I went to check the tire pressure on my recently purchased Class C. The rear duel tires did not have a stem to allow me to use a tire gage. I then wondered if I had the TPMS system on my tires. If so, how can I tell if the system is there? If it is a TPMS system, how would I increase the tire pressure in the tires when they are low? How does the TPMS system work to alert the owner that the tires need attention?Always appreciate the wisdom of members on this forum.

There is a valve stem somewhere on the tire.

nbking wrote: The rear duel tires did not have a stem to allow me to use a tire gage. If it is a TPMS system, how would I increase the tire pressure in the tires when they are low? How does the TPMS system work to alert the owner that the tires need attention?Always appreciate the wisdom of members on this forum.I think you are confused. Is this your first dealings with dual rear tires ??TPMS or not, there is a stem SOMEWHERE. They most often are really hard to see and get to on the inside tire but they are there; have to be.A TPMS system has sensors, either at the base of the stem inside the tire (factory setup) or the outside of the stem has a "fat spot" in it, usually an oversized cap with the transmitter in it. Then you need a receiver device to display the readings and monitor them.HIGHLY unlikely that you have TPMS and you just need to find those inside stems and figure out how to deal with them.I have stem flexible extenders to solve that problem and they are more trouble than they are worth. I will be changing to solid extenders as soon as I get a set.....and the TPMS goes on the end where the shrader valve is.

Generally you'd have a receiver module somewhere near the driver's seat if you had an aftermarket TPMS system. My guess is that you don't have one. Most of the ones I'm aware of used on motorhomes have sensors/senders that are also valve stem caps, but there are other styles of senders available too, at least for some vehicles and applications. (Some replace the valve stems entirely, others just sit inside the tire/wheel and aren't externally visible at all.)It sounds like you need a dual head air gauge (and air chuck for filling). These are not hard to find, and have a sort of angled bit at the tire valve end where one part connects more or less straight forward to access the inner valve stem, and the other part points backwards at an angle to get at the outer wheel's valve stem.There are a couple general styles of these available, the more common ones with the two connections in line with each other (and so both angled), and then a style where the one for the inner is not angled but inline with the body of the chuck or gauge. The latter I find more convenient for the wheels on my motorhome, though either one can be used.A lot of people like metal extended valve stems which make access a good bit easier.Edit: Just to make sure it's clear, the valve stems for duallies are generally in between the two tires--that is, the stem on the outer wheel points inward, and that on the inner wheel points outward, and both are accessed through the hand holes on the wheels. It's somewhat of a pain, frankly.

K Charles wrote:There is a valve stem somewhere on the tire.Somewhere on the wheel. If the wheels are steel. There is usually a stainless steel liner installed on wheel. It may be installed in wrong position covering valve stem.

Go on Amazon.com and search for Tire Pressure Monitoring Systems.See if you have something similar in the cab of the MH. You need some type of gauge or monitor screen for a TPMS.If you can't find a tire stem, take the rig to a tire dealer, they will show you where the stems are located. You need a way to air up the tires and may need longer stems.

How do we know if TPMS system is installed? | Good Sam Community

12 Replies

Sam_Spade
Explorer
May 09, 2017
nbking wrote:
The rear duel tires did not have a stem to allow me to use a tire gage.

If it is a TPMS system, how would I increase the tire pressure in the tires when they are low?

How does the TPMS system work to alert the owner that the tires need attention?

Always appreciate the wisdom of members on this forum.

I think you are confused. Is this your first dealings with dual rear tires ??

TPMS or not, there is a stem SOMEWHERE. They most often are really hard to see and get to on the inside tire but they are there; have to be.

A TPMS system has sensors, either at the base of the stem inside the tire (factory setup) or the outside of the stem has a "fat spot" in it, usually an oversized cap with the transmitter in it. Then you need a receiver device to display the readings and monitor them.

HIGHLY unlikely that you have TPMS and you just need to find those inside stems and figure out how to deal with them.

I have stem flexible extenders to solve that problem and they are more trouble than they are worth. I will be changing to solid extenders as soon as I get a set.....and the TPMS goes on the end where the shrader valve is.
K_Charles
Explorer
May 09, 2017
There is a valve stem somewhere on the tire.

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How do we know if TPMS system is installed?

12 Replies

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