NCPGMC

Since they replaced my head unit, I have not had any problem with it. That being said, its not my daily driver at the moment. I have driven it maybe 6 times and have not had any issue. Before being replaced, it would do it almost every startup.

I would do some more "testing" before spending money on refrigerant. Other than putting some gauges on it, try putting yourself in the same scenario of idling in the the sun but bump it down to "LOW." I guess if it were me I would have turned the temp down while sitting to get it cooler in the cab. I usually keep mine around 70 or so most time but if I find myself sitting in the sun I drop it down for cooler air. Stick an instant read thermometer into the vent with it running and see what the temp is coming out of the vents.

Got mine back from the dealership today. Here is the service comments they provided. There is a new plastic film over the touchscreen so I assume they replaced the whole head unit. I hope this works but some have reported that this did not fix it. I know a parts manager at another dealership and he said the Cadillac units were bad for doing all of the described behaviors, but he was surprised a GMC unit was doing it. I would assume they were basically all the same...

I have a 2017 Sierra at the dealership now getting warranty work for the exact same issue...touch not working, then icons moving around themselves, the radio info popping over to the DIC by itself, and I keep hearing the touch sound like someone is touching the screen. They told me they had to order a part and it will be ready tomorrow. I will post the results tomorrow and I hope it works.

Sorry, when I get to talking about stuff like that I switch to the jargon...You usually dont see officer's pulling people over for registration violations in other states...it is not really an NC violation if a PA license is expired...

Here in NC it is all tied to the tag, i.e. license plate...officer runs the tag and the DMV status comes back (inspection, insurance, annual registration, etc.). The officer doesn't need to stop the driver to run the tag and any hits like failure to register, no insurance, no inspection give the officer RAS to stop the car.

It seems odd to have two separate stickers for safety inspection and emissions inspection. In NC both emissions and safety are done simulataenous and tied to the vehicle registration (as well as the weight), thus, no stickers. I think a safety inspection here is like $14 and emissions is $30. Only 22 counties out of 100 here require emissions.

What do all of these stickers represent? I see the "Class 2" is for weight i guess, what are the other two for? We don't do window stickers in NC, did away with them 10 years ago...

I believe it is No. 2 on the driver side; it's a 10A fuse (SEO/Retained Accessory Power)

It is all explained on page 1! It took you longer to become a member and register and then post your stupid question than it did to just simply read the 6th post in the thread...Good Grief!

Pages 18-19... https://www.agrrmag.com/digital/2010/NovDec2010.pdf

I found 14 TSB's related to that code...Are you having any other conditions or codes at the same time? A little more information might help the folks on the forum here to think about what your problem is...

They are built on the USB 2.0 standards and they are probably only operating on 0.5A. The manual says that they are not for charging but for data transfer from HDD, flash drives, and the like. While 0.5A is pretty anemic, it is enough to run an HDD or a flash drive. I cannot find anywhere what charging standard they are operating under, if it is 1.2 then the USB should be rated for 1.5A. What radio RPO code does your truck have?

I think that was the recall that was issued in Canada...no word on the US though. https://www.autoblog.com/2019/07/12/chevrolet-silverado-gmc-sierra-defroster-circuit-recall/

To the original question about "Service Theft Deterrent System" From the manual, here is a start...