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Old 05-04-2013, 08:10 PM
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Tire pressure monitor accuracy

Haven't seen any discussion on this, or maybe I missed it. I have a very accurate tire pressure gauge and it consistently reads 2 psi lower than the tire pressure monitor readings shown in the EVIC. Is there a way to calibrate the system, or do I need to take it to the dealer's service department?
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Old 05-04-2013, 08:16 PM
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Re: Tire pressure monitor accuracy

I have one . RR, that reads 1 pound lower than my gauge. The other 3 are right on.

Since you know that you are off by 2 pounds, why worry about it.

BTW - when was the last time you checked your very accurate gauge. Is it just possible ....



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Old 05-04-2013, 08:18 PM
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Re: Tire pressure monitor accuracy

Good points Bill. Time to stop by Autozone!
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Old 05-04-2013, 10:40 PM
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Re: Tire pressure monitor accuracy

When you have one tire pressure gauge, you always know what your pressure is.

When you have two gauges...you are never quite sure : >)
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Old 05-05-2013, 06:55 AM
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Re: Tire pressure monitor accuracy

I have observed the same thing. I truthfully do have an accurate gauge that I verify once a month or so. I have the luxury of access to such equipment and race motorcycles so I am a bit OCD about pressure. I also calibrate my torque wrenches
Anyway, only 2 of my tires read accurately on the EVIC. The other 2 are off by 1-3 psig. I wish I had remembered to bring this up when I had the GC in for the FI problem. Oh well. Knowing the discrepancy is there, I just account for it. I actually think that having TPMS makes one more neurotic about pressure than normal. We used to just check our tires at each oil change!
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Old 05-05-2013, 05:32 PM
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Re: Tire pressure monitor accuracy

Just had mine at the dealership. They verified the on-board system is reading correct pressures. Drivers front tire won't hold 42psi. Consistantly reads 35-37 soon after inflating to 42 psi. They supposedly found no problems with tire either.
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Old 05-05-2013, 08:38 PM
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Re: Tire pressure monitor accuracy

Just curious, why 42 psi? The door plate says 33, doesn't it?
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Old 05-05-2013, 09:27 PM
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Re: Tire pressure monitor accuracy

Because you get better fuel economy / less wear with higher tire pressures. I have mine inflated to 42 as well. Admittedly, you also get less grip and at some point also longer braking distances. However, if I find myself on sand/trails/snow I will lower them. Until then they stay high.
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Old 05-06-2013, 05:29 AM
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Re: Tire pressure monitor accuracy

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Originally Posted by jacko15 View Post
Just curious, why 42 psi? The door plate says 33, doesn't it?
Why 42 psi? It came from the factory with 42 psi. I ASSumed that was the optimal pressure. Door plate does say 33. The tire itself only says max. pressure 44 psi. Still have issue with front tire not holding preasure...ugh
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Old 05-06-2013, 05:35 AM
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Re: Tire pressure monitor accuracy

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Originally Posted by doulos4JC View Post
Why 42 psi? It came from the factory with 42 psi. I ASSumed that was the optimal pressure. Door plate does say 33. The tire itself only says max. pressure 44 psi. Still have issue with front tire not holding preasure...ugh
The door plate should be your best pressure. My MDX came with too much air in the tires. When I questioned it they found that their prep guy always checks the tires and fills them to whatever it said on the tire. At least he was trying, just didn't know what he was doing.


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Old 05-06-2013, 08:46 AM
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I just filled my wife's yesterday to what my gauge read was 50 but it is 43 on the display, except for the left front which reads 2 psi higher no matter what.
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Old 05-06-2013, 12:32 PM
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Re: Tire pressure monitor accuracy

I use a calibrated gauge and it too is off from the TPMS reading. Usually 1-3 lbs. Those that are running 42 psi you are using the center section of the tire and it will effect braking and handling. You will also wear out the tire much faster. Kinda negates the fuel savings. Really should be between 32 - 35.
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