tgivanoff

I also just experienced the issue of my 2021 silverado 3.0l duramax not starting. It currently has 12040 miles on it. I drove about 40 miles stopped at the grocery store for about 20 minutes and when I tried to start it the motor cranked but did not start. I repeated my attempt to start about 10 times with the same results. I also tried shifting to neutral and perform a start but all efforts failed. I then called the dealership for a tow. after the truck was dropped off at the dealers it started. no codes set so I got the call to "Come pick up my $55000 truck there is nothing wrong with your truck" answer. I went ballistic but kept my cool. then I googled the question 3.0 duramax won't start and here I am! Fortunately the dealership has another serviceman with common sense who stopped me from taking the truck till he has it checked out more than the no codes set issue.

Take a look at the 2020 and 2021 1500 silverados. There are a lot of trucks out there with a drastic noticable difference in alignment on usually the drivers side. You will find the bed of the truck driver side is 1/4 to 3/4 inches higher than the cab. It also may stick out on one side more than the other between the bed and the cab. This is due to miss alignment at the factory. I have it on my 2021 1500 and i have seen it on several others. It truly is a manufacture error. I want to know if anyone has gotten it corrected by GM? I took mine to the dealer and they said it is within manufacture specs. HELP....

I have notice on my 2021 silverado 3.0 duramax that the def consumption really increases with trailering. I have hauled a 7000# travel trailer 2000 miles and experienced consumption at a rate of around 2.5 gallons per 400 miles travel. My mileage while hauling is at 12.5mpg. This is half of my usual mpg as when i am not pulling a trailer i average 24 to 29 mpg. A month before i traveled 3000 miles not hauling and went through less than 3 gallons of def. The other problem i have found is that i get warnings of 779 miles remaining before i run out of def but the def green gauge shows full. Any idea if i have a problem with these issues? Any recall notices?

I agree with following the advise given above for break in but i have always felt that the oil is the center of care for the engine. It suspends all contaminants in the lubrication side of the engine. I always change oil earlier than recommended. I understand some engines have break in oil and i leave the oil in at new until i hit 3000 miles. At that point i change the oil and filter and install synthetic oil. By the way you need to use dexosD, yes dexosD oil in this engine. The reason for this early change is that a new engine has junk in it with sealants that fall off joints or metal shavings, or other lubricants that were installed with bearings or metal rust preventative to prevent new parts internal to the engine from rusting before they are installed into the engine. And let us not forget about dirt and dust. So after 3000 i want fresh oil in and contaminated oil out. I believe it is a safe thing to do and cheap even at the cost of this expensive oil.

I just completed a draining of the fuel filter to clean out some water in the fuel. It was scarey but really easy in the end. You need a #40 torx driver to open the drain on the cartrifgmmdge housing. It is located in the bottom of the housing. The owners manual supplemental instructions. Once you have done it you will realize it is really easy to do. Also when you change the fuel filter you will need a 6 point 36mm socket to remove and re install the filter cartridge.

Really, i find the requirements for DEF to be pretty clear as a mixture of 32 percent urea to 68 percent distilled water. There is no real reason for extreme high prices versus extreme low prices unless it has been tampered with or just a scam. Just by a known manufacture and you should be ok.