3.0

That would be great but it never completes the install where I live so it just becomes a viscous circle. Therefor the only resolve is a hard download at the dealership 100 miles away.

Got a 2020 3.0 D for the most part love the truck but not a lot of confidence in the engineers who take the bus and/or train to work. This is a heads up for the coming winter on your block heater.The engineers have put a thermostatic head in the male head of their GM specific block heater cord ( the cord is a rip off / 100 bucks if you have to replace it) so if you need to use another extension cord to plug in do not leave the plug head of the gm cord laying on the ground. If the air temp is warmer than -18c the ground may be colder opening the block heater circuit which the motor will see as a heat issue/fault code when you start the motor it will turn on the high fan for 6 hours of run time.The only way to resolve the issue is let the engine run in fan high for 6 hrs or remove the fault code. Gm doesn't think this is a serious issue and has shown no interest in resolving either the cord or heat sync issue so even though it's a pain if you come across this issue call roadside assistance and have them tow the vehicle to the nearest stealer and if it hits their pocket book often enough they will resolve the issue (put the thermostat in the standard male receptacle in the bumper) . Thought for the day ... think of how much more money GM would make if they did it right the first time?

Wondering if anybody knows what to do if your out of cell phone range and you happen to lose your fob. In the good old days use to just carry a spare key in the wallet now what do you do when your 100 miles from civilization it's 40 below outside and you drop your fob in 4 feet of snow. Customer service and the stealer have no response so far in this example of engineers spending HOUR troubleshooting possible scenarios with their fool proof systems. Anybody have a solution?

I live in an area where it will not download properly and I have to take it to the stealer for a proper install.The problem is until I get to the dealer the radio will not work properly even when I push the download later option. They also cannot turn this download feature off just another example of GM engineers spending HOUR of time to work the bugs out of a system they say can't fail LOL

Not an electrician it was parts that told me the male head has a thermostat in it and is why the cord is specific.I do know I had a real issue with plugging in when the temp was bouncing back a forth above and below -18 earlier in Dec and Jan..I would think the best way to check it would be to test it warm and then test it cold and see how it reacts. Your cord head looks smaller than my 20 but could be for any reason.Try plugging it in with another extension cord and keep the male end on ice and see what happens if it was like mine you'll either have to let it sit for 6 hrs. or clear the code.

Let's take our hats off to those really intelligent GM engieers (on purpose) never met an engineer that could spell. The bumper connection is specific and the extension cord is specific (the male end contains a thermostat that is set at -18c). So now if someone borrows your cord you are done until you can find a new cord from your stealer or where ever.... 1day or 1 week or maybe 2 or 3 depending on the post office . Next if you use an extension cord with the original cord make sure the male end doesn't lay on the ground because now the thermostat may think its colder than it is and start setting off another bunch of special issues (you'll find out). The solution is too easy,just build the thermostat into the block heater cord going to the bumper mount keeping it off the ground and away from vandalism,and then have a standard male electrical cord end on the bumper mount DUUUH Homer. So if someone borrows your cord and your wheels won't start make sure and call GM roadside assistance and don't stop calling them until they get you a new cord and they have to keep coming to start you because there are no cords available.Support Your Local Tow Truck CO. :) He may even have a spare cord LOL

Would like to find another block heater cord the works with the bumper plug in or a short converter just so I have a back up.Does anyone know of a supplier?

It sets a code when it happens don't clear it ,they found a sensor and thermostat issue on mine finally

I used a bilstein 2.5 strut in the front and a 0-4 inch rough country and 2" block in the back and got a sold 2.25 inches all around.It is a noticeable difference in ride quality especially on the bigger bumps. I was looking at the southern cal coil over setups which are nice but they are not made for northern climate and just won't hold up to road salt & mud. Not only that but they require regular service which in Canada costs more than the 1 time cost on the bilsteins. To all those going higher than 2 -21/2" good luck as every mechanic I have talked to says the long term costs will get you ie ball joints & cv angles and drive shaft angles (unless you start putting in drop brackets). All in I was just over a grand Canadian and say it was a great buy. The other thing to watch for on a taller lift is the fuel lines on the 3.0 duramax as it's not good for them. Just my .02$

On the 3.0 the block heater works all the time the dealership recommends the truck not be plugged in until temps reach-18c.I did this with mine and the temps warmed up to -12 overnight and when I started the truck the engine fan kicked into high and would not turn off ( apparently has to sit for six hours to stop this problem temporarily) finally convinced dealer of issue and their replacing a sensor and a thermostat. There was a bulletin on the issue but when I posted on the issue I got no feedback so I assume it wasn't a common problem.

Had the same issue with what I'm assuming was a bad download, radio stayed on and door locks were acting weird so I did a battery disconnection and the problem went away for a few days and returned ,as quickly as it returned it disappeared and have had no issues since. Have been told by those in the know that gm's issues with the head unit go back to 17 on some models and they have been waiting over 2 years for a resolution to the problems. I'm going to the dealer to get a hard connect update done, I have no confidence in GM's over the air update system.

I've got the Baby D and when I plug in most times the engine fan cuts in on High and will not shut down the only fix so far is to clear the code or to let the truck sit for 6 hours.Just had it stuck on high yesterday and drove around to see what would happen.The fan would not shut down and the temp gauge was sitting at 1/2 it's normal position.This was at 0 c or 32 f (wonder what would happen at -25c) . Has anybody had this issue and has it been resolved,what was the fix?My service dept and apparently GM say there is no known issue and yes I've seen the GM techlink from dec 2019

From what I've been told it's a connection and of course this is a completely different fuel system from any they previously have used.

So the problem has been found but the resolution may be a long ways away.The issue is a faulty fuel line which caused loss of prime in the fuel filter causing the system shutdown the solution is to replace the faulty parts the realty is the part is on back order for the foreseeable future.It now becomes a waiting game.

I too have owned and driven many diesel trucks ( even dumb enough to through money at performance 6.6 with 700+hp) since the 90's and only once did I have gelled fuel (Alberta -35 ) and the truck still ran for 12 hrs only in limp mode.The dealer that I purchase from since 05 tells me he changes to winter fuel in Oct. and my last tank full before the incident was December so I really hesitant to blame the fuel with all the sensors and a heated fuel line but anything is possible.