TPMS stops reading pressure

[Ratbert]

After doing Fins & Things yesterday we were in the starting area of Hell's Revenge airing up. TPMS was registering everything incrementing fine, then stopped moving.

Flipped the screen to another, then back. Everything changed one time to show the latest numbers, then refused to change again. It was stuck at about 30psi.

Turned off the Jeep and back on. No change. TPMS readout wouldn't budge.

I gave up, shut off the compressor, put the air lines back in the bag, and drove off.

A short time later it finally updated, showing all tires at around 39psi.

Thoughts on what would cause it to not update and how to resolve it? It's definitely still under warranty.

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[J0E]

After doing Fins & Things yesterday we were in the starting area of Hell's Revenge airing up. TPMS was registering everything incrementing fine, then stopped moving.

Flipped the screen to another, then back. Everything changed one time to show the latest numbers, then refused to change again. It was stuck at about 30psi.

Turned off the Jeep and back on. No change. TPMS readout wouldn't budge.

I gave up, shut off the compressor, put the air lines back in the bag, and drove off.

So your Jeep wasn't moving and you expected the TPMS to provide real time pressure? That's not how it works reliably. You need to drive.

A few guys in my off road club do the same thing. They report the TPMS is wildly inaccurate until you drive a few hundred yards. They also report that you have to keep the engine running or the reading are even more off.

A short time later it finally updated, showing all tires at around 39psi.

Thoughts on what would cause it to not update and how to resolve it? It's definitely still under warranty.

Not a short time, but a short drive, right?

I'm guessing you've used the static TPMS approach before and it worked and that set your expectations. Don't you have a pressure gauge on your refill system?

 

[tk1700]

From 2021 Owners Manual page 316. My understanding is that Rubicons have this feature:

Tire Fill Alert
This feature notifies the user when the placard tire pressure is attained while inflating or deflating the tire.
The customer may choose to disable or enable the Tire Fill Alert feature in the apps menu of the Uconnect system.
NOTE:

•  Only one tire can be filled at a time when using the Tire Fill Alert system.
•  The Tire Fill Alert feature cannot be entered if an existing TPMS fault is set to “active” or if the system is in deactivation mode (if equipped).
  The system will be activated when the system detects an increase in tire pressure while filling the tire. The ignition must be in the ON/RUN mode with the transmission in PARK for vehicles equipped with an automatic transmission. For vehicles equipped with a manual transmission, the park brake must be applied.
  NOTE:
  It is not required to have the engine running to enter Tire Fill Alert mode.

The hazard lamps will come on to confirm the vehicle is in Tire Fill Alert mode. If the hazard lamps do not come on while inflating the tire, the Tire Pressure Monitoring System sensor may be in an inoperative position, preventing the TPM sensor signal from being received. In this case, the vehicle may need to be moved slightly forward or backward.
When Tire Fill Alert mode is entered, the tire pressure display screen will be displayed in the instrument cluster.
Operation:
 The horn will chirp once to let the user know when to stop filling the tire, when it reaches recommended pressure.
 The horn will chirp three times if the tire is overfilled and will continue to chirp every five seconds if the user continues to inflate the tire.
 The horn will chirp once again when enough air is let out to reach proper inflation level.
 The horn will also chirp three times if the tire is then underinflated and will continue to chirp every five seconds if the user continues to deflate the tire.
Selectable Tire Fill Alert (STFA) — If Equipped
The STFA system is an optional feature that is included as part of the normal Tire Fill Alert system. The system is designed to allow you to select a pressure to inflate or deflate the vehicle's front and rear axle tires to, and to provide feedback while inflating or deflating the vehicle's tires.
In the Selectable Tire Fill Alert application, which is located in the apps menu of the Uconnect system, you will be able to select a pressure setting for both the front and rear axle tire pressures by scrolling through a pressure range from XX to 15 psi in 1 psi increments for each axle setting.
XX = the vehicle's cold placard pressure values for the front and rear axles as shown on the vehicle placard pressure label.
You may also store pressure values chosen for each axle in the Uconnect system application as preset pressure values. Up to two sets of preset pressure values can be stored in the Uconnect system for the front and rear axle. Once you select the tire pressures for the front and rear axles that you want to inflate or deflate to, you can begin inflating or deflating one tire at a time.

NOTE:
The STFA system will only support inflating or deflating one tire at a time.
The system will be activated when the TPMS receiver module detects a change in tire pressure. The ignition must be in the ON/RUN mode, with the transmission in PARK in vehicles with an automatic transmission, and in NEUTRAL with the parking brake engaged in vehicles with a manual transmission. The hazard lamps will come on to confirm the vehicle is in Tire Fill Alert mode.
When Tire Fill Alert mode is entered, the tire pressure screen will be displayed in the instrument cluster. If the hazard lamps do not come on while inflating or deflating the tire, the Tire Pressure Monitoring System sensor may be in an inoperative position, preventing the TPMS sensor signal from being received. In this case, the vehicle may need to be moved slightly forward or backward.
Horn chirps will indicate STFA status as tires are inflated/deflated. The horn will chirp under the following STFA states:
1. The horn will chirp once when the selected pressure is reached to let you know when to stop inflating or deflating the tire.
2. The horn will chirp three times if the tire is over-inflated or over-deflated.
3. The horn will chirp once again when enough air is added or removed to reach proper selected pressure level.

 

[Ratbert]

Not a short time, but a short drive, right?

I'm guessing you've used the static TPMS approach before and it worked and that set your expectations. Don't you have a pressure gauge on your refill system?

A short time, not drive.

In my previous JLUR (2020) I just had to have the engine running for the TPMS to be fairly accurate while airing up.

I have the Epic Kraken inflation system, so no external pressure gauge. All of the videos that I've watched for it indicate to simply watch the TPMS readings, which worked as expected in my last JLUR.

 

[Ratbert]

From 2021 Owners Manual page 316. My understanding is that Rubicons have this feature:

Tire Fill Alert
This feature notifies the user when the placard tire pressure is attained while inflating or deflating the tire.
The customer may choose to disable or enable the Tire Fill Alert feature in the apps menu of the Uconnect system.
NOTE:

•  Only one tire can be filled at a time when using the Tire Fill Alert system.
•  The Tire Fill Alert feature cannot be entered if an existing TPMS fault is set to “active” or if the system is in deactivation mode (if equipped).
  The system will be activated when the system detects an increase in tire pressure while filling the tire. The ignition must be in the ON/RUN mode with the transmission in PARK for vehicles equipped with an automatic transmission. For vehicles equipped with a manual transmission, the park brake must be applied.
  NOTE:
  It is not required to have the engine running to enter Tire Fill Alert mode.

The hazard lamps will come on to confirm the vehicle is in Tire Fill Alert mode. If the hazard lamps do not come on while inflating the tire, the Tire Pressure Monitoring System sensor may be in an inoperative position, preventing the TPM sensor signal from being received. In this case, the vehicle may need to be moved slightly forward or backward.
When Tire Fill Alert mode is entered, the tire pressure display screen will be displayed in the instrument cluster.
Operation:
 The horn will chirp once to let the user know when to stop filling the tire, when it reaches recommended pressure.
 The horn will chirp three times if the tire is overfilled and will continue to chirp every five seconds if the user continues to inflate the tire.
 The horn will chirp once again when enough air is let out to reach proper inflation level.
 The horn will also chirp three times if the tire is then underinflated and will continue to chirp every five seconds if the user continues to deflate the tire.
Selectable Tire Fill Alert (STFA) — If Equipped
The STFA system is an optional feature that is included as part of the normal Tire Fill Alert system. The system is designed to allow you to select a pressure to inflate or deflate the vehicle's front and rear axle tires to, and to provide feedback while inflating or deflating the vehicle's tires.
In the Selectable Tire Fill Alert application, which is located in the apps menu of the Uconnect system, you will be able to select a pressure setting for both the front and rear axle tire pressures by scrolling through a pressure range from XX to 15 psi in 1 psi increments for each axle setting.
XX = the vehicle's cold placard pressure values for the front and rear axles as shown on the vehicle placard pressure label.
You may also store pressure values chosen for each axle in the Uconnect system application as preset pressure values. Up to two sets of preset pressure values can be stored in the Uconnect system for the front and rear axle. Once you select the tire pressures for the front and rear axles that you want to inflate or deflate to, you can begin inflating or deflating one tire at a time.

NOTE:
The STFA system will only support inflating or deflating one tire at a time.
The system will be activated when the TPMS receiver module detects a change in tire pressure. The ignition must be in the ON/RUN mode, with the transmission in PARK in vehicles with an automatic transmission, and in NEUTRAL with the parking brake engaged in vehicles with a manual transmission. The hazard lamps will come on to confirm the vehicle is in Tire Fill Alert mode.
When Tire Fill Alert mode is entered, the tire pressure screen will be displayed in the instrument cluster. If the hazard lamps do not come on while inflating or deflating the tire, the Tire Pressure Monitoring System sensor may be in an inoperative position, preventing the TPMS sensor signal from being received. In this case, the vehicle may need to be moved slightly forward or backward.
Horn chirps will indicate STFA status as tires are inflated/deflated. The horn will chirp under the following STFA states:
1. The horn will chirp once when the selected pressure is reached to let you know when to stop inflating or deflating the tire.
2. The horn will chirp three times if the tire is over-inflated or over-deflated.
3. The horn will chirp once again when enough air is added or removed to reach proper selected pressure level.

Thanks for verifying that it should work somewhat as I was expecting. I'm pretty sure, however, that the alerting thing was only for 2021s.

 

[J0E]

This feature notifies the user when the placard tire pressure is attained while inflating or deflating the tire.

•  Only one tire can be filled at a time when using the Tire Fill Alert system.

Are you only doing 1 tire at a time and inflating to 37 PSI?

. If the hazard lamps do not come on while inflating the tire, the Tire Pressure Monitoring System sensor may be in an inoperative position, preventing the TPM sensor signal from being received. In this case, the vehicle may need to be moved slightly forward or backward.

Exactly what I said, you need to drive a bit to get accurate readings.

• NOTE:
  It is not required to have the engine running to enter Tire Fill Alert mode.

You wouldn't think so, but everyone I know who uses this approach would disagree.

Thanks for verifying that it should work somewhat as I was expecting. I'm pretty sure, however, that the alerting thing was only for 2021s.

They didn't delete it, they just quit saying it would work because it's not reliable. At least that what the folks I wheel with claim.

BTW, I'm amazed how accurate the TPMS system is on my 2021 JLR after driving a few hundred yards. It's off about 1.5 PSI below 13 PSI.

 

[J0E]

Here's a good thread on TPMS systems. Everyone recommends driving to get a good reading.

 

[Ratbert]

Here's a good thread on TPMS systems. Everyone recommends driving to get a good reading.

Ok, so the fact that it worked as expected in my 2020 was a fluke, and all of the videos showing how the Epic Kraken works are also just flukes?

I'm not sure how that system would work if it required you to drive. Connect everything up to ask four tires, hit the button for some period of time, turn it off, disconnect everything from all four tires, drive from the air up spot, return to it, repeat???

 

[tk1700]

I've never used it. I know it's there and think it's easier to just use a good pressure gauge to get to the desired pressure.

 

[Ratbert]

I've never used it. I know it's there and think it's easier to just use a good pressure gauge to get to the desired pressure.

It might be more accurate, but you really think that it's easier?

 

[acomputernerd]

Not to get in the middle of it, there are batteries in the sensor and you may have a bad one. I have used this system on my 2021 quite effectively without moving it and it is accurate at least in my system. I do have two sets of wheels and tyres, when I swap them out it does take movement to read the swap. This applies to a spare but just filling up using the TPMS doesn't need me to be moving. I turn on the sensor hook it all up and the horn blows when done. I did it one at a time and now all at once with the onboard air.

 

[Mocopo]

Same thing happens to me, but only on my front passenger tire. It stops at 36, which is annoying because i just needed it to go one more stinking lb!! It won't update until after I drive a few undred yards. I'm thinking of just making 36 my regular pressure lol. I ran my JK at 32, and just lived with the TPMS light on...

 

[Ratbert]

Not to get in the middle of it, there are batteries in the sensor and you may have a bad one. I have used this system on my 2021 quite effectively without moving it and it is accurate at least in my system. I do have two sets of wheels and tyres, when I swap them out it does take movement to read the swap. This applies to a spare but just filling up using the TPMS doesn't need me to be moving. I turn on the sensor hook it all up and the horn blows when done. I did it one at a time and now all at once with the onboard air.

Thanks for the response. I'm thinking that it's probably not batteries though since it's only a few months old and all of the tires stop reporting their pressure.

 

[Some Random Guy]

This is pretty normal. I’d just fill until 1-2 tires read the PSI you want, shut it off, wait 1-2 minutes, then disconnect and drive. Any sensor that was struggling to update will then do so. Because it’s a 4 tire inflation system it should be fairly even in all 4 corners unless there was an obstruction or leak.

 

[Ratbert]

Same thing happens to me, but only on my front passenger tire. It stops at 36, which is annoying because i just needed it to go one more stinking lb!! It won't update until after I drive a few undred yards. I'm thinking of just making 36 my regular pressure lol. I ran my JK at 32, and just lived with the TPMS light on...

It wouldn't be too much of an issue if at least one of them continued since I do all four at once.

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