New Service Bulletin Addresses Valve Spring Issues In GM V8 Engines
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General Motors has issued a new service bulletin to address the valve spring issues some of its newer V8 engines are experiencing.
GM LT2 V8
The service bulletin indicates that vehicles equipped with certain GM V8 engines may produce a service engine light along with a misfire and strange engine noise. The issues can be linked back to faulty valve springs, with the bulletin instructing the service department to check for a broken valve spring and, if necessary, perform a cylinder leakage test on the cylinder with the broken spring. The bulletin also says that “if no cylinder leakage is observed it will be necessary to replace all valve springs on both banks if the vehicle is built between June 1, 2020 to September 15, 2020.”
GM L8T V8
The bulletin also indicates that the above fix only applies to the following 6.2L GM V8 engines: L87, LT1, LT2 and LT4. For all other current GM V8 engine RPOs (L82, L84 and L8T), the service department is instructed to “just replace the affected valve spring,” and that if they determine there is a cylinder leakage, it “will be necessary to inspect further to determine the extent of the engine damage to determine correct repair required.” GM is also requesting that the service department send back valve springs from affected engines for further inspection.
GM L82 V8
This service bulletin can affect a very large range of current GM vehicles. The LT1 and LT4 V8s are found in the Chevrolet Camaro, while the LT2 V8 powers the Chevrolet Corvette. The L82 and L87 V8s are found in the latest GM full-size truck and SUV models, while the L8T is offered in the Chevrolet Silverado HD and GMC Sierra HD trucks, along with the Chevrolet Express van.
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I just purchased a new 2021 Camaro SS with the 6.2 V8 engine. Before I even took deliver the check engine light came on indicating BAD VALVES SPRINGS, engine had 289 miles on it.
2021 Silverado 1500 5.3 Liter Engine 300 miles, 2 Broken valve springs only replace the 2 that broke,
I asked, what about the others being replaced. Service man said go break the others!
I really don’t like the idea of my truck riding on a tow truck.
Going after my truck in my Toyota Camry with 316k miles.
Hope the truck can make it back, so i think i will take a tow rope.
Truck was built in Nov 2020 so i don’t think the problem is just the dates they have listed.
I purchased a 2021 5.3 Tahoe for my wife 12/31 2020 for an early Birthday present. 724 miles on it now as it sits at the dealership with 2 broke valve springs. Build date is 12/10/20. My 2019 6.2 company truck is at the dealership with 48,000 miles for its second camshaft and lifters. I own a 2020 HD2500 6.6 gas motor to tow my racecar trailer. I wont drive this truck again until i put a set of valve springs in it. Absolutely pathetic on GM’s part.
I’m still holding my breath. I bought my 2021 GMC Yukon XL Denali on 12/5/20. It was built in late November. I have about 750 miles on it. I don’t think there is really an amount of mileage where you can consider yourself “safe”, from the valve spring issue. Not to mention all the other things that have happened, to GMC’s built in the last quarter of 2020.
You would think, with spending this much money on a vehicle, you would be able to feel “safe” driving it. Instead of feeling like it may/will die, at any moment.
Update. Dealer ordered a brand new motor, we will see how long this one lasts.
What’s pathetic is, this should be a recall! Not let’s wait until our customer is stranded on the side of the road/service bulletin. I personally think it’s DFM causing these problems and I’m going to be disabling it! Stranded once and they replaced 1 valve spring, instead of all 16. I will never buy another GM product after this!
Yep my 2020 Sierra with the 6.2 crapped out with 32,000 miles on it supposed to put new motor in not sure how long this will take.
I have a 2011 Silverado Z71 and mine was not the valve springs alone. The DOD (displacement on demand) is what went bad had to year down complete engine and replace the cam lifters timing chain and gears. It was a pain because I had to redo the computer because I did a DOD delete. Best thing I ever done. But not covered under warranty. General Motors had known about this problem but did nothing about it. Meant people just replaced engines for about 5000 my cost was around 2500. I did my own labor. Wish I could have gotten help with my cost but was told that just happens