Tire Pressure Indicator Issue

First 30 psia is a little low...possibly that is low enough to set off the warning light. I'd try putting more pressure in the tires and hitting the RESET button.

Otherwise, you might have lost a battery in one of the TPMS sensors, which requires a new TPMS sensor inside the tire, or live with the warning light as many do. Mine lasted 9 years but yours could be shorter life especially if you put a lot of miles on.

 

If the light blinks for one minute, then stays on solid, it means that one or more sensors are not being picked up (e.g. dead sensor battery), or some other system malfunction. My 2012 as had sporadic problems the past year with warnings while the pressures are good (both summer and winter wheel sets), but not frequently enough for me to track down the issue. At least the new ScanGauge firmware tells me which sensor is not reading, and I think it corresponds to my right-front wheel on this summer set. Hasn't repeated on the winter set since that firmware upgrade.

If a tire is actually reading low, I'm not sure if it blinks continually, or stays solid from the start. But it should be different than the above pattern.

That is too low for 15" wheels. I don't recall the recommended pressure for 17", but didn't think they were that low either.

 

30 PSI would give you unresponsive handling, outer edge tire wear as well as poor MPG. I run mine at 42/40 and for many here that is low. Even my wife's plushmobile at 36.

 

Where are you getting the information for how it should be? I think the placard on your door jamb probably says 35 in front and 33 rear, doesn't it?

30 is probably not low enough to trigger the warning light, but once the warning light is triggered, you'll need to go higher than that before it will go out. So if there was an especially cool day and the pressures went a little lower, enough to trigger the light, then it warmed a bit and now they show 30, you'll still have the light. Just air the tires back up to the correct 35 and 33 or so, and it should go out after a bit of driving.

This is assuming you have nothing else wrong with the system. Normal behavior is the light comes on for six seconds when you turn the car on, then goes out, then comes back on steady if you have a low pressure warning. Is that what's happening (what you called blinking when you start the car)?

The SET button under the dash shouldn't be anything you would normally futz with. Its only purpose is to change the pressure limit programmed into the system for the warning. If the programmed limit is right, there's nothing to gain by pushing the button.

-Chap

 

Someone knows some application to measure the pressure of the tires by bluetooth?

Posted via the PriusChat mobile app.

 

Tire assistant Tire Assistant
Works on Android. Tire Assistant - Apps on Google Play

 

Carista does as well...

 

Ok thanks you,I will try it


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you have carista or carista pro?

Posted via the PriusChat mobile app.

 

I have same issue. This started about 2 weeks after a t bone on my left rear quarterdoo\panel area. I mentioned it too the adjuster but he said they will address when car is fixed. lts the prius is a 2010 with 187K and the damamge although cosmetic didnt affect driving. I de rather save the settlement to put toward a new car in the future. I've take it to two shops that used a device to check all 4 tires and it passes as in the tire sensors seem to be working. I always keep my tires between 37 to 40psi. I recently had a flat that I couldnt tell right away so not sure how to fix this once and for all. What else could it be. Early on I did press the reset button under the dash but maybe this model needs a certain method \routine. Does anyone know?

 

42 in the front and 38 in the back.....................

 

The more people who know that isn't a reset button, the better. The button is there to tell the car to save the current pressures in the tires as being the pressures you want, so it will light the warning light when the pressure drops a certain % below that. So, it is useful if you change your mind about what tire pressures you want. It's also useful if you run different pressures front and rear, and then you rotate the tires (because the car remembers the set pressures according to which tire transmitter, not which corner of the car).

 

The manual does call it a Reset which adjusts the monitored pressures - but it does not clear a blinking error. A blinking tpms light at startup indicates at least one sensor is not detected, generally caused by a bad sensor battery.

Replacing a sensor requires writing the new sensor's unique serial number into the system, typically with Techstream or a dedicated TPMS handheld device using the OBD2 port.

Aftermarket sensors will work. I recently replaced mine for $36 plus installation at a tire shop.

https://www.amazon.com/gp/aw/d/B0B4KBJLP3?psc=1&ref=ppx_pop_mob_b_asin_title

From the owners manual

 

Well, yeah, the English translated text next to the picture says to "press and hold the ... reset switch", while the switch itself is labeled SET, which is a better fit for what it does.

The point is for people to know that what it does is set the tire pressures you want. A lot of people, when they see the word 'reset', assume it does more than that, and start trying to solve problems with it.

The problem you can solve with it is when the tire pressures you want are different from the ones it's set for.

 

I took it to 2 tire places and they used the tester and both times all the sensors were active. So dont know what to do next

 

One of them is too weak to be read by the single tpms antenna. Scanning the car will tell you which serial number.

In this case sensor 2 was not being received

 

so do they need to hook up a scanner under the dash? They had a scanner that they used and walked around to eac tire and got green ok on all 4

 

Yes the obd2

 

The walk-around to each tire determined that all the sensors are working and talking. Now you need to hook up a scanner to the under-dash OBDII port to find out which sensors the car is or is not hearing.