Tire Pressure Sensor Issue - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 31 (permalink) Old 06-08-2009, 11:07 AM Thread Starter
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Tire Pressure Sensor Issue

ok so i just put the 20" GC SRT8 wheels on my commander....i got them from factory reproductions and they came mounted and balanced with new tire pressure sensors already installed. when i bolted the wheels on everything was fine, no tpms light, and i drove it for a day with no problems....then while admiring the wheels i noticed that the tires looked a little low on air, and when i put the gauge on them it read about 32 psi.....the new tires have the same pressure rating as the stock ones (max 44 psi), so i inflated them to about 40 psi and as soon as i did this the tpms light came on....it will blink for about a minute then stay on steady. the owners manual says this blinking then steady illumination indicates a malfunction with the TPMS.....so i took the pressure down to about 38 psi but the light still comes on. does anybody know what the problem may be? what is the factory setting for the TPMS alert? or what pressure should i be running the tires at? the light didnt come on until i put more air in the tires but i put in the same amount of air that the stock tires had in them...
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post #2 of 31 (permalink) Old 06-08-2009, 11:14 AM
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In the doorjamb, the sticker with the tire info says 35 psi. Thats what I keep mine at and on the cold winter mornings if one is just a little low, it will trip the light. Not sure about too much air though.

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post #3 of 31 (permalink) Old 06-08-2009, 11:44 AM
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They probably have sensors that don't match the ones for the Commander. No, they are not all the same.

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post #4 of 31 (permalink) Old 06-08-2009, 11:45 AM
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Like stated above, drop them down to 35 psi and see if the light goes off. Just because the tire say max psi is 44 doesnt mean the tpms will like that much psi in the tire.




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post #5 of 31 (permalink) Old 06-08-2009, 12:07 PM
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See if the model number of the sensor is on your receipt, My guess is that Jeep5253 is correct and the sensors installed belong on a different model year Commander.



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post #6 of 31 (permalink) Old 06-08-2009, 12:14 PM
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I run 44psi with the stock TPMS sensors and have no issues. I think the only recourse you might have is take it in and have the sensors checked or swap the sensors from your stock rims.

Did your TPMS light go on at all when you mounted the new rims and then go out (learning mode)? Mine will trip on every tire rotation until it learns which sensor is at which corner.

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post #7 of 31 (permalink) Old 06-08-2009, 12:35 PM Thread Starter
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the light didnt go on at all until i put more air in the tires....i think its possible that it is not the correct sensor because the application listed on their website was for "2006-2008 commander" and i have read that the sensors are different for various years...i will try to bring the pressure down and see what happens....thanks everyone
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post #8 of 31 (permalink) Old 06-08-2009, 01:27 PM
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Quote:
Originally Posted by BlackonBlack View Post
I run 44psi with the stock TPMS sensors and have no issues. I think the only recourse you might have is take it in and have the sensors checked or swap the sensors from your stock rims.

Did your TPMS light go on at all when you mounted the new rims and then go out (learning mode)? Mine will trip on every tire rotation until it learns which sensor is at which corner.
Is there a reason why you run 44 psi in you tires and not the recommended psi? Also he mentioned that the TPMS light didnt come on until he brought the tires up to 40 psi. Also I have never heard of the TPMS trip on tire rotations. I rotate my tires every 2,000 miles and have had three different size tires on my jeep with no problems what so ever with the TPMS.




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post #9 of 31 (permalink) Old 06-08-2009, 02:04 PM Thread Starter
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anyone know the part number for the 08 sensors so i can compare?
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post #10 of 31 (permalink) Old 06-08-2009, 02:31 PM
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Quote:
Originally Posted by 07JeepXK View Post
Is there a reason why you run 44 psi in you tires and not the recommended psi? Also he mentioned that the TPMS light didnt come on until he brought the tires up to 40 psi. Also I have never heard of the TPMS trip on tire rotations. I rotate my tires every 2,000 miles and have had three different size tires on my jeep with no problems what so ever with the TPMS.

The 44psi is from tire tread temp measurements with the new tires- 37psi with the stock.

It's an old autocross thing that I've been doing for quite a few years. Drive hard then stop and take tread temps accross the width of the tread with an infrared pyrometer. Colder in the center increase pressure, warmer in the center-reduce the pressure. It makes sure the contact patch is maximized and load is distrubted evenly accross the tread. With most lifted vehicles, you'll see the outer temps a little higher than inners because of the change in camber. Lowered vehicles are generally the opposite, but a smooth gradiant is what you're looking for.

You gain two things doing this:
1- even tire wear (longer tread life)
2- maximum on-road traction.

Keep in mind that the recommended psi takes many factors in to play from mileage, to ride comfort, to load capability. I don't know if the "idiot light" threshold is different from vehicle to vehicle, but mine doesn't give me a high light until I hit about 52psi.

My TPMS light goes on every time I rotate my tires, but turns off after about 5 min of driving. The system works fine and the guys at Discount said this was normal too when I asked about it the first time it happened.

'06 Blacked out, 4.7, 2" RoughCountry lift, SpiderTrax 1.5" spacers, 255/75/17 BFG Mud Terrain, Blacked out and cleared stock rims, Tinted turns and tails, LED interior lighting, Garmin GPS, stealth holster.
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