6.6 gas having big issues too per my contacts and acquaintances at GM dealers... Just priced one for a guy with a 2020 2500hd with 130k...meticulous maint record, cam/lifter failure with piston to valve contact...You can buy a brand spanking new long block from GM for under $2500...the catch is there is a $7k core charge. Im told this is typical practice when GM is eating alot of them under warranty and wants to reduce costs and needs cores to rebuild.
Safety recall locks out 8-10 gears preventing the lockup, not sure how extensive the repair will be but I’d assume it’ll be covered under warranty and then after might be converted under the recall.
It’s not a normal issue, I’ve had zero issue at -13*.
Before you go to the 6.2 research the big failures it’s had.
Hopefully my 21 stays rock solid, at almost 71k, no def issues to date.
Same with my 20 at 125k, no def issues and no cold issues. It sits out in Wisconsin winters and hasn't been plugged in once.
6.6l gas is basically a 6.2l with larger bore and longer stroke...otherwise the same and having same issues from what I've been able to gather short of the more prolific crank failures the 6.2 has had. That being said it seems most of those have been at lower miles and under warranty and I've not personally seen one yet just been told about it by dealer connections.
products of one kind or another...but GM has been really bad in my personal experience the last 15+years and not gotten any better. Just seen too many major failures and stupid problems across the board at under 100k miles. Some folks have better luck than others, but I wouldnt own anything GM truck/suv wise newer than 2006 short of and l5p with the 6spd Allison.
Danmitall... lifelong Chevy guy here but I've been pretty underwhelmed with my 6.6 Duramax (2019, 140k miles - think that's the L5P). Even left me stranded once with three kids, a puppy, and wife - fuel injector went out on a road trip, 90k miles. That was fun. I had a few in the late 90s and early 2000s that were bulletproof. Whish I still had em. Never thought I'd admit this but I'm contacting a few Ford dealers about the 3/4T 6.8L gasser.6.6l gas is basically a 6.2l with larger bore and longer stroke...otherwise the same and having same issues from what I've been able to gather short of the more prolific crank failures the 6.2 has had. That being said it seems most of those have been at lower miles and under warranty and I've not personally seen one yet just been told about it by dealer connections.
Id hope they corrected the cause on on replacement engines.
Only seen a few 6.6l out of warranty thus far. Last one was classic GM lifter failure at 130k so thats still a thing on the 6.6l
That one had alot a fuel in the crankcase, but no codes stored yet related to that. All the GM direct injection v8 engines have issues with fuel leaking past shaft seal of the high pressure fuel pump into crank case. It will set codes once bad enough but until then it's just putting gasoline in your oil...you can be the judge of whether or not that sounds healthy for an engine that's already prone to lifters seizing in the bore and lifter rollers failing and wiping out camshafts
I dont like to hate on any one manufacturer. They all put out
The L5P has been solid in the 3/4 and 1 ton trucks but the jury is out on the "Allison" 10spd...(nothing Allison about that trans short of them taking a fat check from GM to stamp their name on it) The 3/4 and 1ton diesel trucks seem to be their last saving grace, but parts supply issues and emmissions control system failures are still common there.
I dont know what to tell people to buy for a truck anymore. Long term quality has taken such a dump across the board. It just seems GM has had alot more major powertrain issues at lower mileage than the other options...other than Toyota...they can take that new twin turbo v6 of theirs and stick it where the sun don't shine... still breaks my heart to see how bad they ruined the tundra
