: Anyone elses tire pressure monitor read 0 when its not flat?



GNSCOTT
10-28-05, 04:44 PM
I drove home thinking I had a flat tire because the monitor flashed "0". I get home and check the tire with a guage and its at 30psi. I start the car back up, still reads "0", drive it for a sec, then it goes back up to 30. Sucks that I drove the car 50 miles home from work at 55mph since I barely get to take the wifes V to work.

benjet
10-28-05, 05:19 PM
I have one that's fading....it reads 0 sometimes or "--" and then normal the next minute. I hate problems I can't have the dealer verify.

GNSCOTT
10-28-05, 09:07 PM
That is exactly what happens to me. One time it read like 15psi and my wife called, and she said as soon as I picked up, it went to normal. I get the same 0 or -- reading sometimes. I did not notice if it was the same tire or not. Have to remember it for next time. Mine was the driver rear last time.

Florian
10-28-05, 10:08 PM
my guess is that the TPS sensor is shot.


F

tedcmiller
10-28-05, 11:12 PM
There have been many threads opened on this same problem. The TPM in the tire is defective. I have had similar problems on two TPMs. Replace it. If dealer wants to see it fail, don't worry, it will eventually go into a solid failure mode (or long enough to get to the dealer and show it).

newvie
11-01-05, 03:20 PM
This happened to me when I had new tires put on recently.

3 tires read 29psi but right rear read 0 prior to pulling out of the lot.

After I drove for a few minutes, all four indicated 29psi.

dqw1
11-02-05, 09:27 AM
I've had 3 TPS changes on my 04. And the readings are intermittant. Sometimes from 30 psi cold-jumps to 35 when I roll out the garage and back to normal within a couple hundred yards. To me its cool to look at but I no longer trust it to tell me the PSI. And its never the same everyday.
Is this TPS issue confined to the 04's?

tedcmiller
11-03-05, 10:03 AM
The fact that the TPMs don't indicate the same pressure from day-to-day is not an indication of a TPM failure. Many factors effect the pressure in the tire, not the least of which is the ambient temperature and whether or not a particular tire is exposed to direct sunlight. Getting a false indication of low or no pressure due to a TPM failure is an annoyance, but TPMs are really necessary when using run-flat tires. When using non-run-flat tires, the TPM can warn of slow leaks and other similar problems before you are stranded by the side of the road (temporarily, if you have a spare and a jack).

CTSVONFIRE
11-03-05, 10:36 AM
You could always have the dealer disable them, and you won't have to worry about it.

dqw1
11-03-05, 01:57 PM
The old fashion way of checking tire pressure works best. I've switched to watching the G meter now. I guess I need a good digital gauge, any good ones at AutoZone, O'Rielly's, etc worth buying?

tedcmiller
11-04-05, 10:52 AM
TPMs are a better way of monitoring tire pressure, and thanks to the NTSB they will be mandatory on all cars in the near future. This requirement will apply even if the car does not use run-flat tires. Besides warning of impending or immediate problems, TPMs force people to keep the tire pressure within reasonable limits since they display a warning when pressure is excessive just as they do when pressure is too low. My wife's DTS does not have run-flats, but does have TPMs. However, unlike the CTS-V, you can view only one tire pressure at a time. She normally keeps the info display on the outside temperature, so only TPM warnings are seen. There have been no TPM failures and the only time a warning was displayed was when I put too much pressure in the tires, and they exceeded the upper limit (42 PSI) while she was driving on an interstate during the summer. I think TPMs are a very good idea.