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Dashboard tire pressure vs. independent tire pressure

Old 11-26-2018, 04:21 PM
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Dashboard tire pressure vs. independent tire pressure

This is the first car I have had with "advanced" TPMS, meaning the supposed actual tire pressure is displayed on the screen vs just a warning of low tire pressure. My tire's, via two seperate gauges, all show 36 lbs, which is what is called for on the door panel. The display screen on the car info screen shows all at 32 lbs. This is when tires are cold, and has been checked three times over three days. While in theory, having such exact pressure readouts available on the dash is great, if I believe the dash, they seem fairly low and need filing. If I believe the two different kinds of external gauges I use, they are fine. Has anyone else verified/compared the cars readout vs your own pressure gauges?
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Old 11-26-2018, 04:54 PM
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My dash pressure is the same as the readings I get on 3 different gauges.
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Old 11-26-2018, 05:09 PM
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Originally Posted by MI-RDX View Post
My dash pressure is the same as the readings I get on 3 different gauges.
same - I did both analog and digital reads when I first got the car and all read exactly the same. And the app is also showing the same.

OP may need to have the system recalibrated if thatís even possible
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Old 11-26-2018, 07:19 PM
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My 2019 Advance door jam shows recommended cold tire pressure as 33 psi all around, not 36. That said, I've checked my tire pressure with different gauges and things are running pretty true on my dash read out.
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Old 11-26-2018, 07:25 PM
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OK, maybe it's an A-Spec-non A-Spec thing, but mine definitely says 36 on the door. I have a digital and analog gauge that both say 36 but the dash shows 32 all the way around....hmmmm.
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Old 11-26-2018, 08:11 PM
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My dash readings are within rounding errors of measured pressures.. However, the Acuralink pressures are 2-3 pounds higher.
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Old 11-26-2018, 09:57 PM
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Originally Posted by EFR View Post
OK, maybe it's an A-Spec-non A-Spec thing, but mine definitely says 36 on the door. I have a digital and analog gauge that both say 36 but the dash shows 32 all the way around....hmmmm.
yes A spec 20ís call for 36 psi. Something doesnít seem right with you system and how itís reading the pressure. It must need a calibration because having 4 bad sensors would be unlikely.

have you tried putting in a little air anyway and driving a few miles to see if that resets the sensors? Or let some out and then refill to 36 per the manual read, then see if it resets.

Last edited by Dizzyg12; 11-26-2018 at 10:06 PM.
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Old 12-03-2018, 12:05 AM
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I find the air pressure sensors are very sensitive to temperature. Mine were at 36lb. It went down to -10C in Toronto last week and they read 29lb setting off an alert. Once 20C the tire sensor readings and independent gauge settings are pretty close
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Old 12-03-2018, 05:04 AM
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Originally Posted by PRM-RDX-3G View Post
I find the air pressure sensors are very sensitive to temperature. Mine were at 36lb. It went down to -10C in Toronto last week and they read 29lb setting off an alert. Once 20C the tire sensor readings and independent gauge settings are pretty close
It's not that the sensors are affected by temperature but the actual air pressure changes. Simply said heat causes air to expand increasing pressure, and cold causes it to contract reducing pressure. A rough rule of thumb is tire pressure will change by 1 PSI for every 10F change in temperature. Filling to 36 PSI at 70F and not adjusting seasonally will result in 30 PSI when temps get down to 10F.
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Old 12-03-2018, 07:36 AM
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Originally Posted by EFR View Post
This is the first car I have had with "advanced" TPMS, meaning the supposed actual tire pressure is displayed on the screen vs just a warning of low tire pressure. My tire's, via two seperate gauges, all show 36 lbs, which is what is called for on the door panel. The display screen on the car info screen shows all at 32 lbs. This is when tires are cold, and has been checked three times over three days. While in theory, having such exact pressure readouts available on the dash is great, if I believe the dash, they seem fairly low and need filing. If I believe the two different kinds of external gauges I use, they are fine. Has anyone else verified/compared the cars readout vs your own pressure gauges?
It's less likely that all four TPMS sensors are reading 4 PSI low. It's more likely that your pressure gauges are reading 4 PSI high. Here's some information I posted on another forum last year about this subject.

https://www.ridgelineownersclub.com/...ml#post2742921
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Old 12-03-2018, 09:37 AM
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I still do a weekly check with my "stick" gauge when the tires have been at rest for awhile since over the years that has worked for me and maybe you can't teach an old dog new tricks. The dashboard readout seems to add a psi or two to that measurement and the Acuralink maybe another psi. I don't think the small differences contribute to any road performance, improper tire wear, or safety concerns. To me the digital readouts plus the low tire pressure icon do add other sets of "eyes" especially when you take a nail and develop a slow leak between my "stick" gauge checks.
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Old 12-03-2018, 10:16 AM
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The aftermarket sensors on my OZ wheels consistently read about 3lbs. higher than a tire pressure gauge. Stock wheels with winter tires are right on with the gauge. That's on a 4G TL though.
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Old 12-05-2018, 01:39 AM
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Mines reads 3-4psi higher than manual readings. One of the very, very few things I wish was fixed.
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Old 12-05-2018, 08:26 PM
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Originally Posted by Madd Dog View Post
My dash readings are within rounding errors of measured pressures.. However, the Acuralink pressures are 2-3 pounds higher.
Originally Posted by gtssenior View Post
The dashboard readout seems to add a psi or two to that measurement and the Acuralink maybe another psi
My experience with AcuraLink on my 2016 RDX, is that the app shows the status of the vehicle when it was last turned off. For example if the door was open when you shut off the engine, then you got out and shut the door, AcuraLink will show the door opened. More info on this "Feature" is described in this previous GEN2 post.. LINK

The reason I bring this up, is that when you last turn off your RDX, it is probably when you returned home from a drive. The tire pressures will always be higher after a drive (compared to after sitting all night), and therefore AcuraLink will normally show higher pressures than what the gauge says first thing in the morning.

Another theory that I have, is that in order to increase the battery life of the sensors, they only send updated data to the car's computer, at 2-3 minute intervals. To set my tire pressure, I measure them with a gauge first thing in the morning, then I drive the car out of the garage, and I usually see the dashboard pressure update in the first 20 meters or so.

Unfortunately these theories do not explain why the OP's dashboard is "lower" than the actual pressures.

I know that tire pressure should only be set when the tires have sat overnight, but as a diagnostic test for the OP, try going for a drive around a few blocks,to give the sensors a chance to update the RDX's computer. Only then, measure your pressures with a gauge and see if they agree with the dashboard display. If they agree using this procedure, then you know there is not a mechanical problem, you just need to set your tire pressures using a gauge, and then trust your TPMS to be accurate, while in motion, after that.

Last edited by RDX-Rick; 12-05-2018 at 08:29 PM.
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Old 12-05-2018, 08:31 PM
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I update the status before I ceck it, and I still get the overage on the app.
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Old 12-05-2018, 08:40 PM
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Originally Posted by Madd Dog View Post
I update the status before I ceck it, and I still get the overage on the app.
Clicking update on the App, is just telling the App to get a new reading from the RDX's on-board computer. What I am saying is that the on-board computer will not update after the engine is turned off. Everything that was present when the engine was shut off will be sent to the App no matter how many times you press the update status button.
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Old 12-05-2018, 08:44 PM
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Originally Posted by RDX-Rick View Post
Clicking update on the App, is just telling the App to get a new reading from the RDX's on-board computer. What I am saying is that the on-board computer will not update after the engine is turned off. Everything that was present when the engine was shut off will be sent to the App no matter how many times you press the update status button.
hmmm. Didnít know that.

It does show a remote lock and unlock change though.
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Old 12-05-2018, 09:31 PM
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I've always had an issue with hand gauge -vs- TPMS because of altitude of +5400 feet in ABQ, NM. I'm usually 2-3 PSI higher on a hand gauge compared to TPMS. The pressure difference get greater as I go up in altitude. I sometimes set my PSI to 36 when I hit the ski resorts at +9000 feet with temps in the teens to keep the TPMS alarm from going off if it was set at the PSI at the door levels.
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Old 12-05-2018, 10:24 PM
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If you think you're short of air in your car, try hiking the La Luz trail or riding a bike up to Sandia Crest ( 10,650 feet ).
The really sick thing is there are people who trail run up La Luz ( 3775 feet of elevation gain in about 7.5 miles, with sustained gradients of 12%. And it's rocky. ).

Back to tire pressure, I find the TPMS readings consistent with my hand-held digital gauges.

Stick gauges tend to, well, stick.

And hand-held dial gauges are junk once they get dropped, bumped, or looked at a little funny. Not worth the trouble.
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Old 12-06-2018, 04:26 AM
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Originally Posted by EFR View Post
OK, maybe it's an A-Spec-non A-Spec thing, but mine definitely says 36 on the door. I have a digital and analog gauge that both say 36 but the dash shows 32 all the way around....hmmmm.
Probably a 20" vs 18" thing.
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Old 12-06-2018, 09:19 AM
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My tires are checked in the morning after sitting all night in my garage which stays around 48 degrees this time of year....at 550 ft altitude. For what itís worth the tires were filled with nitrogen by the dealer. I just had my winters put on my 20Ē rims by discount tire filled with Ďairí. They filled them to the correct 36 per the dash readings. I just checked them and all three of my gauges show 40. I donít know....maybe I will try a fourth reader and then give up.
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Old 12-06-2018, 01:06 PM
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Originally Posted by anoop View Post
Probably a 20" vs 18" thing.
Or 20" vs 19". My winter tires are 18" but all 2019 RDX's except A-spec come with 19" all-season tires stock, including my Advance.

But yes, lower profile tires generally have less total air volume and therefore require higher pressures to support the same weight.

It's possible that the TPMS system is reading incorrectly on OP's A-spec RDX, perhaps because it's not updating appropriately. Dunno. I couldn't find anything in the Owner's Manual about adjusting an offset for the pressures, and the
"warning" threshold would have to be different for A-spec than the other trims because of the higher recommended pressure. I wonder if this accounts for some of the complaints about harsh ride on the A-spec.

Anyone else with an A-spec who can add to the database?
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Old 12-06-2018, 01:13 PM
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Originally Posted by Wander View Post
Or 20" vs 19".
Thanks for the correction. Not sure what I was thinking when I wrote 18".
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Old 12-07-2018, 11:21 AM
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Trust the door specifications so long as you have the OEM tires supplied with the RDX. If the TPMS reading is 32 and you are reading 36 on multiple gauges, definitely take the vehicle in and ask for a check of TPMS system. Gauges do not lie, but TPMS can and does malfunction.
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Old 12-07-2018, 11:31 AM
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Go buy one of these $395 digital tire pressure gauges with the optional NIST-traceable Certificate of Calibration for an additional $130 then compare it to the TPMS and readings and report your findings.

Buxton Engineering, Inc. - Digital Tire Pressure Gauge

I bet you'll be surprised by the results.
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Old 12-09-2018, 12:43 AM
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Originally Posted by EFR View Post
OK, maybe it's an A-Spec-non A-Spec thing, but mine definitely says 36 on the door. I have a digital and analog gauge that both say 36 but the dash shows 32 all the way around....hmmmm.
My Advance has 33 on the door. As for discrepancy between the dash and standalone gauges, try to check on the Acura Link app the ďstatusĒ data. That could give you a ďsecond opinionĒ on the accuracy of dash numbers. I presume that app reads data directly from the sensor interface.
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Old 12-09-2018, 07:12 AM
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Originally Posted by mechonit View Post
...I presume that app reads data directly from the sensor interface.
Probably not - no way for the app to directly access the sensors since all it has is an indirect link to the vehicle (I suspect through a Honda/Acura server somewhere). It just asks the car for the information and displays whatever is returned. It's not a particularly smart bit of code.
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