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11-28-2020, 03:30 PM
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#1
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Member
Join Date: Sep 2020
Posts: 65
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TTPMS Compatibility Question
I just purchased a new 2021 Forest River Rockwood Mini Lite 2507s that came with the TST Tire Pressure sensors in the tires (TST 507 Series). I have a 2021 GMC Yukon that has the capabilities of monitoring trailer tires that have the sensors in them. The Yukon came with valve stem sensors that are labeled 4T. My question is, should the TST 507 sensors that are currently in my trailer tires work with my GMC's on-board monitor or will I need to remove the TST 507 sensors and put in the GMC 4T valve stem sensors for the GMC monitor to work? My trailer came with a TST color display monitor but I want to use the display that is in my Yukon so I don't have to use a separate monitor for the tires.
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11-29-2020, 08:13 AM
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#2
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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I'm not sure how the factory GMC system works with that in mind I would wonder if the truck display system would show an alarm when you unhook from the trailer and pull out of range of the sensors?
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11-29-2020, 08:56 AM
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#3
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Senior Member
Join Date: Jul 2010
Location: Waynesville
Posts: 14,428
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Quote:
Originally Posted by Mr. Ed
I just purchased a new 2021 Forest River Rockwood Mini Lite 2507s that came with the TST Tire Pressure sensors in the tires (TST 507 Series). I have a 2021 GMC Yukon that has the capabilities of monitoring trailer tires that have the sensors in them. The Yukon came with valve stem sensors that are labeled 4T. My question is, should the TST 507 sensors that are currently in my trailer tires work with my GMC's on-board monitor or will I need to remove the TST 507 sensors and put in the GMC 4T valve stem sensors for the GMC monitor to work? My trailer came with a TST color display monitor but I want to use the display that is in my Yukon so I don't have to use a separate monitor for the tires.
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Ask yourself,"will the GMC valve stems fit your Trailer wheels"? Can you change the Pressure setting on the GMC valve sensors to accept the Trailer Tire pressure ? Youroo!!
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11-29-2020, 09:13 AM
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#4
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Member
Join Date: Sep 2020
Posts: 65
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Let me clarify... The valve stems came with the Yukon as part of their max trailering package are specifically made to install on a trailer. There is a way to set the tire pressure and temp for the specific trailer. I am just trying to avoid having the replace the ones that came already installed on the trailer.
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11-29-2020, 09:15 AM
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#5
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Senior Member
Join Date: Jul 2015
Posts: 7,053
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I would go with the GM OEM valve stems just so I didn’t have to worry about any unforeseen problems.
Bruce
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2016 Rockwood Windjammer 3029W Diamond Edition
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW
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11-29-2020, 10:02 AM
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#6
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Site Team
Join Date: Nov 2010
Location: Northeast Louisiana
Posts: 33,962
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Internal TPMS transmit on a few different dedicated frequencies. You may want to see what frequency the TST's transmit on and also the GM ones. 315 and 433 ranges are the two common use.
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 2011 Flagstaff 831 RLBSS
A 72 hour hold in a psych unit is beginning to intrigue me as a potential vacation opportunity.
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11-29-2020, 10:21 AM
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#7
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Member
Join Date: Sep 2020
Posts: 65
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The GMC sensors say 433Mhz. The TST says 433.92 Mhz. Not sure it this means they are different or not.
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11-29-2020, 10:28 AM
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#8
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Senior Member
Join Date: Jul 2015
Posts: 7,053
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That is the same. 433Mhz is just short for 433.92Mhz.
Bruce
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2016 Rockwood Windjammer 3029W Diamond Edition
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW
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11-29-2020, 10:33 AM
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#9
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Senior Member
Join Date: Aug 2014
Location: Northern KY
Posts: 5,725
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I don't believe the built-in sensors will interfere with the add-on sensors. Just screw-on the GMC sensors and try it on the GMC display
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2014 Shamrock 183
2014 RAM 1500 Bighorn Crew Cab, HEMI, 3.21 gears, 8 Spd, 4X4 TST TPMS
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11-29-2020, 10:59 AM
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#10
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Member
Join Date: Sep 2020
Posts: 65
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The new GMC trailer 4T tire sensors are not the type that screw onto the valve stem. Rather, they are valve stems that mount inside of the tire like a normal valve stem.
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11-29-2020, 03:47 PM
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#11
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Senior Member
Join Date: Oct 2020
Location: South Central Virginia
Posts: 882
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Even if the frequency of the two systems are the same they still may not work as the software protocols may be different; I.e. one speaks French but the other only understands English
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11-29-2020, 04:07 PM
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#12
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Senior Member
Join Date: Jul 2017
Location: North of Seattle, WA
Posts: 17,362
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Quote:
Originally Posted by WanderMore
Even if the frequency of the two systems are the same they still may not work as the software protocols may be different; I.e. one speaks French but the other only understands English
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Even if they "spoke English" there are all kinds of variations. US? UK? Australian, or even Southern and Cajun 
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2018 Flagstaff Micro Lite 25BDS
2023 f-150 SCREW XLT 3.5 Ecoboost (The result of a $68,000 oil change  )
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11-29-2020, 04:08 PM
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#13
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Senior Member
Join Date: Oct 2020
Location: South Central Virginia
Posts: 882
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Exactly!
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11-29-2020, 11:22 PM
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#14
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Member
Join Date: Sep 2020
Posts: 65
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Sounds like you were right about speaking different languages. Got an answer from TST Customer Service today... "Because our system is proprietary it unfortunately does not communicate with your GMC. Most of our customers who want to use only 1 screen, add external sensors to their systems so that they can monitor the truck and trailer on the TST display. All 507 sensors are compatible with one another". I'd rather my one screen be the GMC's screen so I will be having the GMC valve stem sensors installed on the trailer.
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