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Old 07-21-2019, 10:07 AM
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Low Tire Pressure Light

Seems everytime I add something new, something breaks.


Just put new set of BFG KO2's on the 2010 JK and after about a day of driving the Low Tire Light came on. After starting the Jeep, it beeps and blinks about 75 times which is about 70 seconds or so. I read that could be a sign of a sensor but I didn't have any issues with previous tires.



Tires looked fine. Next morning checked pressure cold and all were about 38-39 pounds. A couple were closer to 40. I backed those off a bit to see if it was maybe too much but so far it says lit but haven't give it enough driving time yet.


It is going back to the dealer next week for a EVAP Solenoid (another light)



Thoughts?

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Old 07-21-2019, 10:20 AM   #2
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New tires shouldn't have caused this, I would be skeptical on what the shop did to affect this.

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Old 07-21-2019, 11:08 AM
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I would agree. Seems strange after two dealership visits I now have two different warning light issues.
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Old 07-21-2019, 05:42 PM   #4
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My 2013 only flashed the warning once, after having a tire repaired. Turned out the shop had damaged the TPS inside one wheel. Whenever I air down my tires, the lamp is on steady, and shows all the tire pressures on the dash indicator.


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Old 07-21-2019, 06:11 PM   #5
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Are your sensors original?
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Old 07-21-2019, 07:11 PM   #6
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There is a app with the wireless OBD2 sensor that can disable the stupid system.
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Old 07-21-2019, 08:48 PM
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I put the tires on different rims that are new to me but quite old and I don’t know if the dealership put new sensors in them or not so I guess it’s possible they are bad
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Old 07-22-2019, 09:34 AM
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So the rims I had them put the new tires on were given to me. I found they came from a Jeep Grand Cherokee. Each rim had a date written on the inside (2008). Could the issue be the sensors on these rims are not compatible with the JK? I suppose the batteries could all be dead. What a pain, they will have to remove all the tires again to replace those.
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Old 07-22-2019, 09:57 AM   #9
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Do some research and find out which sensors are in the 'new to you wheels' from the Cherokee. It is more than likely they are incompatible with your TPMS. However, you could have one or more bad sensors. I would never put old sensors in new tires/wheels more than 3 years old based on experience from multiple vehicles with TPMS i've owned.
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Old 07-22-2019, 10:28 AM
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Heck, I didn't even know there were sensors in the tire. You would have thought the dealership would have said something or recommended changing them.
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Old 07-22-2019, 10:54 AM   #11
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You can buy a set of sensors fairly cheaply, but be careful about how cheap they are. Sensors that are really cheap may be a great deal or they may not work. Sensors that won't work are not a very good deal at any price.
Reputable vendors sell replacement sensors for $40 each or less.
There are two versions, with two different frequencies used. I believe it was around 2012 when Jeep switched frequencies, but don't quote me on that. Get a set of new sensors that are the right frequency for your year Jeep and have them installed. I think it is likely that while the wheels you acquired had the right frequency sensors you required they were likely too old and at least one likely had a dead battery.
Another option is a widget or an app that will allow you to turn the TPMS system off. Personally, I like the system, but I have a widget that lets me adjust the pressure the system triggers at. If you go with an app you also need an OBD2 widget. If you get a widget you need nothing else, but the widgets tend to cost more than the apps. To each their own.

Also, what size are your tires? Most run around 35 to 37 psi on the stock tire sizes and for larger tires you run lower psi (often down to 30 psi or less).
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Old 07-22-2019, 11:03 AM
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Also, what size are your tires? Most run around 35 to 37 psi on the stock tire sizes and for larger tires you run lower psi (often down to 30 psi or less).

BFG A/T KO2 255/75R17. They appear to be set at around 38 or 39 psi according to my pressure gauge. They were pretty close to 40 and I backed them down a bit thinking maybe they were too high. Is going in the shop again tomorrow so we'll see what they say. I may be looking at one of those Procal's or something.
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Old 07-22-2019, 11:26 AM   #13
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BFG A/T KO2 255/75R17. They appear to be set at around 38 or 39 psi according to my pressure gauge. They were pretty close to 40 and I backed them down a bit thinking maybe they were too high. Is going in the shop again tomorrow so we'll see what they say. I may be looking at one of those Procal's or something.
The issue you have with your TPMS light is not because of too high a pressure in your tires. But you will likely find that your Jeep rides much better with pressures at 35 psi or less.
Personally I like the TPMS system, and I especially like the versions that show you the individual pressures in your tires. I don't understand why someone would want to turn the system off. Sure, I can check the pressures manually with a gauge, and occasionally I do just that. But the systems is there every day, every time I drive the vehicle, making sure that the tire pressures are not low. What is not to like? But to each their own.
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Old 07-22-2019, 01:18 PM
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I need to get a digital gauge.


Dealership just called and said my new/used rims don't have any sensors. Thats my problem. Looks like I'm going to need to order new ones but they are checking on compatibility with stems for those rims. Crazy
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Old 07-22-2019, 02:10 PM
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Update. Dealership said there were no sensors in new rims. New sensors (68406530AA) would be 109.99 each + 218 labor for a total about $849. Yikes. Maybe I'll find my own sensors and have someone else install them later. They did offer to use the ones in my old rims but I already sold them.
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Old 07-22-2019, 02:48 PM   #16
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Update. Dealership said there were no sensors in new rims. New sensors (68406530AA) would be 109.99 each + 218 labor for a total about $849. Yikes. Maybe I'll find my own sensors and have someone else install them later. They did offer to use the ones in my old rims but I already sold them.
As I mentioned, you can buy TPMS sensors for around $40 each from quality vendors. You can find them cheaper, but be careful. Some deals are too good to be true.
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Old 07-22-2019, 04:11 PM
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Like the Oro-Tek on Extreme Terrain. $24.99 seems too good to be true but there are good reviews.
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Old 07-25-2019, 09:51 AM
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Ok. I'm probably over thinking this but I want to be sure as its a ton of work and expense to install sensors. I did order a device to turn the light off for now but I eventually want to get these working properly.



The wheels I put on my jeep are 17" 2007 Jeep Grand Cherokee Wheel Bright Chrome Clad (ALY9054U86 ). I don't think they had sensors back when these rims were made.
Does that make a difference? Do the stems have different sizes.



My dealership said I needed OEM 68406530AA. I have read where others use aftermarket from ebay and other sources. I want to be sure they will work.



I'm assuming I need to buy sensors for my 2012 JK so the frequency will work but do I need to worry about rim compatibility?
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Old 07-25-2019, 10:26 AM   #19
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Go to Discount Tire and get the sensors ---- they sell good ones and warranty them & the labor.
Never ever ever go to a dealer for tire work. Ever. Never ever.
They can't balance a big tire to save their lives, they use impact guns to mount them rather than a torque wrench, and they charge criminal amounts of cheese to do it.


Never.
Ever.
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Old 07-25-2019, 11:10 AM   #20
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Like the Oro-Tek on Extreme Terrain. $24.99 seems too good to be true but there are good reviews.
That is a good price. And there is nothing wrong with that brand of sensor, as long as they are the right frequency for your Jeep. There are two different frequencies used in modern Jeeps.
As mentioned, I would just take it to a shop like Discount Tire and let them sort it out. But if you want to supply your own sensors that would be a good sensor to go with (as long as it is the right version). But if the shop breaks one of your supplied sensors are they going to replace it? Don't assume they will.
And I totally agree, don't go to the dealer for tires. They will screw it up. Dealers are for things you can't get done elsewhere, like recalls and warranty work. If I am paying someone to work on the Jeep I will take it to a shop that knows what they are doing and cares enough to do it right.
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Old 07-25-2019, 12:42 PM   #21
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The TPMS batteries will last from 7 to 10 years. After that, the entire TPMS unit has to be replaced. You can't just replace the batteries in the unit. I had a similar issue with my 2008 Chevy 2500 Silverado. When I put new tires on last year, I started getting low air pressure warnings. I had gone with a slightly larger tire, so the distance increase was too much for the weak batteries in the TPMS units to overcome. Had them replaced (Cost me $250 out the door at a local tire dealer) and the problem was solved. Stealership wanted $100 each for their OEM units plus labor!
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Old 07-25-2019, 01:10 PM   #22
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Quote:
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The wheels I put on my jeep are 17" 2007 Jeep Grand Cherokee Wheel Bright Chrome Clad (ALY9054U86 ). I don't think they had sensors back when these rims were made.
Does that make a difference? Do the stems have different sizes.

All light vehicles (cars and pickups) have the same size hole for the valve stem. So any TPMS will fit, the difference is the frequency on which they transmit. The TPMS units for your year are 315MHZ. In 2013 they changed the frequency to 433MHZ. Jeep started putting the TPMS in Jeep Wranglers in 2007.

The wheels you got may have originally had TPMS valve stems in them and they could have been removed when the owner put new wheels on his vehicle. Many times owners will move the TPMS transmitters from old wheels and put them in their new wheels, especially if the transmitters are relatively new and still in working order.
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Old 07-26-2019, 04:49 PM   #23
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Mine has been on for the last 6 mos or so. Thought it was a winter weather problem even though I checked all the pressure.

Just installed a new head unit that gives a better "picture" of what's going on. Interestingly, the pressures are all equal (+/- 1lb) - but some of the wheels show 35lbs yet show 'red' vs other 35lb showing 'green'.

Not sure what to make of it...except to ignore.

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