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jeepjoe 10-16-2010 06:27 PM

optimal tire pressure
What's the optimal tire pressure? I have p245 size on my 07 Grand Cherokee. The tire light went on so I checked it (around 30 psi) it says on tire max is 44 but I went to 33 in all tires and light stayed on. Now im up around 40 and light goes on and off as I drive it. It flashes when it goes on. Before it was solid on. What do I do

DJ BoNiOmArIo 10-16-2010 06:30 PM

Re: optimal tire pressure
put it at 36 and see how it does

DJ BoNiOmArIo 10-16-2010 06:30 PM

Re: optimal tire pressure
make sure the tires are cold when you do this though as the tires warm up during regular drive ... I set mine at 36 and no light at all ... or it can also be that your TPMS batteries are giving out happened to mine ...

4x4Street 10-16-2010 08:59 PM

Re: optimal tire pressure
If you set the pressure to 35psi and the light stays on or blinks, it's not a pressure problem. If the tire pressure lamp is flashing, usually for about 60 seconds, then there is a fault in the system. A bad tire pressure sensors is most likely the cause. You'll need a tire pressure sensor tester to find the bad one. Your local repair shop or dealer can help you with that.

AcidCold 10-16-2010 11:55 PM

Re: optimal tire pressure
I run mine at 48psi since my tires are D rated.

dmlong47 10-18-2010 03:05 PM

Re: optimal tire pressure
could be your spare tire is low, i always forget about that ones

on the drives door theirs a sticker that has your tire pressure setting for the censor mine says 32 low

jeepjoe 10-18-2010 04:01 PM

Re: optimal tire pressure
oohhh the spare i didnt even know that had a connection. i will be checking these when i am off next. thanks guys

DaveJKJ 10-18-2010 05:09 PM

Re: optimal tire pressure
Make sure the spare is aired up. I had that happen to me and it was the spare.

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