TPMS in Spare?

[ko15870]

Hi,

I was just wondering is there a TPMS in the spare tires on our Gladiators?

Thanks!

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[injaneer]

Hi,

I was just wondering is there a TPMS in the spare tires on our Gladiators?

Thanks!

No there is not.

 

[dcmdon]

But the guys who do 5 tire rotations have a 5th. And apparently the system does a good job of only paying attention to the ones that are turning.

Or they have none and have turned off TPMS with a Tazer or similar.

 

[DobaMark]

But the guys who do 5 tire rotations have a 5th. And apparently the system does a good job of only paying attention to the ones that are turning.

Or they have none and have turned off TPMS with a Tazer or similar.

The TPMS sensor stops sending a signal soon after the tire stops rotating to preserve battery life. So the spare tire would not send a signal even if it had a sensor.
I swapped on wheels from a Wrangler and in that application the spare does have a sensor so it would work if I installed it on one of the other locations. But is't a non-matching tire so I won't put it into rotation.

 

[ko15870]

Thanks for the replys everyone.

 

[ShadowsPapa]

The TPMS sensor stops sending a signal soon after the tire stops rotating to preserve battery life. So the spare tire would not send a signal even if it had a sensor.
I swapped on wheels from a Wrangler and in that application the spare does have a sensor so it would work if I installed it on one of the other locations. But is't a non-matching tire so I won't put it into rotation.

Yup. I have a fully matching wheel and tire as a spare, do a 5 tire rotation and have the sensors in all 5 - identical sensors I bought from Benny - allmoparparts.
Zero issues. When the tires get rotated by the time I leave the driveway things are working fine.

The stock spare has no TPMS - I guess why waste money when many people will never pull the stock tire down or if they do, years have passed.

And the bit on not sending a signal, etc. - when I've driven my truck and parked it on a 35 degree day and then go out the next day and it's 5 below, the tires at first still say 35 psi or so. Then I get to the end of the driveway and it freaks out because now they are 29 and 30 psi.

 

[injaneer]

Yup. I have a fully matching wheel and tire as a spare, do a 5 tire rotation and have the sensors in all 5 - identical sensors I bought from Benny - allmoparparts.
Zero issues. When the tires get rotated by the time I leave the driveway things are working fine.

The stock spare has no TPMS - I guess why waste money when many people will never pull the stock tire down or if they do, years have passed.

And the bit on not sending a signal, etc. - when I've driven my truck and parked it on a 35 degree day and then go out the next day and it's 5 below, the tires at first still say 35 psi or so. Then I get to the end of the driveway and it freaks out because now they are 29 and 30 psi.

Yeah just got my 5th wheel yesterday. Now to get it mounted with a TPMS sensor added to start the 5 tire rotation.

 

[Average Oregonian]

The TPMS sensor stops sending a signal soon after the tire stops rotating to preserve battery life. So the spare tire would not send a signal even if it had a sensor.
I swapped on wheels from a Wrangler and in that application the spare does have a sensor so it would work if I installed it on one of the other locations. But is't a non-matching tire so I won't put it into rotation.

TPMS will work when the vehicle is stationary. You can test this by airing up and down in your driveway with the vehicle running. Selectable Fill Alerts also wouldn't work if TPMS didn't update when stationary.

 

[DobaMark]

TPMS will work when the vehicle is stationary. You can test this by airing up and down in your driveway with the vehicle running. Selectable Fill Alerts also wouldn't work if TPMS didn't update when stationary.

But it will only work for a while, as I said the sensors WILL time out after the vehicle sets for a length of time to preserve battery life.

 

[ShadowsPapa]

TPMS will work when the vehicle is stationary. You can test this by airing up and down in your driveway with the vehicle running. Selectable Fill Alerts also wouldn't work if TPMS didn't update when stationary.

Mark is right - it only works for a time. They assume when you are letting tires down or refilling you have been moving and not sitting for 60 minutes before you do so.
Like my examples of parking my own truck after a drive and then seeing those same numbers the next day until I drive a few feet and it's 0 or below and suddenly the numbers drop. I can watch them change as I leave the garage and proceed up the driveway. Temperatures here can go from 50s to sub-zero in hours so tire pressures also vary wildly at times. The past couple of weeks have proven to me how little time it takes for those to "turn on" again and start working, and how they obviously "go to sleep" after parking for a while.
I do not yet know what the threshold is as far as time, but they absolutely shut off after a while.
Stop and you have some time, but park it and come back an hour later - likely they will not be registering.
There is a time-out. So don't wait to use that fill alert stuff, if so equipped.

 

[Radio Guy]

Anyone know how long the TPMS batteries last in general? Are the batteries replaceable like when you change tires?

 

[ShadowsPapa]

I don't know about these but my neighbor has gotten 5-6 years out of his, Ford and GM vehicles.

 

[dcmdon]

Yup. I have a fully matching wheel and tire as a spare, do a 5 tire rotation and have the sensors in all 5 - identical sensors I bought from Benny - allmoparparts.
Zero issues. When the tires get rotated by the time I leave the driveway things are working fine.

The stock spare has no TPMS - I guess why waste money when many people will never pull the stock tire down or if they do, years have passed.

And the bit on not sending a signal, etc. - when I've driven my truck and parked it on a 35 degree day and then go out the next day and it's 5 below, the tires at first still say 35 psi or so. Then I get to the end of the driveway and it freaks out because now they are 29 and 30 psi.

After you all reminded me how to see tire pressure on the center dash display I've left that up for several days. At roughly 40 deg my tires have 37 psi.

I left y truck outside overnight last night. When I got in it at 9 deg it showed 33 psi.

Last weekend it was -16. I wonder what the tires had in them then.

 

[ShadowsPapa]

After you all reminded me how to see tire pressure on the center dash display I've left that up for several days. At roughly 40 deg my tires have 37 psi.

I left y truck outside overnight last night. When I got in it at 9 deg it showed 33 psi.

Last weekend it was -16. I wonder what the tires had in them then.

I had mine about 35 I think going into winter. A few days ago it was 0 or below and one was 29 and the other at 30. So they dropped 5 psi easily. The bad is that now that red won't go away and the psi display keeps popping up and saying inflate to 36.
I need to figure out which setting it is to change the threshold down a bit so when the tires go below 32 psi it doesn't freak out. I know I can set it in jscan or AlfaOBD - just can't recall the setting (stock tires on Overland are 38, the tires I have now should run 35/36.)

 

[Hootbro]

Anyone know how long the TPMS batteries last in general? Are the batteries replaceable like when you change tires?

Having owned a few FCA vehicles over the years, 4-7 years is the zone I have seen them start to fail

The batteries are not readily replaceable and are potted in when the sensor is built and the whole sensor is replaced when the battery starts to fail.

Generally when one TPMS sensor ages out and fails, the remaining are usually not far behind and would suggest to be looking at replacing them all at once when the first sensor starts to go .

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