2019 GMC AT4 with new wheels from 2021, tpms sensor problems

bcato · February 12, 2022

So I have a 2019 AT4 that originally came with the 18" rims and Duratracs. I recently acquired a set of the 20" rims/tires from a new AT4 - these were new truck take offs at the dealer. Before getting the new 20" rims/tires, I verified that I had the XL8 part number meaning everything should still be using the 433mhz sensors. I bolted up the new rims/tires, put the truck in the Learn mode, used my little wake up tool on the new sensors but the truck never reads them. I can roll one of the old 18" rims up beside it, put the truck back in learn mode, and wake up with the tool and the truck reads the old one just fine. What am I missing? Is there something with the ID of the sensors, do I have to tell the truck to use these four new ID's or something? Thanks in advance.

Edited February 13, 2022 by bcato

mafd2 · February 13, 2022

Weird... The '21 uses 433 as well. Does the horn chirp when you relearn the 18"?

Silverado4x4 · February 13, 2022

16 hours ago, bcato said:

So I have a 2019 AT4 that originally came with the 18" rims and Duratracs. I recently acquired a set of the 20" rims/tires from a new AT4 - these were new truck take offs at the dealer. Before getting the new 20" rims/tires, I verified that I had the XL8 part number meaning everything should still be using the 433mhz sensors. I bolted up the new rims/tires, put the truck in the Learn mode, used my little wake up tool on the new sensors but the truck never reads them. I can roll one of the old 18" rims up beside it, put the truck back in learn mode, and wake up with the tool and the truck reads the old one just fine. What am I missing? Is there something with the ID of the sensors, do I have to tell the truck to use these four new ID's or something? Thanks in advance.

You dont have the old 18" tires in the area close to the truck do you? If you do the truck could still be seeing the old tire sensors and not allowing you to reprogram to the other set of tires. One other thing is did you drive with the new 20" tires yet? When the truck is sitting the sensors go to sleep and don't wake up till its driven, at least that's what I have read. Take the truck out for a short drive and try it again and make sure the old tires are far away from the truck.

bcato · February 13, 2022

Yes, I drove it about 25 miles then tried out the relearn procedure. Almost 20 miles into the drive the truck alarmed me that the TPMS system needed service - then just dashes appeared where the tire pressures are usually displayed on the dash. First attempt at "re-learn" the old wheels/tires were stacked about 10 feet away behind my side-by-side and I noticed the drivers rear was still receiving that signal (close proximity). I moved them all away and tried the new sensors again, several times.

After researching and thinking this through, it makes sense to me that the working four sensors HAVE to be registered in the computer (or BCM?) because driving down the road, or a parking lot full of other GM 433mhz sensors, the trucks' receiver would be picking up multiple signals. Seems to reason that the truck would have to be instructed (re-programmed) to ONLY listen for these 4 new sensors and mute out all the others. After rotations, you just help it understand (re-learn) which of the 4 corners each sensor is now located.

I think I need a "reprogram" procedure along with the "relearn" procedure. Question is can a tire shop do this or do I have to surrender to the dealer.

Edited February 13, 2022 by bcato

bcato · February 13, 2022

11 hours ago, mafd2 said:

Weird... The '21 uses 433 as well. Does the horn chirp when you relearn the 18"?

Yessir, the double chirp to begin, then the single chirp if I relearn the 18" rim. Honestly, I think relearn is only for repositioning the sensors -- I believe the truck is looking for the original 18" with sensors and ignoring my new ones.

mafd2 · February 13, 2022

27 minutes ago, bcato said:

Yessir, the double chirp to begin, then the single chirp if I relearn the 18" rim. Honestly, I think relearn is only for repositioning the sensors -- I believe the truck is looking for the original 18" with sensors and ignoring my new ones.

I've put different wheels and sensors and they had to be re learned.

Silverado4x4 · February 13, 2022

The sensors put out a frequency that is fixed no programming in the BCM for the sensors no ID. Are you doing the relearn right, left front, right front, right rear, left rear? I always hold the tool at the tire and not the rim on the tire part and are you sure the sensors are in the tires? Someone may have removed them at the dealer you said they were bought from and put them in the other tires.

If it were me I would go back to the dealer and tell them the issue you are having, I kinda think the sensors have been removed and regular valve stems installed.

Edited February 13, 2022 by Silverado4x4

bcato · February 13, 2022

4 hours ago, Silverado4x4 said:

The sensors put out a frequency that is fixed no programming in the BCM for the sensors no ID. Are you doing the relearn right, left front, right front, right rear, left rear? I always hold the tool at the tire and not the rim on the tire part and are you sure the sensors are in the tires? Someone may have removed them at the dealer you said they were bought from and put them in the other tires.

If it were me I would go back to the dealer and tell them the issue you are having, I kinda think the sensors have been removed and regular valve stems installed.

Yep, using the correct order for the wheels. I tried all angles on the tool... at the sidewall, stem, every possible way I could think. I also had that thought about regular valve stems, so I removed a valve core and stuck a small wire in there. It stops about 1-1/2" in, a regular valve stem would be open. I have a tpms sensor diagnostic tool coming, I will be able to verify the frequency (if any) coming from the new 20" wheels, then compare to my original 18" wheels - to see if they match. I know my 2019 is supposed to be 433mhz, but it was a transition year and it was an early 2019 model. My luck.. the truck may be listening for 315mhz. I'll know a lot more very soon. FYI - I did not buy the wheels/tires directly from the dealer. There is a guy locally that buys the new truck take-off's from the dealers and resells them. He had stacks of wheels, tires, lug nuts, etc. It seems that with low supply the dealers are dressing a few of the trucks they have up with accessories (lifts, larger tires/wheels, etc) and making some money that way. I saw the same activity when I was shopping for side-by-side's last fall - I didn't want one with all the accessories....

Edited February 13, 2022 by bcato

Silverado4x4 · February 13, 2022

Double post deleted

Edited February 13, 2022 by Silverado4x4

Silverado4x4 · February 13, 2022

1 hour ago, bcato said:

Yep, using the correct order for the wheels. I tried all angles on the tool... at the sidewall, stem, every possible way I could think. I also had that thought about regular valve stems, so I removed a valve core and stuck a small wire in there. It stops about 1-1/2" in, a regular valve stem would be open. I have a tpms sensor diagnostic tool coming, I will be able to verify the frequency (if any) coming from the new 20" wheels, then compare to my original 18" wheels - to see if they match. I know my 2019 is supposed to be 433mhz, but it was a transition year and it was an early 2019 model. My luck.. the truck may be listening for 315mhz. I'll know a lot more very soon. FYI - I did not buy the wheels/tires directly from the dealer. There is a guy locally that buys the new truck take-off's from the dealers and resells them. He had stacks of wheels, tires, lug nuts, etc. It seems that with low supply the dealers are dressing a few of the trucks they have up with accessories (lifts, larger tires/wheels, etc) and making some money that way. I saw the same activity when I was shopping for side-by-side's last fall - I didn't want one with all the accessories....

Ok I gottcha, I don't know what tool you have but I have the JDiag EL-50448 bought from Amazon and it transmits both 315 and 433mhz.

bcato · February 14, 2022

40 minutes ago, Silverado4x4 said:

Ok I gottcha, I don't know what tool you have but I have the JDiag EL-50448 bought from Amazon and it transmits both 315 and 433mhz.

I also have one of the EL-50448 tools that transmits on both frequencies, no luck with these newer 20" wheels [yet]. Using this tool, the older 18" wheels wake up and communicate with the truck no problems. That could support that the truck may be listening on 315mhz (assuming the 20's have sensors using 433mhz), but I can't prove that just yet. That could also support the notion that there is no sensor at all transmitting from the new 20" wheels. I have an ATEQ tool on the way that will detect the frequency used (if any). If neither frequency is being transmitted, I'll break one of the sidewalls down and visually inspect. I'll post up my findings.

bcato · February 19, 2022

Ok, so I have more information. I rec'd my ATEQ tool which requires me to select my vehicle, and I was able to scan and read the sensor information from my original 18" wheels no problem (433mhz as expected). I could not scan the newer 20" wheels and I had a hunch there might be no sensors. Went to the tire shop, they used their Autel MaxiTPMS scanner, they could not read the sensors either. They broke a sidewall down and verified they do in fact have the tpms sensors:

I googled the part numbers and I can see this is a factory part for 2021 Yukons, Suburbans, and Escalade.

I took my ATEQ tool, selected 2021 for either of those models, then the new sensors trigger and I can scan them. No year earlier, no combination of Sierra or Silverado works either.

I have emailed ATEQ support for ideas, but I'm guessing something significant has changed for these sensors. Two options for relearning:

1) Manual - activate the relearn process from the truck menu and to trigger the sensors in order. I had no luck, I had the truck in relearn mode (two horn beeps), when I trigger the sensor with the tool, I don't get the single horn beep like I should.

2) Auto - I'm not comfortable trying at this time because it programs the ECU with settings for a different vehicle selected in my ATEQ Tool. I'd like to hear from support first. It triggers, loads the sensor ID's by position, and uploads via the ODB port.

gemarsh · February 19, 2022

Yeah, those don't look like the one's in my wheels. I know it's not my money, but I would buy new for 28 dollars each.

bcato · February 19, 2022

11 hours ago, gemarsh said:

Yeah, those don't look like the one's in my wheels. I know it's not my money, but I would buy new for 28 dollars each.

That is exactly what I'm gonna do. I found another thread on here last night to a gm-techlink article. The new 2021 GM suv's use a different sensor, and that part number above shows for suburbans, yukons, escalades. Sierra's in 2021 were not using it. So, now I know.

silveradosid · August 4, 2022

i have a 2020 rst with sensors 84961888 433 mhz , and i just bought new take offs from a 2022 refresh that has sensors 13542523 that are also 433mhz, i still dont understand why the new wheel wont register, they both broadcast the same frequency