TPMS Reading doesn't match gauge.
Thread Starter
Racer
Joined: Aug 2011
Posts: 281
Likes: 24
From: Displaced New Yorker living in Denver
TPMS Reading doesn't match gauge.
Yesterday the dealer replaced my 2009 TL SH-AWD Tech 18” tires with brand new factory tires, it was a CPO and they agreed to give me new tires as the tread was below 5/32 when I bought it.
Today, after letting the car sit overnight, I decided to look at the TPMS screen. I noticed that the TPMS stated that the driver’s side tires were both at 30, and the passenger’s side were both at 32. I got out my gauge, and the drivers sides both measured at 33, and the passenger’s side at 35. I tried another gauge, same readings as the first one. I let some air out of the passenger’s side, so they are all at exactly 33 right now according to both gauges. The door sticker recommends 32, but I figured 1PSI higher couldn’t hurt. This is all with the car sitting overnight, and it has not been started or driven. It’s about 42F right now outside, car is outside.
I get back in the car, and the TPMS now says 30 all around. Why would the TPMS be 3PSI low? It seems to be pretty accurate in its movement, however exactly 3PSI off. Is there a way to reset it? It’s unlikely that both of my gauges are incorrect by the exact same amount? If it’s just always going to be 3psi low I can live with that, just as long as I am aware. I also hope it doesn’t warn me prematurely if the tires are low, but I am pretty religious about checking my tire pressure.
Today, after letting the car sit overnight, I decided to look at the TPMS screen. I noticed that the TPMS stated that the driver’s side tires were both at 30, and the passenger’s side were both at 32. I got out my gauge, and the drivers sides both measured at 33, and the passenger’s side at 35. I tried another gauge, same readings as the first one. I let some air out of the passenger’s side, so they are all at exactly 33 right now according to both gauges. The door sticker recommends 32, but I figured 1PSI higher couldn’t hurt. This is all with the car sitting overnight, and it has not been started or driven. It’s about 42F right now outside, car is outside.
I get back in the car, and the TPMS now says 30 all around. Why would the TPMS be 3PSI low? It seems to be pretty accurate in its movement, however exactly 3PSI off. Is there a way to reset it? It’s unlikely that both of my gauges are incorrect by the exact same amount? If it’s just always going to be 3psi low I can live with that, just as long as I am aware. I also hope it doesn’t warn me prematurely if the tires are low, but I am pretty religious about checking my tire pressure.
Cruisin'
Joined: Sep 2011
Posts: 21
Likes: 4
Here's what the owners manual says about it hope it helps,
When the low tire pressure/TPMS
indicator is on, one or more of your
tires is significantly underinflated.
You should stop and check your
tires as soon as possible, and inflate
them to the proper pressure
as indicated on the vehicle’s tire
information placard.
Each tire has its own pressure
sensor (not including the spare tire).
If the air pressure of a tire becomes
significantly low, the sensor in that
tire immediately sends a signal that
causes the low tire pressure/TPMS
indicator in the instrument panel to
come on. If this happens, you will see
which tire is losing pressure on the
multi-information display along with
a ‘‘CHECK TIRE PRESSURE’’
message.
It is possible that the pressures
shown on the multi-information
display and the pressures you
manually measure are slightly
different.
If the difference is significant or you
cannot make the low tire pressure/
TPMS indicator and message on the
multi-information display go out after
inflating the tires to the specified
values, have your dealer check the
system as soon as possibleindicator is on, one or more of your
tires is significantly underinflated.
You should stop and check your
tires as soon as possible, and inflate
them to the proper pressure
as indicated on the vehicle’s tire
information placard.
Each tire has its own pressure
sensor (not including the spare tire).
If the air pressure of a tire becomes
significantly low, the sensor in that
tire immediately sends a signal that
causes the low tire pressure/TPMS
indicator in the instrument panel to
come on. If this happens, you will see
which tire is losing pressure on the
multi-information display along with
a ‘‘CHECK TIRE PRESSURE’’
message.
It is possible that the pressures
shown on the multi-information
display and the pressures you
manually measure are slightly
different.
If the difference is significant or you
cannot make the low tire pressure/
TPMS indicator and message on the
multi-information display go out after
inflating the tires to the specified
values, have your dealer check the
AZ Community Team
Joined: May 2007
Posts: 32,488
Likes: 7,771
From: N35°03'16.75", W 080°51'0.9"
It seems to be fairly common for TPMS to +- about 2 psi from a manual guage. 3 psi is a bit more than most posts I've seen. Some are right on.
I know, compared to my guage that 3 of the sensors match and one is ~0.5 psi off. I have no problem with that.
In your case, imho, the easiest thing to do is just account mentally for the 3 psi and use the TMPS display as a reference for when your tires need air or, potentially, have a problem.
I know, compared to my guage that 3 of the sensors match and one is ~0.5 psi off. I have no problem with that.
In your case, imho, the easiest thing to do is just account mentally for the 3 psi and use the TMPS display as a reference for when your tires need air or, potentially, have a problem.
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