TPMS rear driver wheel won't register.

[JLUJeff]

Add me to the club of people whose driver side rear tire pressure won't read. I recently purchased a used 2024 JLU with just over 10,000 miles on it. It came with virtually new (a month or two old) Nitto Trail Grappler tires (37x12.50R17LT) and KMC Grenade Crawl Beadlocks. I took it to the dealer and they recommend a local company that will work on vehicle with beadlocks (I later found out it was own by the same dealership). They could detect all the sensor and read the correct tire pressure with a sniffer. There was no sensor in spare tire. I spent $320 for them to add a sensor to the spare and to "fix" the problem. They couldn't figure out was was wrong. They got it to display 19 psi (an incorrect pressure) for a short time but it would go back out after a short drive.

After learning that the companies were related, I took it back to the dealership hoping it was a warranty issue. I was charged $237 and they were unable to resolve the problem. They told me that it might be related to some aftermarket modification and they sent me a service bulletin indicating a number of aftermarket modifications that might cause a problem.

After getting the Jeep home, I swapped the driver's side front and rear tires and drove it without any change (driver side rear still out). Here is where it got interesting.

• I let air out of the front driver’s side tire with the Jeep running and the front passenger side tire pressure indicator reading went down.
• I let air out of the front passenger side tire and there was no change in the TPMS readings.
• I let air out of the rear passenger side tire and the driver’s side front tire pressure indicator went down.
• I let air out of the driver’s side rear tire and the passenger side rear tire pressure indicator went down.

I have attached a pdf of the service bulletin that the dealer sent me. Today I ordered a JL Taser but I don't expect it to help me fix the problem. I did find that the Jeep had a PowerTEQ installed where the Taser goes. Looks like I might just have to live with the situation unless someone can find a solution. I'm relieved to know that I'm not the only one with this same problem.

Sponsored

 

[eck]

Add me to the club of people whose driver side rear tire pressure won't read. I recently purchased a used 2024 JLU with just over 10,000 miles on it. It came with virtually new (a month or two old) Nitto Trail Grappler tires (37x12.50R17LT) and KMC Grenade Crawl Beadlocks. I took it to the dealer and they recommend a local company that will work on vehicle with beadlocks (I later found out it was own by the same dealership). They could detect all the sensor and read the correct tire pressure with a sniffer. There was no sensor in spare tire. I spent $320 for them to add a sensor to the spare and to "fix" the problem. They couldn't figure out was was wrong. They got it to display 19 psi (an incorrect pressure) for a short time but it would go back out after a short drive.

After learning that the companies were related, I took it back to the dealership hoping it was a warranty issue. I was charged $237 and they were unable to resolve the problem. They told me that it might be related to some aftermarket modification and they sent me a service bulletin indicating a number of aftermarket modifications that might cause a problem.

After getting the Jeep home, I swapped the driver's side front and rear tires and drove it without any change (driver side rear still out). Here is where it got interesting.

• I let air out of the front driver’s side tire with the Jeep running and the front passenger side tire pressure indicator reading went down.
• I let air out of the front passenger side tire and there was no change in the TPMS readings.
• I let air out of the rear passenger side tire and the driver’s side front tire pressure indicator went down.
• I let air out of the driver’s side rear tire and the passenger side rear tire pressure indicator went down.

I have attached a pdf of the service bulletin that the dealer sent me. Today I ordered a JL Taser but I don't expect it to help me fix the problem. I did find that the Jeep had a PowerTEQ installed where the Taser goes. Looks like I might just have to live with the situation unless someone can find a solution. I'm relieved to know that I'm not the only one with this same problem.

It's odd that it seems to have driver/passenger reversed somehow. My understanding of the TPMS system in the JL is that it uses a combination of signal strength and direction of rotation to sort out where each wheel is located. On my 2018 (I think somewhere along the way this changed?) the receiver is mounted above the rear axle. It can determine that the rear wheels are in the rear because the signal for those two will be stronger than the signal from the front wheels. Then it's able to determine driver from passenger because during forward travel the driver wheels are rotating counter-clockwise but the passenger wheels are rotating clockwise. I don't know exactly how that works with the TPMS valvestems but maybe they're installed backwards/upside-down inside of the wheel or something which would cause them to report the opposite rotation?

 

[JLUJeff]

It's odd that it seems to have driver/passenger reversed somehow. My understanding of the TPMS system in the JL is that it uses a combination of signal strength and direction of rotation to sort out where each wheel is located. On my 2018 (I think somewhere along the way this changed?) the receiver is mounted above the rear axle. It can determine that the rear wheels are in the rear because the signal for those two will be stronger than the signal from the front wheels. Then it's able to determine driver from passenger because during forward travel the driver wheels are rotating counter-clockwise but the passenger wheels are rotating clockwise. I don't know exactly how that works with the TPMS valvestems but maybe they're installed backwards/upside-down inside of the wheel or something which would cause them to report the opposite rotation?

Interestingly enough, the first shop that did the work on it for me said the sensor on the driver side rear was installed backwards and they reinstalled it correctly. Apparently they are aftermarket sensors.

Sponsored