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TPMS Frequently Asked Questions

Frequently Asked Questions (FAQ)

Does the system need to be reprogrammed every time I change batteries?

No, you do not need to reprogram the TireMinder system every time you change batteries. Just remember to put the transmitter back on the same tire position they were taken off of.

For simple to follow instructions on how to replace the batteries, please follow this guide:

  • Make sure your TireMinder monitor is on.
  • Remove a single transmitter from the valve stem. Once removed, the TireMinder transmitter should display 0 PSI.
  • Once the transmitter is removed from the valve stem, remove the cap and then the CR1632 battery from underneath the battery bracket.
  • Insert a new battery into the transmitter’s battery bracket.
  • Screw the transmitter back onto the same valve stem it came off of.
  • Once the transmitter is back on the valve stem, the TireMinder monitor will display the updated tire pressure, confirming the procedure.

What is the difference between the TMG400C, TM66 and the A1A?

The main differences between the TireMinder TM66 and the A1A are the A1A has a 40% larger screen (slightly more than an inch larger), a dedicated ON/OFF button and mode indicators. Also, the TM66 is exclusive to Camping World.

Besides those differences the TM66 and A1A have nearly identical software.

As for our TMG400C, it has been retired since the beginning of 2015.

For a detailed comparison chart, please click here: TireMinder A1A, TM66 and TMG400C Comparison Chart

Aluminum Valve Stems & Galvanic Corrosion

Image of TireMinder Brass and Aluminum Transmitters

All towed vehicles will have either rubber (brass) or metal (aluminum) valve stems. If you have a rubber valve stem, you will need brass transmitters. If you have a metal valve stem, you will need aluminum transmitters.

RVs, MotorHomes, 5TH Wheels and Trailers will all have either rubber (brass) or metal (steel, chrome, or nickel) valve stems, all of which work with the TireMinder brass transmitters.

All TireMinder kits come with brass transmitters. If you need aluminum transmitter for your towed vehicle, they can be purchased separately.

How to get back to PSI from kPa, BAR or kgf/cm2 (stuck in kPa, BAR or kgf/cm2)

  1. Make sure you are in Monitoring Mode. Monitoring Mode is the mode where you can switch between temperature and pressure using the right and left button.
  2. Press and hold the center button for 5 seconds until you hear a beep.
  3. Once you hear the beep, you will be in Baseline Pressure Setting Mode.
  4. Press and release the center button until you see the unit of pressure flashing.
  5. Once the unit of pressure is flashing, use the right or left button to cycle between PSI, Bar, kPa and kgf/cm².
  6. When you have chosen which unit of pressure you would like to use, press and hold the center button for 5 seconds to save you settings.
  7. After 5 seconds you will hear a beep and be back into Monitoring Mode.

Note: To get to unit of pressure in Baseline Pressure Setting Mode, you will need to press and release (click) the center button the same amount of times as the amount of transmitters learned to your vehicle. Therefore, if you have 6 transmitters learned to your monitor, press and release the center button 6 times and the unit of pressure will be blinking. When the unit of pressure is blinking (PSI, Bar, kPa or kgf/cm⊃) you can use the right or left button to cycle through to a different unit of pressure.

Do I need a Signal Booster?

Yes, the booster is mandatory! The booster should be installed with every setup.

The booster was initially created for distance, but as the world has become more "wireless" since the introduction of the TireMinder system in 2008, signal interference has grown exponentially. We have included a signal booster in every kit since mid-2013, unless otherwise indicated, because of this fact. The booster needs to be installed to combat signal interference and make sure that you are getting the best signal possible.

What does NO5 or Signal Loss Mean?

If this appears on the display, it means the monitor has lost the “S”ignal from one or more transmitters. This issue needs to be addressed when convenient (before leaving on a trip, at the next rest stop or campground, etc.).

There are multiple possible causes for this warning:

  • The booster is not functioning. All TireMinder systems come with a booster included, unless otherwise indicated. If you have not installed it, then “shame on you.” If it is installed, check that the booster is powered correctly.
  • The antenna was not fully extended causing weak reception. (This does not apply to the Smart TPMS or TM-77)
  • The system is over 9 months old and the transmitter batteries need to be replaced. One of the transmitters has been lost or damaged.
  • Electronic Interference: With the constant addition of new wireless products (many running at 433 MHz), it is possible that the TireMinder® signal is being interrupted by electronic interference. If the signal comes back or is lost intermittently, you can rest assured the loss is due to such interference. 90% of this problem is cured by using the booster. Is yours installed with a green LED glowing? If YES, and all other possible signal loss reasons have been eliminated, consider moving the booster to a more central location.
  • Distance: Under normal operating conditions, distance is not an issue if you have installed the booster. At the same time, extreme cold and low transmitter battery (under 3 volts) power will shorten the operating distance even with a booster installed.
  • Missing Vehicle – “no5 (S)”: The appearance of the “no5 (S)” is inevitable when a towed vehicle/trailer is separated from the towing unit unless you implement the unique “Disconnect Mode”

If you do not use the “Disconnect Mode” but are aware you left the vehicle behind, you may simply ignore the warnings.

If you are not aware of the missing vehicle, we suggest you turn around and go find it!!!

When the two systems are re-united, the monitor will pick up the missing tires automatically. This usually happens within the first 20 minutes. If you need them to re-connect immediately, simply loosen (depressurize) and tighten (re-pressurize) the transmitters on any missing wheels.

OUR Recommended Alternative is to put the unit in the full “Auto-search Mode”

Why are the pressure readings from my TireMinder TPMS different than my tire gauge?

No (reasonably priced) pressure gauge is going to be 100% accurate. Likewise, NO TPMS is going to be 100% accurate. What’s important is that they are reasonably close and relatively consistent. You engineers and pilots probably have steam coming out of your ears after that last sentence!!

Maybe this will help.….

  • The TireMinder® transmitters are accurate to ± 3%.
  • TireMinder® brand pressure gauges (mechanical or digital) are among the most accurate on the market at ± two psi.

So, if you are running 100 psi in your tires, you could have a gauge reading 2 psi high and a TPMS transmitter reading 3 psi low leaving a difference of 5 psi. This is not uncommon and is considered totally acceptable. We have had calls from customers doing their initial installation saying all 8 or 10 TireMinder® transmitters are reading 9 to 11 pounds low!!! Can you guess what the problem is?? What is important to understand is that the TireMinder® TMPMS (and any other brand for that matter) is designed to warn you of changes. For example, it really does not care whether it starts at 97 psi or 108 psi. It is the changes and deviations from the baselines you need to know about.

So, please look at “the big picture”. You may use your trusty pressure gauge as the “standard” or you can use the TPMS as the standard. The important point is that they are all relatively consistent.

Can rubber valve stems be used with the TireMinder Transmitters?

Yes, TireMinder Transmitters may be used on rubber valve stems. However, we highly recommend brass or stainless steel valve stems.

Rubber valve stems can be an issue based on age, length and physical location (i.e. exposure to road salt, high heat, sun, etc). If using rubber valve stems, it is recommended that you check the condition of you rubber valve stems on a regular basis.

How to add or remove a transmitter

To add a transmitter, please click here.

To remove a transmitter, please click here.

To replace a transmitter, please click here.

What tire pressure should I set my RV tires to?

On your RV, there should be a permanently mounted placard (somewhere in the rig). It will have the various tire pressures recommended by the manufacturer to be used when the rig is new and empty.

By the time you add your groceries, water, liquid refreshments, etc. etc., you have probably added several thousands of pounds (and it may not all be balanced).

The best way to know exactly what pressures to run is by having your vehicle professionally weighed. Once you know the weight of your RV, you can use your tire manufacturer’s load and inflation table chart (found on our website or through RVSEF).

For a great article on tire inflation, please click here.

Are the transmitter/sensor batteries consumer replaceable?

Yes, our transmitters have user replaceable batteries.

For detailed instructions on how to replace the batteries, please click here.

Does TireMinder have Flow-Through Transmitters/Sensors?

We do not have flow-through sensors, but we do have Flow-Through Adapters (found here). These can convert our regular transmitter into a flow-through transmitter while still retaining the same weight and size of a normal flow-through transmitter/sensor.

Does the booster need to be powered 24/7?

Yes, our signal booster should be powered 24/7 while traveling.

While in storage, you may disconnect, or use a cut-off switch to stop the booster from draining power.

Please note, the signal booster draws very little energy. At 23.7mA, the booster would take a very long time to drain a battery. For a neat calculator that can tell you how long it would take for the booster to drain your battery, please click here.

For instance, it would take 98 days for the signal booster to drain a 80 AH battery (remember, 1 amp (A) is 1000 milliamps (mA)). Many batteries used in RVs are 200 AH or higher, which would translate into 246+ days to drain the battery.

Can I use a tire balancer with my TireMinder TPMS?

Equal can be used as a tire balancer with the TireMinder TPMS installed. Please note, in order for the Equal to properly work with the sensors the installer should replace the valve core of each tire that Equal is being put in (the bag of Equal comes with a replacement valve core). Also, we recommend to only check the tire with a tire gauge when the valve stem is near the top of the rotation (Equal will cause the air to leak from the tire if the valve stem is near the bottom).

If you would like to avoid these issues, we recommend having the tire balanced by machine. Remember, a tire does not need to be rebalanced upon adding our TireMinder transmitter.

Why can I only use the TireMinder Flow-Through Adapters on metal valve stems?

The majority of Class A MotorHomes will have steel or metal valve stems (nickel, brass with chrome plating, or a number of other combinations). When we state "metal valve stems" we are referring to the fact that the valve stem is attached to the wheel/rim with a metal device, such as a nut, and is in fact a metal or a non-aluminum alloy.

There are brass valve stems that fit in the category. However, the majority of brass valve stems are surrounded by rubber and use rubber connections to connect to the wheel/rim, making the connection vulnerable to deterioration. The added wait of the TireMinder Flow-Through Adapter coupled with the TireMinder Transmitter may exacerbate the natural deterioration of the rubber valve stem. This is why we do not recommend using the TireMinder Flow-Through Adapters with rubber valve stems.

In regards to aluminum valve stems, you do not need to worry about having aluminum valve stems on your MotorHome. Aluminum is only going to be found on cars, light trucks and SUVs. The TireMinder Flow-Through adapters are NOT COMPATIBLE with aluminum valve stems as it is a dissimilar metal than the metal used on the Flow-Through Adapters. Over time, dissimilar metals will fuse together and destroy both the aluminum valve stem and the TireMinder Flow Through adapter.

Can I use the TireMinder System on my Boat Trailer? Can the transmitters be submerged?

You can absolutely use the TireMinder system on your boat trailer. However, do not leave the transmitters submerged for long periods of time (>30 minutes).

TireMinder “WHAT IF” Solutions Guide
Not in the original instruction book



Configuration: Multiple wheels monitored including TOWED vehicle, trailer, etc. Usually 6 or 8 on the Power Unit plus 4 on the TOW.
Circumstance: Power unit (motor coach, truck, etc) is separated from the TOWED unit.
Monitor Reaction: Continues to read missing unit??

* The TireMinder TPMS will only notify you of the missing tires after 3 hours of separation. At that point the monitor will show “NO…5” which actually should be “NO…S” for “No Signal”.

* At the same time a battery icon will flash with “Sensor” underneath. Don’t mistake this as a weak battery in the transmitter.
* As long as you are aware you left the vehicle behind, you may simply ignore the warnings (it will only beep once an hour). If you are not aware of the missing vehicle, we suggest you turn around and go find it!!!

* When the two systems are re-united, the monitor will pick up the missing tires automatically. This last part usually happens within the first 20 to 30 minutes (sometimes it takes longer). If you need them to re-connect sooner, simply loosen and tighten the transmitters on the previously missing wheels.

“WHAT IF” #2:

Circumstance: Red light continues to flash after initial installation of all transmitters.

We assume the tires are at their recommended pressures before installing the system. If this was not done, the following may not apply. It may simply be that one of the tires is over over or under inflated by more than 20% (over) or 15% (under). If you know that all tires are at their proper pressures, read on.

Likely Problem: One of the tire locations (on the monitor) has been pre-programmed with the wrong tire pressure.

Solution: Press & Hold the center button for 5 seconds (until it beeps). Starting at the left front tire, the monitor will display the tire pressure YOU previously programmed for this position. If it’s correct, press and release the center button to move to the next position. Scroll through all the tire positions you had programmed and confirm that they are all set at the correct pressures. If you find one that is not, simply press the right or left buttons to either raise or lower the setting. When all are correct, press & hold the center button (until it beeps) to exit this mode. In 9 out of 10 cases, the red light will no longer be flashing (OK, maybe 7 out of 10).
Another Possibility: Please note the following example has nothing to do with dual tires. We have simply used the terminology in an attempt to explain what happens when a TireMinder transmitter has been mounted in a location that was not pre-programmed to your expected tire pressure needs.

Occasionally we have found users pre-programming the monitor for an inside dual position. When in the initial “learn” mode, they have selected the outside dual position on the monitor. Even though they mount the transmitter on the inside dual tire, the monitor will turn GREEN indicating that a signal has been received. It will show up as the outside dual on the monitor. As this position was probably not pre-programmed to their pressure, the unit will flash red after exiting from the learn mode.

In this instance, there are two solutions:

1. If you are OK with monitoring the tire condition at that location (on the receiver), simply press & hold the center button (until it beeps). Press the center button until you reach the outside dual position in question. You will see that the pressure at the top is not what you thought you had pre-programmed (probably 72.4 psi – factory default setting). Press the right or left button to raise or lower this setting to what this position should have. Press & Hold the center button again ( YES - until it beeps). The unit will pick up the correct pressure and there should be no red light.

2. Alternatively, if you want to change the position on the monitor (from the outside dual to the inside dual – example only EH?), you are going to have to go back to the incorrect position on the monitor, delete the position and then re-program to the correct position.

Hmmmm – how to start??

• Press & Hold the right and left buttons (until it beeps)
• Press the right or left buttons to scroll to the offending
position • You will see a pressure reading at the top (could be 0.0psi)
• Press & hold the center button (guess how long???)
• The top will show _ _ _ psi with a steady red light
• You have now erased this position
• Remove the TireMinder transmitter (if it’s still on the tire)
• Press the right or left button until you reach the location you wish to monitor
• Re-install the transmitter – the light should turn GREEN and you should have the tire’s exact pressure at the top of the monitor.
• Press and hold the right and left buttons (beep!!) to exit the “learn” mode

You have now moved the reading from the incorrect position (outside dual) to the correct position (inside dual) on the monitor. You should only see the tire positions which have transmitters mounted and of course NO RED FLASHING LIGHT!


Adding a towed vehicle (at a later date):

Condition: TMG400C or TMG500HD has been set up on one vehicle (i.e. Motor Coach with 6, 8 or 10 wheels). Monitor only shows the programmed number of tires.Owner wishes to add a towed vehicle (ex. Jeep w/4 wheels at 33 psi). The monitor was not originally programmed for these 4 tire pressures and the unit will not allow programming of additional wheel positions.

Solution A – Work backwards!!-

• Put monitor into “learn” mode (press and hold both right and left buttons until it beeps)
• Press right hand button to scroll to desired additional (new) position (light will be red)
• Mount a new transmitter (light turns green and shows pressure of tire)
• Press right hand button and scroll to next new position (red light)
• Mount another new transmitter (light turns green)
• Repeat for additional new locations
• When last transmitter has been mounted, Exit Learn mode by pressing and holding both buttons again.
• The monitor will then show the addition of the 4 new tires. As well, the unit will beep, the red light will flash as will all four new tire positions. Do NOT let all this activity throw you off (remain calm!!).
• It is now time to reprogram the pressures for the new positions.
• Press and hold the center button until it beeps.
• Press the center button and scroll to the first new position. Press the right or left button to increase or decrease the pressure to the desired amount (example 33 psi).
• Press the center button and repeat the above until all new positions have the correct pressures.
• Exit from this mode by pressing and holding the center button until you hear a beep.
• I know, the red light is still flashing!!! That’s because you need to do one more step (sorry).
• With the monitor in the normal mode, press the right or left button and scroll to the first “new” position.
• Unscrew the transmitter from the valve stem, wait for five seconds and re-tighten. Repeat for all new positions. The red light will no longer be visible after the last position has been reset.
• That’s it!! You have now added the towed wheels.

Solution B:

Delete all the original tire positions and start over (page 5 item 6 a,b,c & e not D). When all have been deleted, be sure to add the pressures for the new positions (page 3 item 1). Once this is done you are all set to mount the transmitters for both vehicles (page 4 item 2). Please note, as you probably already have the 6, 8 or 10 transmitters mounted, it will be necessary to loosen each one and re-tighten during the re-install process. Alternatively you may simply remove them all and remount as usual.


Pressure loss warning after driving (vehicle is parked or traffic slows rapidly after high speed highway driving).

Tires have heated up while driving at highway speeds. This can raise the pressures significantly. When the unit comes to a halt, this pressure will drop. Under normal conditions the drop in temperature is gradual. However, if it drops rapidly (3psi or more within 15 minutes), the TireMinder TPMS will beep and the red light will be activated. Obviously this should not be of concern as long as you know why the warning has occurred. The easiest way to stop the red light warning is to shut the monitor down completely (twice). This is done by pressing and holding the center button for 8 seconds (it will beep after 5 seconds – continue to hold it down for another 3 seconds. The unit will then go completely dark. Wait 5 seconds and press the center button to re-activate the monitor. Repeat if the red light is still flashing.
Alternatively, simply loosen the transmitter in question and re-tighten after 5 seconds. This will reset the system instantly.

We apologize that this scenario was not in the original instructions. It is unfortunate that the system cannot distinguish between pressure loss due to an actual leak versus pressure loss due to a rapid drop in temperature.

Solution:Unfortunately there is no quick solution at this time. The best thing is to understand when this warning may appear and then have the knowledge to know why it is happening.

We recommend inflating your tires with NITROGEN if possible. Nitrogen has many benefits, not the least of which is lower running temperatures (less susceptible to rising temperatures due to high speed). This should eliminate the above mentioned “false alarm” completely.

Some Advice: The OPTIONAL transmitter locks can be more trouble than they are worth unless you are in a high crime area. If you are in a high crime area, please leave the area immediately. The locks are NOT required to secure the transmitters to the valve stems. They are meant to be a theft deterrent only.

FOR YOUR TOWED VEHICLE: If your towed vehicle was manufactured after 2007, it may have aluminum valve stems. If so, you will need aluminum transmitters (for your towed vehicle.)

PLEASE CHECK TO SEE IF YOU HAVE BRASS OR ALUMINUM VALVE STEMS. “Unlike” metals (brass on aluminum) can fuse and corrode.The TireMinder® transmitters are available for either brass or aluminum valve stems. Contact your dealer or Minder Research, Inc. if you need more information.

IF YOU HAVE A GPS SYSTEM: it may interfere with transmission (signal loss) as they may function on the same frequency. Keep the monitors as far apart from eachother as posssible, and do NOT mount them together.

"Why does my monitor show 77° and 101 psi in the morning (before breakfast) when the actual temperature is 50° and my tire gauge says I have 90 psi?"

Sounds like your monitor has not updated yet from yesterday’s travels. The monitor goes into “sleep mode” when you stop to conserve its internal battery, and will not update under “normal” tire conditions (no pressure loss.) When you are ready to hit the road, simply “wake” the monitor by placing it in your pocket or next to the coffee maker where motion and activity will keep it awake, and soon you will see the monitor update each tire to the current psi and temperature.

"My monitor shows kPa (or Bar, kGa). How do I fix it?"

Go into the pressure setting mode from the monitoring mode by pressing and holding the center button for about five seconds until you hear a beep. Your left from tire will be blinking. Press and RELEASE the center button once for each wheel. After the last tire, the kPa (or Bar, kGa) will be blinking- use the RIGHT button to scroll to PSI, then press and release the center button to confirm your choice. The F button will blink, press the center button to confirm (unless you want Celsius) and the left front tire will now blink showing the cold (baseline) pressure. If the pressure (in psi) is correct, press and hold the center button for about 5 seconds until you hear a beep to return to the monitoring mode. If your baseline pressure is not correct, use the left and/or right hand buttons to correct the psi, then the center button to confirm. When finished, you must exit the pressure setting mode the same way you got in, by pressing and holding the center button for about 5 seconds until you hear a beep.

"One of my tires is missing from the screen. How do I get it back?"

Somehow the tire has been deleted. From the monitoring mode, press and hold BOTH the left and right hand buttons until you hear a beep and see all 22 tires on the screen. Use the right hand button to scroll to the missing position. There should be a red light at the top of the monitor, and the it will say - - - PSI on the monitor as the wheel position flashes. Go to the transmitter and remove it for about 3-5 seconds, then re-attach. You should get a green light and a pressure reading at the top of the screen. To exit the learn mode, you must press and hold both the left and right buttons at the same time until you hear a beep. You should now see that your tire(s) has returned...

"How much does the hard wired signal booster draw on my battery?"

12 Volt Battery23.7 mA2.8 W
24 Volt Battery11.85 mA1.4 W

"Where do I install my signal booster?"

Every set up is different. Please visit our Gallery Page for Signal Booster Installation Photos.

"How do I know my Signal Booster is working?"

There have been several changes to make sure your Signal booster is working.
In short, if your signal booster has a light (blinking, solid, red or green) it is working.

Tips & Tricks

Be sure to “air up” your tires to the manufacturer’s recommended psi(s) BEFORE installing the TPMS!

Skip the LOCKING RINGS while “on the road.” They make it difficult to add air or check your pressures with a tire gauge.

Transmitters may be used on rubber valve stems. We highly recommend the brass or stainless steel.
Rubber valve stems can be an issue, based on the Age, length and physical location (i.e. exposure to road salt, high heat, sun, etc), so be sure to check the condition of you rubber valve stems on a regular basis.

If you are adding a towed or toy hauler to your existing set-up, you will have to learn the transmitters to the monitor in the learn mode BEFORE you can set the baseline pressures. If you get in a pickle, call us, we’ll walk you through it!

Your transmitters are “married” to the wheels you have learned them to. Before removing them, or having tires rotated, use a metallic Sharpie® or a bright toe-nail polish to mark your transmitters either “LF” “RF” “LR” etc., or sequentially so that they can be returned to the correct wheel.

More Tips & Tricks

Which TireMinder Transmitters Do I Need? Brass VS Aluminum

TireMinder Booster Installation - Tips & Tricks

Tire Position Diagram

Going through a car wash with TireMinder transmitters

TireMinder TPMS Battery Replacement Program

Can I use a TireMinder TPMS with my motorcycle?

Hexagonal Locking Ring Installation

Locking Ring Installation

RVs with Mercedes Sprinter Chassis