elag

Add the kicker sub it makes huge improvement on the Bose system.

Kind of hoping it doesn't take 6 months to get the new radio. But the back order probably means there's a lot of radios being replaced and new ones are being made with the problems fixed so we aren't getting exactly the same problems in the replacement radios.

Ok so time to move on with this topic please. As the OP stated there does seem to be a problem with the radios in the 2020's. With mine the music on USB flash drive worked. Then it randomly stopped working and displayed "No Device Connected". Tried other flash drives and other formats with no luck. Took it to the dealer and they said it was ok. But all they did was test the port for power. Because it still didn't work. So I asked to try it in another 2020. They said yes. It worked. So they admitted there was an issue with my radio. They agreed to replace the radio and ordered a new one. Other problem I had with the radio was not recognizing the trailer connected. Trailering app either said no trailer connected or completely black screen. Other times it worked perfectly. Hopefully the new radio will fix the issue. Still waiting for it to arrive. He said a week or two for the part. One week has passed.

Yes you can mix OEM and aftermarket. But to be clear these sensors are blank and need to be programmed. Any tire shop should be able to do them for you. Program them as a 2020 Sierra/Silverado at 433Mhz. Other option is check dealer for sensors for your truck. The trailer sensors are exactly the same. Betting they're cheaper as the trailer sensor is marketed as specialty item with jacked up prices.

There are relays behind the gas/brake peddles. They will click a few minutes after you turn the engine off.

I hear it in mine all the time if I sit in it while it's off. There's a couple of relays behind the gas/brake peddles. They usually click a few minutes after you shut the engine off. Think they control park lights or something. Almost sounds like a mouse under the dash.

So I've been reading these forums for a few days now. The GM Trailer TPMS sensors are ridiculously over priced. Average $100 each Canadian or $70 each US. So I tested the sensors on my truck (2020 Sierra SLT) and found out they switched the sensors to 433Mhz. I thought if I try programming a blank sensor for a 2020 Sierra (433Mhz) it might read as trailer sensor. Sure enough it worked. So I got 3 more Autel MX 433/315 programmable sensors and programmed them for a 2020 Sierra. Took them out to the trailer and did the setup. Every thing works perfectly. Price for Autel MX 433/315 is $30 US each on Amazon. Any tire shop can program them for you if you don't have the tool. Be sure not to clone the ones on your truck instead do auto program. ID numbers have to be different. Other Brand 433Mhz programmable sensors should work too. But this is what I used and can confirm works.