Let's talk TPMS for my RV and what I did to get it to work.

chopjaw · February 28

Since the 2024s are different in many ways from the 2020-2023 series trucks. I had to find and figure out the TPMS for my trailer through the pain of learning and of course, money...

From what I found, there are 2 versions of TPMS sensors for the trailer and both have the same part number. The part number is 86803857

These sensors are in 2 different configs with the same part number - 4T and 4T+ The 4T comes with the truck - in the glove box when delivered on the first-gen 2024s (if you have this option.) These TMPS sensors only go up to 102psi. GM then came out with version 2 of these sensors = 4T+ and this TPMS goes to 150psi.

If you go to the dealership to get them, check them cause both sensors have the same part number. As we know the parts counter at most dealerships are not the sharpest guys so chances are, they know nothing. I know this because of a very frustrating process that I had to go through. If your parts counter guys are on the ball, then good for you...:) Something else, buying from GM these sensors come with a 2yr warranty. If you buy from eBay or someplace else then you don't get the warranty. I wanted the warranty option because when I'm out with the RV, chances are, a dealership will have the sensors if I need to replace one.

I am old enough to know that I hate breaking tires down. So I took my trailer to Discount Tire and had them install the sensors for me. Now I had to do this twice. WHY? Because I had the 4T sensors with 4t+ on the RV tires - didn't know the difference yet... After doing all 6 tires and 4 of them reporting closely to 110psi and 2 of them reporting 102psi, I had to pull them and look at the sensor. That's when I found out the difference. Then going back to the stealership and asking them to check for the correct TPMS (4T+) and they had them. The parts counter guy was shocked because all of the sensors with the PN: 86803857 were in the same package but different sensors. Luckly the guy was cool and swapped the ones I needed. Back to Discount Tire.... After getting them installed we had to get them assigned in the truck display for my trailer. That was an official ******-Show. We tried for over an hour and could not get it to work with their TPMS tool. So I left pretty frustrated.

Got home and decided to do the "manual" method that GM gives you on the display. I deleted the saved trailer from trying at Discount and started a new trailer and did the manual method. That is, air down/up the tires and let the system do the configuring. BOOM it worked like a champ. In fact it was a fast process and one that I suggest all you do. No need to buy the tool (IMHO).

Here is a pic of the trailer and sensors.

May be an image of text that says 'Dune Sport 38 Tires 110psi 88°F 115psi psi 90°F 114psi psi 95 OF 117 psi 93 °F 114 psi 97°F 116psi psi 93 OF シ0'

Each tire was set to the correct RV tire pressure - 110psi. During the process, the tires were giving me crazy numbers that didn't match the pressure I put in the tires. I had to drive around for a bit and monitor them. After 5miles or so they started to get better. I am assuming that when driving for longer times the sensors will work better and more accuratly.

My next plan is to drive with the RV attached for about 20 miles or so and then check the pressure the sensors give me on the truck display to what is actually in the tire so if they are off then I at-least know what that value is.

In the end, I know the 4T+ sensors work for the higher psi tires that some of us need. I hope this info helps you.

Chop.

sealberta · February 29

Something that I learned is watch the temperatures. I had one that was quite hot and 3 much cooler. The brakes were not adjusted right. The hot tire the brakes were way too tight and the 3 cool ones were barely providing any braking force. Once all 4 were adjusted correctly the braking of the trailer was dramatically improved and lower the temp on that one hot wheel.

chopjaw · February 29

2 hours ago, sealberta said:

Something that I learned is watch the temperatures. I had one that was quite hot and 3 much cooler. The brakes were not adjusted right. The hot tire the brakes were way too tight and the 3 cool ones were barely providing any braking force. Once all 4 were adjusted correctly the braking of the trailer was dramatically improved and lower the temp on that one hot wheel.

Good to know. I will be also watching that.