General Motors overhauled its full-size SUV lineup with a range of fresh next-generation models, all of which were introduced for the 2021 model year. Now, however, the automaker has issued a new TSB (Technical Service Bulletin) that addresses a potential issue related to the engine oil cooler lines on the 2021 Chevy Tahoe, Suburban, GMC Yukon, and Yukon XL.
The bulletin was issued last month, and states that some of the full-size SUV models could have one to two engine oil cooler lines that are not fully seated into the quick connect at the radiator.
Affected vehicles include the following:
The TSB was issued specifically for vehicles in dealer inventory. Dealers are instructed to inspect the engine oil cooler lines at the quick connector on the radiator in order to ensure they are properly seated before selling or dealer-trading the vehicle.
No parts are required for the fix. However, catastrophic engine failure can occur if the oil cooler line is not properly seated. There are a total of two lines to check.
This TSB applies to both of the gas-powered engines offered in the 2021 Chevy Tahoe, 2021 Chevy Suburban, 2021 GMC Yukon, and 2021 GMC Yukon XL, including the naturally aspirated 5.3L V8 L84, and the naturally aspirated 6.2L V8 L87.
Most of the vehicles this TSB applies to are in dealer inventory. The fix should be done by the dealer prior to the dealer delivering the vehicles.
All four full-size SUVs affected by this TSB enter a new generation for the 2021 model year. All four ride on the new GM T1 platform, and are produced by GM USA at the GM Arlington plant in Arlington, Texas.
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Comments
Simple oversight or deliberate mis-conduction needs to be asked; one has to wonder whether the engine oil cooler lines of other GM engines need to be examined.
Same thing happened with my 2014 Silverado and the trans cooler lines. That was a recall though instead of a TSB.
I’m sure the other lines need to be examined.
My 2020 Sierra Denali purchased in May had a loose Lower oil connector where it attached to the radiator. Discovered the leak a couple of days after picking it up and took 3 trips to the dealer to get it repaired.
It all boils down to somebody not properly doing their job on the assembly line.
These are SUPPLIED to GM from a 3rd party manufacturer. They have nothing to do with GM assembly line workers.
@ Hodge.
According to the article, it doesn’t appear to involve a defective part. The TSB says the line may not be properly seated so it sounds like a problem at the manufacturing level.
@ Hodge
Its an assembly line issue, not a cooler line issue. Somewhere on the line when the engine and cooling systems are mated together, the oil lines aren’t being properly attached to the radiator.
I’d bet $$ that its because GM is trying to pump these out to catch up on them that things might be moving a little above normal production speed.
If you don’t want to pay attention to your job go flip burgers. You have no business earning union scale if you can’t be bothered to insert a peg into a hole.
Dang Gm act like u haven’t started building vehicles yesterday they need better quality control
Most likely subs filling-in for an individual either afflicted with COVID-19 or filling-in for someone who is COVID-19-averse. Team leaders on the assembly line are harried in situations such as what we are seeing in Texas with its COVID-19 activity.
That sort of thing is not supposed to make it out of the installer’s footprint/workstation.
I’ve said it before GM quality has gone straight down the tubes !! Yes, this part does come from a 3rd party manufactuer but it should be checked before installing it into the vehicle. I can see why Ram and Ford is tops in sale and customer satisfaction.
@steve
Its the install that is the problem, not the 3rd party vendor who supplies the lines. They are all attached to the radiator on the assembly line during vehicle assembly.
I was going to buy the new taboe but after all these issue. I will wait until the spring.
According to JD Power your last statement is false.
Just looked at the window sticker of a 2021 Tahoe High Country here in S.D. that topped out at $80,353. Now a TSB already? This is why one waits at least a year after the intro of a new model year so the “bugs”can be worked out..Shame on GM.
All these vehicles are still on dealer lots, and being taken care of before being put in consumer hands.
That’s why you have Warranty! You don’t think ford and ram don’t have issues! Wake up ! Go buy a ford ! Did you know ford donated 8.3 million to blm !
Standard first year blues. This is why you don’t by the first vehicles off the line, regardless of manufacturer.
Just bought Premier, So far after 300 miles.. I have Air bag service light/message/beep on, Intermittent Radio cut out (last until i turn car off for awhile) and front windshield fluid not working. Love the it otherwise..lol