2011, 11:36 PM
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WalkGood
QUOTE (fear24 @ Mar 22 2011, 09:05 AM)
Quote:
This past weeekend, I loaded up with luggage and 4 adults and took off to Denver for volleyball tournament.

How'd ya do in the tournament?
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