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Old 10-16-2010, 05:27 PM
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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
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Old 10-16-2010, 05:30 PM
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Re: optimal tire pressure

put it at 36 and see how it does
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Old 10-16-2010, 05:30 PM
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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 ...
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Old 10-16-2010, 07:59 PM
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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.
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Old 10-16-2010, 10:55 PM
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Re: optimal tire pressure

I run mine at 48psi since my tires are D rated.
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Old 10-18-2010, 02:05 PM
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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
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Old 10-18-2010, 03:01 PM
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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
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Old 10-18-2010, 04:09 PM
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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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