[aprilhilliard25]

Hi so I was driving home one rainy stormy night and came up on a vehicle with their lights on high beam as if they were deer hunting. I slammed brakes cause I couldn't see and I hit a curb really hard. It blew my front passenger tire right then and there also there was a huge bubble in my back passenger tire. Changed front tire that night got up purchased tire for the bubbled tire and every since my psi light has been on. This was a month ago 3 tires read 34 psi as they should and the tired that replaced the bubbled tire can be 39 but before two hours it's on 19. Took it to dealership they did the horn beep sound on all tires they say it's fine and they just add air then it's gone within 2 hours from 39 to 19 .A friend said my sensor isn't reading it or something he said the dealership should have let all the air out the tire and refilled it. I been to dealership like 6 times already it's the same thing check all tires add air now my dash reads its on 9 what is going on????chevy malibu 2017 ls

 

[campb292]

You hit a curb and damaged the tires from impact. You replaced the tires. From your description the car's pressure readings show substantial loss of air in that one tire. They keep adding air to that tire then it leaks again. Have you personally confirmed with a pressure gauge that loss of air?

 

[aprilhilliard25]

I told the guy at the dealership the same thing I texted and they only check all the tires with the pressure gauge and fill that one tire with air. They say the see no cuts or holes in the tire. I have a tire gauge thing in the trunk but I don't know what I'm looking for when using it so I don't that's why I go to the dealership.

 

[DrivenDaily]

1. Remove cap from valve stem
2. Use gauge to measure the air pressure
3. What is the reading?

 

[campb292]

Gauge styles vary. You just remove the cap then press the gauge onto the valve stem so you don't hear any air hissing/escaping to get a reading. What this is trying to do is confirm the loss of air the car is reporting. If the tire is consistently losing air they need to either replace the tire under the manufacturer warranty or repair it. On a new tire it would probably be a defect or leaking valve stem if the wheel is ok. If the tire isn't actually losing air the problem is the sensor. The dealer should be sorting this out for you but as with all things, many areas of society suffer from severe lack of expertise and/or apathy.

A quick video showing how to check tire pressure:

 

[aprilhilliard25]

Thanks I will have my friend to do this today thanks for the video also

 

[JTR19]

As others have stated, you need to check the pressure with an appropriate tire gauge to compare to what your driver information center (DIC) is telling you.
If you struck a curb, there could be a couple things that are happening here.
1) You bent or cracked the wheel. If the bead of the wheel was bent, the tire may not be sealing against the wheel in that area and air is escaping there. Or the wheel could be cracked and air is escaping through the crack. For either of these situations a new wheel would be needed. If you had the tire replaced and the shop that did the replacement did not show you the damage to the wheel and advise you that the wheel should be replaced then you should leave that shop a bad review.
2) The other possibility is that when the wheel struck the curb you may have damaged the TPMS sensor (Tire Pressure Monitoring System). On the outside of the tire the valve stem looks like any automotive stem that's been used for the last 80 years on car and truck tires. But since late 2007 all new cars have come with TPMS systems and the valve has a pressure sensor on it on the inside of the wheel. They look something like these pictures:

If using a tire pressure gauge shows that the tire is in fact holding pressure and is not deflating as the DIC is telling you, then likely the TPMS sensor on that wheel needs to be replaced.

 

[aprilhilliard25]

Thanks my friend did the air gauge check from first video in comments and he said it's reading 34. He said it's something else the tire is good so now I'm going to go to dealership show them this Tpms info and let them go ahead and pretend to know what the problem is charge me 400 for a new tire.i just figured the front tire and rim would give me the most problems since that hit was really hard but the fronts fine the back had a bubble and it's driving me crazy. Thanks for the info.

 

[aprilhilliard25]

1. Remove cap from valve stem
2. Use gauge to measure the air pressure
3. What is the reading?

It read 34 .......

 

[campb292]

Thanks my friend did the air gauge check from first video in comments and he said it's reading 34. He said it's something else the tire is good so now I'm going to go to dealership show them this Tpms info and let them go ahead and pretend to know what the problem is charge me 400 for a new tire.i just figured the front tire and rim would give me the most problems since that hit was really hard but the fronts fine the back had a bubble and it's driving me crazy. Thanks for the info.

It read 34 .......

Nobody should be charging you for a new tire even if the problem was the tire you just purchased. Nor should a single tire for a 2017 LS be $400 even if you needed one. Slow down and think carefully about how to proceed.

Based on what you have written, you replaced a tire due to damage. You have now used a gauge to check the air in that tire and it was holding at 34 psi. Previously you had written that tire was dropping to 19 in just a couple hours according to the car's instrument panel. The physical check you have done is accurate. The reading in the car is what is wrong. As I and JTR19 wrote, that is most likely a sensor issue. It could be damaged from the impact. You don't need a new tire - the sensor is sold separately from the tire.

 

[aprilhilliard25]

Yeah the tire is fine they see no holes they hear no seeping air. So I know if I go to my dealership they are going to still charge a high price. I know nothing about cars certainly not sensors so do I order the sensor online get it from auto zone etc....then take it to the dealership or do I just take my car to dealership and let them do everything.

 

[repairman54]

The tire sensor requires the tire to be removed from the car and the tire has to be taken off the rim to change the sensor as the sensor is on the inside of the valve where you add air to the tire. The factory tire sensors are better quality than what AZ sells. You still need a shop to do the work.
In my area the tire shops are not that great, I use my dealer as they will price match tires and do not damage my rims like the local hacks do.

 

[aprilhilliard25]

Thanks to the dealership it is

 

[555hp]

Hi so I was driving home one rainy stormy night and came up on a vehicle with their lights on high beam as if they were deer hunting. I slammed brakes cause I couldn't see and I hit a curb really hard. It blew my front passenger tire right then and there also there was a huge bubble in my back passenger tire. Changed front tire that night got up purchased tire for the bubbled tire and every since my psi light has been on. This was a month ago 3 tires read 34 psi as they should and the tired that replaced the bubbled tire can be 39 but before two hours it's on 19. Took it to dealership they did the horn beep sound on all tires they say it's fine and they just add air then it's gone within 2 hours from 39 to 19 .A friend said my sensor isn't reading it or something he said the dealership should have let all the air out the tire and refilled it. I been to dealership like 6 times already it's the same thing check all tires add air now my dash reads its on 9 what is going on????chevy malibu 2017 ls

An impact that it hard enough to bubble the tire is hard enough to break a sensor in the TPMS module inside the tire.

 

[sharonhumburg2022]

I have never been charged to reset the sensor. It's a very easy thing for them to do. Also most tire shops will do it as well

 

[aprilhilliard25]

An impact that it hard enough to bubble the tire is hard enough to break a sensor in the TPMS module inside the tire.

Front tire completely flatten from impact and the back tire had a huge bubble or knot or whatever it's called but yeah I assume the back tire scrapped the curb idk I just know front flatten on impact and I was told to go to tire shop the next day to remove bubbled tire.

 

[aprilhilliard25]

I have never been charged to reset the sensor. It's a very easy thing for them to do. Also most tire shops will do it as well

So are they just going to reset the sensor or will they have to completely remove it

 

[allyc1311]

Sounds like they aren’t updating your tire pressure sensors. I had this same issue kept taking my vehicle back and finally a mechanic friend of mine explained they need to adjust the tire pressure sensors or make sure when programming they use the right model with or without TPS. Mine is currently reverse and backwards most places only rotate or replace the tire and skip over the sensor update unless asked.

Hi so I was driving home one rainy stormy night and came up on a vehicle with their lights on high beam as if they were deer hunting. I slammed brakes cause I couldn't see and I hit a curb really hard. It blew my front passenger tire right then and there also there was a huge bubble in my back passenger tire. Changed front tire that night got up purchased tire for the bubbled tire and every since my psi light has been on. This was a month ago 3 tires read 34 psi as they should and the tired that replaced the bubbled tire can be 39 but before two hours it's on 19. Took it to dealership they did the horn beep sound on all tires they say it's fine and they just add air then it's gone within 2 hours from 39 to 19 .A friend said my sensor isn't reading it or something he said the dealership should have let all the air out the tire and refilled it. I been to dealership like 6 times already it's the same thing check all tires add air now my dash reads its on 9 what is going on????chevy malibu 2017 ls

 

[JTR19]

Sounds like they aren’t updating your tire pressure sensors. I had this same issue kept taking my vehicle back and finally a mechanic friend of mine explained they need to adjust the tire pressure sensors or make sure when programming they use the right model with or without TPS. Mine is currently reverse and backwards most places only rotate or replace the tire and skip over the sensor update unless asked.

I'm sorry, but no.
She hit a curb and damaged two of her tires. Now one of those wheels is reporting low pressure when she has verified that the tire has the correct pressure in it. That means that the TPMS sensor needs to be replaced.

What you are speaking of is if tires get rotated without resetting their positions in the BCM, then your DIC may tell you that you have low pressure in the rear DS tire, and when you check the pressure in all tires you find that the front PS tire is the one that is actually low. That is not the situation here.

 

[JTR19]

So are they just going to reset the sensor or will they have to completely remove it

April, where ever you take your car they will have to partially remove the tire (break the bead and dismount the outside edge of the tire from the rim) and replace the TPMS sensor & valve. Those are always a complete unit like the pictures I included above, the sensor is not a seperate item that can be replaced by itself.