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TPMS sensors acting up

Posted: Sat Jan 11, 2020 9:36 pm
by srl99
I don't drive the car much ('19 Clarity EV), but that shouldn't be the cause. I have an indication that tire pressureS are low. I went to Costco where
they used their digital gauge to fill the tires to the placard pressure (inside driver's door). I still have the indication. Rather not waste time w the
dealer, should I do the "recalibrate TPMS" from the set-up panel? Would that solve the problem?

I guess I could have Costco bring out their TPMS reader, which would still be less hassle than dropping off at the dealer.

Re: TPMS sensors acting up

Posted: Sun Jan 12, 2020 4:45 am
by DucRider
Yes, you should most definitely do the TPMS calibration. The Clarity doesn't actually use pressure sensors, but instead looks at speed differential between the various wheels to detect a tire with a lower pressure (and therefore smaller diameter).
If you take it to the dealer, they will do the same TPMS reset available to you.

It can take a few miles for the warning to go away after a rest.

Our Fit EV (which used the same system) had an issue within a few days of new that required the dealer to electronically poke the system to get it to respond. If the recalibration does not work, then it will likely be a trip to the dealer

Re: TPMS sensors acting up

Posted: Sun Jan 12, 2020 3:17 pm
by srl99
Thank you! Also, I read this (rather late) in the online manual:
TPMS Calibration
Any time you inflate, change, or rotate one or more of the tires, you need to recalibrate the system. The calibration process requires approximately 30 minutes of cumulative driving at speeds between 30-65 mph (48-105 km/h). The vehicle must be stopped to begin calibration, and the process finishes automatically.

Use the touchscreen to make and enter selections.

From the HOME screen, select Settings.
Select Vehicle.
Select TPMS Calibration.
Select Calibrate.

BTW in over 50K miles in the Fit EV, I never had trouble w TPMS - there may have been a few days when the tire pressure was actually low, but I filled the tires, and all was well.

Re: TPMS sensors acting up

Posted: Wed Jan 22, 2020 1:18 am
by Pyxilady
I had something weird happen with my 2018 Clarity's TPMS recently. I've been bad: haven't personally checked the tire pressure since I bought the car a year ago (but it was serviced 2 months ago at the dealer, and it also went in for a stone jammed in the wheel, so they would have checked then too, I assume). Like many women, I wait for the TPMS to tell me there is an issue before doing this.

So I was cruzing on the highway, and after about 40 mins of driving, the TMPS warning light went on. I stopped at a garage to get air, but the gage on the air-machine said the tires were well over 40 psi (door says 36 is needed). I was baffled; was their air gage wrong, or what? So I stopped at a Honda dealer and asked them to check the inflation of the tires, and they confirmed the pressure was *too high (around 44 psi)*, and corrected it. Since the only people who had ever put air in my tires were the Open Road Honda folks, this really got me concerned. So, I guess, if there is some sort of auto-calibrate, then I should speak to the dealer about this issue? Why were my tires so (dangerously?) over-inflated?

Re: TPMS sensors acting up

Posted: Thu Jan 23, 2020 1:08 am
by DucRider
Pyxilady wrote:
Wed Jan 22, 2020 1:18 am
I had something weird happen with my 2018 Clarity's TPMS recently. I've been bad: haven't personally checked the tire pressure since I bought the car a year ago (but it was serviced 2 months ago at the dealer, and it also went in for a stone jammed in the wheel, so they would have checked then too, I assume). Like many women, I wait for the TPMS to tell me there is an issue before doing this.

So I was cruzing on the highway, and after about 40 mins of driving, the TMPS warning light went on. I stopped at a garage to get air, but the gage on the air-machine said the tires were well over 40 psi (door says 36 is needed). I was baffled; was their air gage wrong, or what? So I stopped at a Honda dealer and asked them to check the inflation of the tires, and they confirmed the pressure was *too high (around 44 psi)*, and corrected it. Since the only people who had ever put air in my tires were the Open Road Honda folks, this really got me concerned. So, I guess, if there is some sort of auto-calibrate, then I should speak to the dealer about this issue? Why were my tires so (dangerously?) over-inflated?
Sometimes people will always run their tires at the maximum pressure listed on the sidewall instead of the pressure recommended by the auto manufacturer. This is done with the theory that it is more efficient (less rolling resistance). There may be a small gain in that regard, but ride quality and traction will suffer. It is possible that whomever filled your tires for you thought they were doing you a favor.
There have also been reports of brand new Clarity's delivered with 50 psi in the tires. Reportedly that is how they are shipped from thr factory abd the dealer is supposed to adjust them as part of the pre-delivery procedure.

It is a good idea to occasionally check your tire pressures. As stated above, the Clairty does not actually monitor the pressure in the tires, only looks for signs that one is lower due to a rotational speed difference (as a tire loses air it becomes smaller in diameter and be spinning faster)

Re: TPMS sensors acting up

Posted: Thu Jan 23, 2020 4:26 am
by jzchen
If you don't check the tire pressures, the service technician probably noticed how low they'd become and pumped them high to account for that. It is safer to go higher than it is to drop lower than recommended. In fact some sports cars have a higher pressure to set tires to if going above 100 MPH as an example.

Re: TPMS sensors acting up

Posted: Mon Jan 27, 2020 6:28 am
by darthpuppy
I have to say the TPMS worked well for me. I was driving along and it reported an issue. I pulled over and noted that one tire was going down. I was a block from a car parts store so I hobbled over there and got a fix a flat kit, which worked fine. I've since replaced the tire. Glad the TPMS worked as intended as I was about to embark on a long drive with few good stop/service opportunities.