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Old 09-24-2013, 05:37 PM
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TPMS and dealer inflation policies

The 2014 Overland I test drove was set at 43 psi cold. The one I ended up buying was also set at 43 psi cold. Talked to a service advisor and he said it must have been a mistake. They reset the tires to 36 psi and I was on my way.

Came in for a transmission flash and left with tires set at 43 psi. Starting to look like a pattern developing.

Yesterday we had a significant temp drop and my wife's 2012 Suburu Outback's TPMS went off. I checked the tires and they were within 1lb. of the door sticker. Pumped them up to spec but the light stayed on. Needed an oil change and went in and also asked them to look at the sensor. Picked it up and they said the tires were low and that they filled them to 36 psi. I pointed out that 36 was 4 and 6 lbs. respectively higher than the door plate and the service guy said they needed to stay at 36 to keep the TPMS quiet.

Two different dealers servicing for two different manufacturers seem to be setting tire pressures above their manufacturer's spec in order to avoid TPMS warnings. Why don't the manufacturers simply refine the TPMS to operate within their own recommended pressures?
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Old 09-24-2013, 07:14 PM
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Re: TPMS and dealer inflation policies

The TPMS on my car only watches for drops in pressure and has a "reset" function to tell it that the current pressure is its target. I put all the tires at the right pressure, do the reset, and drive a few feet until it's registered. I haven't yet owned anything else with TPMS, so I just assumed that they all had something like that....
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Old 09-24-2013, 07:29 PM
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Re: TPMS and dealer inflation policies

When the temp gets colder outside the pressure in the tires drop. When the tires get hot in the summer the pressure goes up. You just need to adjust to the outside temps.

http://www.google.com/url?sa=t&rct=j...dTAltS_xh0clng

http://www.google.com/url?sa=t&rct=j...nB_cUD4Ie-od7A
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Old 09-24-2013, 07:51 PM
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Re: TPMS and dealer inflation policies

I understand how TPMS works and that tire pressure changes with ambient air temperature changes. My point was that dealers appear to be over inflating tires in order to avoid having to deal with TPMS sensors going off.

Doesn't seem like a good thing. If the builder says 36 psi, over inflating as a convenience to the service department runs a risk of premature center tread wear.
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Old 09-24-2013, 08:10 PM
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Re: TPMS and dealer inflation policies

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Originally Posted by Bborzell View Post
I understand how TPMS works and that tire pressure changes with ambient air temperature changes. My point was that dealers appear to be over inflating tires in order to avoid having to deal with TPMS sensors going off.

Doesn't seem like a good thing. If the builder says 36 psi, over inflating as a convenience to the service department runs a risk of premature center tread wear.
True. Every time I get home from a dealer appointment I need to let air out of my tires. I have 18" with door sticker 33 lbs. at 60F degrees. They usually come home at 40 lbs. +/-.

We are starting to get 60F degree mornings now so I will run at 35 lbs. going into winter soon which should keep me at 33lbs. down to about 40F degrees.
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Old 09-25-2013, 05:24 PM
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Re: TPMS and dealer inflation policies

I know when I had my BMW M3, every time I had a service done, even though I kept 38psi in the 19" tires, the dealer would always set it to the BMW recommended 36psi. My Jeep dealer doesn't check them which is fine with me since I check them weekly.
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Old 09-25-2013, 09:49 PM
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Re: TPMS and dealer inflation policies

Are you going by a good gauge, measuring when tire is cold (like overnight cold) or by the TPMS?

The TPMS is a good 3-4LBS off on my car.

I would not set my pressure by the TPMS.
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Old 09-25-2013, 10:33 PM
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Re: TPMS and dealer inflation policies

I have several good gauges, and my TPMS matches them within a pound every time I check. I must have gotten a well calibrated set of sensors.
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Old 09-26-2013, 06:49 AM
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Re: TPMS and dealer inflation policies

My right front tire always reads 1 pound higher than my gauge. Since I air down at least once a week for driving on the beach I wind up checking them a lot ... but that's OK

My Jeep came with the tires way over inflated, with each tire at a different pressure. Since then I get the car back the same as I bring it in. Either they're very attentive at this dealership (not where I bought it) or they don't check them at all.

My Acura came with the tires set to max pressure as indicated on the tire. I questioned that and was told they are supposed to set it per the door jamb sticker. Every time I picked the car up they were back to max. I started telling them not to wash it and not to check the tires.



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Old 09-26-2013, 07:13 AM
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Re: TPMS and dealer inflation policies

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Originally Posted by mswlogo View Post
Are you going by a good gauge, measuring when tire is cold (like overnight cold) or by the TPMS?

The TPMS is a good 3-4LBS off on my car.

I would not set my pressure by the TPMS.
I use a high quality digital gauge. But, for this discussion, I am not considering the TPMS reading as the final number, only an indication that I might want to check the actual pressure in each tire myself. In my case, the TPMS is within 1 psi of my digital gauge.

I m actually going by conversations with service folks. Both dealerships are routinely over inflating and one was willing to relate that it is common practice at service bays (in California, techs are apparently required to inflate tires in accordance with the door sticker with every service), to over inflate in order to reduce the incidence of TPMS alerts going off.

They also tell owners to stick with the psi on the door sticker. It's a bit like living in an alternate reality.
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Old 09-26-2013, 10:50 AM
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Re: TPMS and dealer inflation policies

Quote:
Originally Posted by Bborzell View Post
I use a high quality digital gauge. But, for this discussion, I am not considering the TPMS reading as the final number, only an indication that I might want to check the actual pressure in each tire myself. In my case, the TPMS is within 1 psi of my digital gauge.

I m actually going by conversations with service folks. Both dealerships are routinely over inflating and one was willing to relate that it is common practice at service bays (in California, techs are apparently required to inflate tires in accordance with the door sticker with every service), to over inflate in order to reduce the incidence of TPMS alerts going off.

They also tell owners to stick with the psi on the door sticker. It's a bit like living in an alternate reality.
I was surprised how many folks use the Max pressure on the Tire for their pressure instead of the door tag.

I have an in law that owns a Rental Store. Very sharp guy. He was inflating tires on something and I thought it seemed awful high. He was using what was on the Tire. I told him about the Door Tag, he said no way !!

When I was young (16) and didn't know any better I used to do that. Maybe that was the way back then.

The TPMS should have an over pressure warning too. Don't think it does.
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Old 10-01-2013, 12:06 PM
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Re: TPMS and dealer inflation policies

On the tire is the max. pressure at the max. load capacity.
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