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Probably an electrical issue?…… The whole vehicle is electrical !!
Died at 70mph on I-75
- Thread starter schmit55
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If the dealer “fixes” the problem, … but the problem returns, from my past experience with dealers, when you bring it back for the same problem, THE SECOND TIME, the specific problem becomes covered without a milage or calendar limit.
( Then they REALLY try to fix it ?? )
I read the fine print in my warranty book….. it was a consumer protection clause, they don’t volunteer to explain in person...
Hopefully, that clause is still in force, after these years, when I had a warranty back in 1989.
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Welcome to this forum ! I’m sure you will receive some good information here.
There is an on-going thread about that….. also.
Apparently not
2024 White Tahoe
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Almost identical story here with a 6.2 with only 5600 miles on it. Exact same dash messages. This one in Canada
Sadly the engine was toast
I posted about it on here on another thread earlier this year.
Good luck and sorry this happened to you as well.
Cancel OnStar. Get AAA instead. I'm glad you're all right.
My story doesn’t get much better. After replacing the entire truck with a 2025 Tahoe High Country 3.0 Diesel , brand new , 1 month old …it ended up in the shop from Jan 23 to March 10. Suspension module failure and a glow plug failure . Two visits to get repaired properly. Knock on wood it’s ok now.
66 Galaxie
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May 6.2 Died in a similar manner with wife and 4 kids in the car. Just got it back up with a new motor and my fingers crossed. Total down time about 4-weeks.
LEsoftballdad
Member
No, they are still junk, and with the new engines coming out in 2027, don't expect them to be fixed. There are also serious known issues with the 10-speed transmissions and their valve bodies. Those are so bad that some dealerships are contracting with Next Gen Drivetrains to provide the fix.
I just got back from a trip to Florida for a few days, and I put 500 miles on a 2025 Ford Expedition Active with the 3.5 Eco-Boost engine. Not only did it drive much better than my 2024 Yukon SLT with the 3.0 Duramax, but the seats are also 100Xs more comfortable. I am currently on the lookout for a 2025 Expedition with the Platinum trim to get cooled seats. I am done with this GM junk.
Vehicle model year and mileage when your engine failure occurred?
Did you fill out a NHTSA Safety Complaint? If not, please do this online as it may help the community in the long run.
Was it a 2026 model year?
Jetskier77
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But they're not, and given the cost of these new trucks - its inexcusable.
As expected, sorry to hear about this. Please make sure to fill out the NHTSA Safety Defect form online.
https://www.nhtsa.gov/report-a-safety-problem
If you could get the dealer to pull an oil sample from the engine and give it to you, it would be worth sending it in for analysis to see if the oil viscosity has sheared and/or if there is a high level of fuel in the oil. Costs about $45.
https://www.nhtsa.gov/report-a-safety-problem
If you could get the dealer to pull an oil sample from the engine and give it to you, it would be worth sending it in for analysis to see if the oil viscosity has sheared and/or if there is a high level of fuel in the oil. Costs about $45.
66 Galaxie
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Thanks for the follow up and registering a NHTSA safety complaint. Sorry to hear about your situation and clearly the Pico test and oil viscosity change did not solve anything. Had you performed an oil change since the Pico test?
I have not run 0W20 in my engine since before 500 miles. I change my oil about every 3700 miles. Oil samples have been performed and it appears that even in under 4k miles the 0W40 is shearing below the expected viscosity window for 0W40, however, it is still above a 5W30 viscosity. Engine wear metals look good, but I do not trust the oil samples 100% because of what I have seen in my oil filters and what I have seen in a number of 2025 model oil filters. What is caught in the oil filters does not show up in the oil sample testing!!! Would be interesting to see what happens to the 0W40 viscosity at 7500-8000 miles, but I am never going to run it that long. I would also like to see what the 0W20 viscosity looks like at 7500-8000 miles.
Kind of scary there appears to be 3 mileage windows of 6.2l failures
Before 8,000 miles, usually on the factory or original oil fill
8,000-20,000 miles many fail between 12-15k miles, unclear what goes on in this window
Over 30,000 miles, typically 45,000+ miles. You would think if the engine makes it past 20,000-25,000 miles it should be fine assuming the oil does not shear or become fuel diluted.
The big difference between the 5.3 L84 and the 6.2l L87 is the amount of torque the 6.2l L87 puts out, how the TCM (Transmission Control Module) loads and lugs the 6.2l L87 and the 6.2l has a 2 stage electrically controlled oil pump where the 5.3l L84 does not have the 2 stage electrically controlled oil pump. The 5.3l L84 tends to run higher oil pressure at the lower highway cruise RPM where the 6.2l is heavily loaded due to the TCM (Transmission Control Module) programming that holds the gears longer and runs the peak loading up far more than than the 5.3l in the same vehicle at a lower oil pressure. It appears the 6.2l L87 2nd stage oil pump or higher pressure does not kick in until around 3,000 RPM and the 6.2l L87 rarely runs above 2,000 RPM under normal highway driving conditions.
All in the name of fuel economy and I do not think a single purchaser of one of these 6,000 lb bricks expected decent fuel economy. I would rather pay more for fuel than have 1 or more low mileage engine failures! Even if GM is paying for the repairs, I have ZERO interest in an engine failure on the highway while traveling.
I guess the 80,000+ mile failures GM will just say your problem, your dime?? So sad.
275,000 miles on my 6.0l Vortec LQ4 in my 2005 Yukon Denali even with the oil pickup O-ring that has shrunk and cracked and the engine starts with no/low oil pressure but gets better once warmed up. Still driving it on 6+ hour trips with the bad oil pump O-ring! Engine still going strong even with this oiling problem. I have the parts and hope to drop the oil pan in the next 30 days to replace the $5 O-ring that is 20 years old and solve the oil pressure problem and hope to get another 100k+ on that engine.
Things have changed a lot in 20 years!!
Bigwales
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What a horrible thing to happen!! Wow!
My 2026 Tahoe HC 6.2 now has 3500 miles. Oil changed at 500 miles and 2200 miles…next change at 4000 miles. Sample sent in at 2200 miles and for all future oil changes.
I still want to know how many 6.2L engines were sold in NA for each year, starting at 2020.
My mfg date is 9/2025
0W20 dealer only changes. $89 which is cheap for northern Illinois!
My 2026 Tahoe HC 6.2 now has 3500 miles. Oil changed at 500 miles and 2200 miles…next change at 4000 miles. Sample sent in at 2200 miles and for all future oil changes.
I still want to know how many 6.2L engines were sold in NA for each year, starting at 2020.
My mfg date is 9/2025
0W20 dealer only changes. $89 which is cheap for northern Illinois!
