PBrown1

I have a 2020 Silverado and had to have the Trailer Lighting Control Module replaced on the truck. This fixed the running light issue. Prior, only the brake and turn signals worked. Here is the service bulletin: NHTSA Bulletin 20-NA-198 https://static.nhtsa.gov/odi/tsbs/2020/MC-10181721-9999.pdf 2019 Model Year vehicles, equipped with U1D, use the K68 Trailer Lighting Control Module to control all trailer lighting through pulse width modulated (PWM) voltage. The Trailer Lamp Control Module has a current handling capability on the running lamp circuit of about 9 amps. On a trailer with a large number of incandescent lights, in-rush current can exceed 20 amps before it settles back to around 8-9 amps. During this inrush or "marriage" current period, the Trailer Lamp Control Module sees the current as an "overload" and goes into protection mode. This was changed for Model Year 2020 to allow 16 amps of continuous current flow by routing the current through an internal relay in the Trailer Lamp Control Module. 2019 Trucks can be modified to operate in the same way. If we use 2020 design software and re-pin the running lamps to pin 25 using the internal relay to operate the running lamps. This requires a terminated lead to be inserted into cavity 25 on the chassis harness X1 connector. Wiring connected to pin 5 on the X1 will be cut and reconnected to Pin 25. Terminal in cavity 5 will remain, be blunt cut, and sealed with a closed end duraseal splice to prevent water entering through pin 5. Software will have to be managed by TCSC. A record must exist of what trucks have been flashed and that the bulletin has been completed. Software will not work with the production configuration of wiring. This also changes the trailer connection detection flashing of LED lighting from every 10 seconds to every 42 minutes. (Connection detection will still be enabled if trailer theft deterrent is enabled)

Wiring is NOT the problem. You need to take it to the Chevy Dealer and get an update to the Trailer Lighting controller. I had this issue. 12V was not present on the running lights for the trailer. Stop lights and turn signals did work however. I have a 2020 1500 Siverado and they had to swap the controller. Here is the bulletin. NHTSA Bulletin 20-NA-198 https://static.nhtsa.gov/odi/tsbs/2020/MC-10181721-9999.pdf 2019 Model Year vehicles, equipped with U1D, use the K68 Trailer Lighting Control Module to control all trailer lighting through pulse width modulated (PWM) voltage. The Trailer Lamp Control Module has a current handling capability on the running lamp circuit of about 9 amps. On a trailer with a large number of incandescent lights, in-rush current can exceed 20 amps before it settles back to around 8-9 amps. During this inrush or "marriage" current period, the Trailer Lamp Control Module sees the current as an "overload" and goes into protection mode.

I do a tank to tank average. Your dash display appears to be a running average. I fill the tank and note the difference between starting mileage and mileage at fillup. My best highway was 31 mpg. City is typically 23 - 26 MPG. See my attached log. Staying under 75 mph helps big time.

This is the solution from Camera Source... https://www.camerasource.com/factory-digital-mirror-camera-relocation-housing-kit-for-2019-2023-gm-trucks I bought this and it works just like the original camera mounted on the back of the cab.

I have installed this system on my Leer Cap. Check out "Camera Source". It works just like the OEM camera on the back of the cab. All the functionality of the Mirror display will work as well (zoom, Up / down...). Check out their URL: https://www.camerasource.com/automotive-backup-cameras/gm-backup-cameras/factory-digital-mirror-camera-relocation-housing-kit-for-2019-2023-gm-trucks

I have a cap on a 2020 LTZ which covers the rear view video mirror. This does not affect the 360 view. The rear camera on the tail gate is used for this. That said, I would love to move the camera on the back of the cab to the back of my cap. That video rear view mirror is very nice and I miss it.

I have a 2020 Chevy LTZ with a Lear 100XQ. It adds weight but helps aerodynamics. I think it's a wash. That said. I love the extra lockable storage.

I'm looking to do the same for a rear camera mounted on my Lear Truck cap. In my case I probably need to route under the floor. That said I need to find a good location for 12V and ground under my dash. Let me know of any suggestions.

Thanks I'll look into these.

I added a Lear cap to my 2020 Silverado. It rendered my video rear view mirror useless (since it blocks the rear view camera). I am not talking about the backup camera. I'm referring to the one on the inside rear view mirror. Has anyone successfully moved the camera so it could be mounted on the back of a truck cap? I assume the wiring would have to be extended. Thanks

Sounds to me you need to fire the dealer. They should be going to bat for you. GM has Service liassons that handle these issues. The dealer should be talking to them.

I have about 16000 miles on my 3.0L Duramax. So far I love it. I average 22 mpg city and I've gotten 30 mpg hwy (driving 75 mph or less) on numerous occasions. BTW, these numbers are based on tank to tank fill-ups, not the rolling average displayed on the instrument panel. Yes... I'm a bit of a nerd. Bottom line, I think it's pretty darn quick, quiet and very smooth. Lots more torque than a 5.3L (which I borrowed and drove in the past). Since the Duramax has a 100k powertrain warranty (a big plus), I will not do any modifications during the warranty period.

I love my 3.0 as well. I'd be concerned about making mods before 100k miles of powertrain warranty. You could void it.

The 2020 has Wi-Fi but not wireless Carplay. I opted not to pay for Wi-Fi and use my cell phone hot spot if I want Wi-Fi in the truck. I have Verizon and find it's coverage has been very good. You may wish to contact Verizon to check your phone for the latest tower and firmware updates. I suspect that since you are using two cell carriers (cell phone and truck each have their own cell carrier per your note) that both will experience dropouts separate of each other. I bet that Verizon will , at times, work where AT&T drops out.

I took a trip from NC to NY in December. I typically drive 5-9 mph over the speed limit. Here is a true tank to tank mileage log. In mixed city driving the instrument panel typically shows 22-25 mpg. My best mileage occurs when I drive 55 mph. Very happy.