Can you light up the tires in Sport Mode?
I still had a dead pedal in sport mode on the 3.0.
6.2 Blew Up: Decision Time - Keep or Buy?
- Thread starter Alpinglow
- Start date
I still had a dead pedal in sport mode on the 3.0.
Alpinglow
New member
Ha. My tire lighting days are over...but I take your point.Can you light up the tires in Sport Mode?
I still had a dead pedal in sport mode on the 3.0.
Fletcher
Active member
Fletcher
Active member
Does anyone have any estimates on what percentage 6.2s are bad
Fletcher
Active member
Or is GM keeping this a secret
I have heard 1 out of every 150 sold. That came from GM mechanic. Who knows.
Fletcher
Active member
If that’s accurate i guess GM feels.75% is ok
The BEAST
Member
These two points are what I’ve read on GMC blogs and have heard (first hand) from a local GMC Dealer - General Manager.
1) During COVID, GMC used their Government Assistance “COVID money” to continue to build vehicles, resulted in tens of thousands of vehicles being parked, sat for months at a time, in the Mexican sun.
2) At some point, due to supply chain issues and closing down assembly lines. Parts, were stored in shipping containers, (in the HOT Mexican sun) for well over 12 months. For example… this caused warping, so that upper and lower motor, no longer fit flush to each other, causing head gaskets to leak and lifter problems. This issue has contributed to valve, piston and head problems, eventually becoming catastrophic motor failures.
2020, 2021 and 2022 models can trace a majority of their recalls, back to these two root causes.
His advice… stay away from purchasing one of these vehicles.
Because of this… (the soul reason why) I ordered my 2022 GMC 1500 AT4X CUSTOM. Which resulted in, being moved and built on the CUSTOM assembly line. (NOT the general assembly line)
I know this because I ordered a custom WHITE body, 2022 AT4X. There were thousands of WHITE 1500 Sierra bodies. (Ready for assembly) I was able to track, my truck the entire 12 months from order to delivery. Which made sure, the motor, transmission and major components were, delivered to the custom assembly line, as “just in time” supply chain, and NOT having been pieced together after sitting in a storage container, (for 12 - 18 months) getting warped. (Including: Rubber hose, gaskets and belt failures)
This is a plausible explanation for the higher than normal, rates of GM failures.
Alpinglow
New member
Yea, not sure how much I'd trust this answer. My At4 was a 2019 but I bought it in late 2018. It was definitely the first ever AT4 that my dealer sold and they told me at the time that it was the first one delivered in all of New England. That was long before the pandemic. I've also seen guys posting on the Facebook AT4 forum that their 2023's are blowing up. The dealerships are trying to downplay this because they are stuck with a ton of 6.2s in inventory and they can't get rid of them. GM Corporate has no official statement on this, but they are facing multiple class action lawsuits and must be bleeding money in warranty replacements. This is a big deal and I'm pretty sure it is an issue with the lifter design combined with the cylinder deactivation system they are using for fuel management.
All that being said, I think you are fine buying a 6.2L ... just know your factory warranty terms and make sure you buy an extended warranty if you are going to exceed them.
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Up here in Ontario, Canada not seeing too many new 24' AT4's on the lot in inventory, however a tonne of Denali's at some dealers. The 3.0 Duramax is extremely popular up here and can be somewhat difficult to find, especially if you're after a unique/rare color. A shame that this B.S. is still going on, even with some newer 23' models, scary to see if even some 24' models are having lifter failure. Spoke with a service writer/advisor the other day as I'm hoping to get an AT4 but most likely with the 3.0 Dmax...asked if the lifter and crank bearing failures are over exaggerated or if it's the truth ? His answer : " if it wasn't true I'd be out of a job. Not every single one is failing but we are seeing them happen. " If indeed the AFM or DFM is the root cause of this, I can't see this being resolved unless they do away with this sort of technology. Just my honest opinion.
I have the 3.0 LZ0 and have about 4500 miles on it. Within the first 1500 miles I had to check engine lights, both were for the NOX sensor, there are two of them. It has been great since then and you can drive with a bad NOX sensor it just decreases your fuel mileage. I drove from Holbrook AZ to Sierra Vista AZ, 337 miles, on half a tank of diesel. It is the best on fuel mileage. It is not the fastest for passing when you are at highway speed but it gets the job done. In town I average about 22 MPG when it is not in REGEN. I love this motor. I had a thought of trading in mine for a 2024 AT4X AEV edition but the dealership only has them in the 6.2 and I have never heard anything good about them minus the power.
Here's what I would do in your scenario. You're getting a brand new engine. Why go buy essentially the same thing only to get a diesel? Take the brand new engine and find yourself a reputable shop that'll perform an AFM + VVT delete. You'll bullet proof yourself, won't go into anymore debt and have a brand new engine.
I recently did AFM/vvt on my 2011 with the 5.3. after tuning, it is night and day. Drives like a brand new vehicle.
I recently did AFM/vvt on my 2011 with the 5.3. after tuning, it is night and day. Drives like a brand new vehicle.
Thanks for your comments. More and more people I speak with love their 3.0 Duramax , especially the fuel economy. I’m sure lots of folks have had there share of problems with the emissions systems but for the most part don’t run into many people that are unhappy with this powertrain choice. Cheers
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