ArrowsmithPML

You have bad quality DEF in the tank. Often it will go away when Temps warm up. If it doesn't, the tank will need to get drained.

You will be walking sooner than you think. You either fix (in some cases there is a warranty issue) or you rip it out and potentially get into other issues.

Diesels make all sorts of noise in the cold. But around -2 C / 30 F there shouldn't be any significant noise with the exception of the wrong fluids, lose filters (check the air filter seat and housing) and the fuel pump and filter (on the frame rail below the fuel filler location). These trucks need to be plugged in at -10 C to ensure the DEF tank doesn't freeze. I plug my '21 in for nearly 4 months straight but...

Yes. For both my 21 Yukon 3.0L and my 21 6.6L dmax. Dealer says no parts and we will call you.

Got the recall for my 3L yukon but not my 6.6L

What's wrong with it or do you know? I have a 2021 AT4 3500 and I've all sorts of DEF issues (mostly due to cold weather) but otherwise it's been pretty good.

Generally speaking, 10% of trailer. Then consider your payload. Then it depends on country and state/province and license and all that "stuff".

Hi, First off, although I do find it silly to save the environment, 1 jug at a time, the system does generally work ok. My issues are the repeated cold weather failures, regardless of tank fluid levels, being plugged in, having working heater elements etc. GM doesn't seem to under that this is their design problem and that owners like me are serious considering fixing it and in the process voiding warranties. I'm frustrated.

Find the part number from AC Delco and then do a cross match.

I've never had any problems with refueling in the cold. Usually the fuel gels up at -40 and your truck never shuts off. In slightly warmer periods, day-20C the retailer may give you a hard time. Sometimes fuel islands will issues you warnings too. The process is actually safe enough.

My 21 Yukon XL 3.0L Duramax has shuddered a few times with the auto stop/start when it restarts. I swear it is the torque converter. I have it going in on Wednesday so we will see what they find.

So at about -10 C and especially if I left I left the truck for a bit parked I would plug it in. Although not certain, my guess is that the transmission fluid and or oil sump and the associated circulation is cold and or not working. Just my initial thoughts.

Well if you build your own like me, they don't carry load as the relay does that. The relays in my case are under the hood and the switches trigger the relay.

Perhaps the $10k is high but in general operating costs are lower (maintenance can be costly) and even if fuel is more than regular you still get longer range, better efficiency and all kinds of other things I'm sure you've heard.

Yup... it sure does.