General Motors’ troubled 6.2-liter L87 V8 is back under federal scrutiny, and this time the issue isn’t simply engines that failed before being repaired.
Some engines are reportedly failing after owners already completed GM’s recall remedy.
The National Highway Traffic Safety Administration has escalated its investigation into the L87 to an Engineering Analysis, covering an estimated 997,743 GM trucks and SUVs from the 2021–2026 model years. Regulators are examining whether GM’s original recall remedy adequately addressed the underlying engine-failure problem and whether newer engines produced outside the original recall window may also be affected.
For owners of a Chevrolet Silverado, Tahoe or Suburban, GMC Sierra or Yukon, or Cadillac Escalade equipped with the 6.2L V8, that’s the part worth paying attention to.
This is no longer simply:
“Was my truck recalled?”
The increasingly important question is:
“Could my L87 still fail after the recall work was completed?”
What Is Wrong With GM’s 6.2L L87 V8?
The underlying problem involves potentially serious internal engine manufacturing defects.
GM’s investigation identified supplier manufacturing and quality problems including rod-bearing damage associated with sediment on connecting rods and crankshaft oil galleries, along with crankshafts that could have out-of-specification dimensions or surface finish.
These aren’t minor drivability defects.
An internal bearing, connecting-rod or crankshaft problem can ultimately result in severe engine damage, seizure and sudden loss of propulsion.
That’s why NHTSA became involved.
The agency initially investigated complaints involving sudden loss of motive power in vehicles equipped with the L87 6.2L V8.
GM Recalled Nearly 600,000 Vehicles in 2025
GM eventually issued Recall 25V-274, covering approximately 597,630 trucks and SUVs equipped with potentially affected L87 engines.
The original suspect engine-production period ran from March 1, 2021 through May 31, 2024.
The recall covered certain:
- 2021–2024 Cadillac Escalade and Escalade ESV
- 2021–2024 Chevrolet Silverado 1500
- 2021–2024 Chevrolet Tahoe
- 2021–2024 Chevrolet Suburban
- 2021–2024 GMC Sierra 1500
- 2021–2024 GMC Yukon and Yukon XL
But here’s where things become considerably more interesting.
What Was GM’s L87 Recall Fix?
The recall didn’t automatically give every affected truck a new engine.
Dealers inspected the vehicles to determine whether the engine showed signs that warranted repair or replacement.
Engines that passed the inspection received an oil change using higher-viscosity engine oil, along with associated service changes.
Engines that failed the inspection could require repair or replacement.
And that’s now at the center of the new federal investigation.
Because engines reportedly continued failing.
499 Complaints Involve Engines That Failed After the Recall Remedy
NHTSA says it has received 499 complaints alleging engine failure after the recall remedy had already been completed.
Of those:
473 involved vehicles that received the oil-related remedy.
More concerning:
26 reportedly involved vehicles that had received replacement engines.
That second number is small compared with the overall vehicle population, but it’s important.
Replacing an engine is supposed to be the big hammer.
If replacement engines are also appearing in post-remedy complaints, regulators understandably want to know exactly what’s happening.
GM Reportedly Has Nearly 7,000 Post-Remedy Complaints
The federal complaint count isn’t the largest number in the investigation.
According to NHTSA’s investigation information, GM reported receiving 6,953 complaints involving alleged post-remedy engine failures.
That doesn’t mean 6,953 engines have been conclusively proven to contain the same manufacturing defect.
Complaints are not the same thing as confirmed defect cases.
But nearly 7,000 reports are more than enough to make regulators ask whether the original remedy actually solved the problem.
And Now 2025 and 2026 L87 Engines Are Under Investigation
Here’s the development owners of newer GM trucks should watch most closely.
NHTSA has also received 191 reports involving L87 engines produced after the manufacturing period covered by the original recall.
That’s significant because the original suspect production period ended May 31, 2024.
The new Engineering Analysis expands the investigation to engines produced afterward, bringing 2025 and 2026 model-year vehicles into the federal investigation.
That does not mean every 2025 or 2026 L87 is defective.
It also does not mean GM has recalled nearly one million vehicles.
It means NHTSA is investigating a population of approximately 997,743 vehicles to determine whether the existing recall remedy was adequate and whether the scope of the defect needs to expand.
That distinction matters.
Which Vehicles Are Now Under Investigation?
The broader Engineering Analysis covers certain 2021–2026 vehicles equipped with the 6.2L L87 V8, including:
| Make | Model | Investigation Years |
|---|---|---|
| Cadillac | Escalade | 2021–2026 |
| Cadillac | Escalade ESV | 2021–2026 |
| Chevrolet | Silverado 1500 | 2021–2026 |
| Chevrolet | Suburban | 2021–2026* |
| Chevrolet | Tahoe | 2021–2026 |
| GMC | Sierra 1500 | 2021–2026 |
| GMC | Yukon | 2021–2026 |
| GMC | Yukon XL | 2021–2026 |
The federal investigation includes 2021–2024 Suburban and 2025–2026 Suburban 1500 listings.
Again, this is an investigation population, not a new recall covering every vehicle in the table.
How Serious Can an L87 Failure Be?
Potentially very serious.
A bearing or crankshaft failure isn’t comparable to a bad sensor causing a Check Engine light.
If internal engine damage progresses far enough, the engine can seize or stop producing power.
The original federal investigation specifically focused on loss of motive power due to engine failure.
GM’s earlier defect analysis identified 28,102 potentially related field complaints or incidents, along with reports involving crashes and injuries.
That safety aspect is why the issue became a federal recall rather than merely an extended-warranty headache.
What Should GM 6.2L Owners Watch For?
Owners shouldn’t assume every unusual noise means their L87 is about to grenade itself.
But unusual mechanical symptoms deserve attention, particularly if they appear suddenly.
Watch for:
- Engine knocking
- Metallic tapping or pounding
- Low oil-pressure warning
- Sudden vibration
- Rough running
- Check Engine light
- Reduced engine power
- Metal contamination in the oil
- Sudden loss of power
- Engine seizure or inability to restart
If your engine develops a new mechanical knock, don’t just increase the stereo volume until the warranty expires.
Pro Street’s Car Symptoms Encyclopedia can help owners distinguish between common drivability symptoms and problems that warrant immediate diagnosis.
Should You Keep Driving an L87 That’s Knocking?
A new heavy mechanical knock combined with oil-pressure problems or other severe symptoms should be treated seriously.
Continuing to operate an engine with bearing damage can turn a developing internal problem into catastrophic engine failure.
Pro Street’s When Should You Stop Driving Your Car? provides additional guidance on symptoms that warrant shutting a vehicle down rather than attempting to limp it home.
When in doubt with an L87 already exhibiting severe mechanical symptoms, having the vehicle inspected or towed is cheaper than discovering how far a connecting rod can travel without the rest of the engine.
What If Your L87 Already Received the Recall Repair?
This is where the current investigation becomes especially relevant.
Having the recall performed does not necessarily mean you should ignore new engine symptoms.
NHTSA’s new Engineering Analysis exists specifically because regulators received reports of failures after recall remedies were completed.
Owners should keep documentation showing:
- Recall completion
- Dealer inspection
- Oil changes
- Engine replacement, if applicable
- Repair orders
- Engine-related complaints
- Warning lights
- Dates and mileage when symptoms occurred
If the vehicle received a replacement engine, retain documentation identifying when and why the replacement occurred.
Check Your VIN — Don’t Guess From the Model
Not every Silverado, Sierra, Tahoe, Yukon or Escalade uses the L87.
And not every L87-equipped vehicle was included in the original recall.
Owners should check the actual VIN through the official NHTSA Vehicle Recall Lookup.
That’s substantially more reliable than trying to determine recall eligibility from trim badges, Reddit comments or your neighbor Steve, who “used to work on these.”
Is There a New GM 6.2L Recall Yet?
As of August 24, 2026, no new recall covering all approximately 997,743 vehicles in the Engineering Analysis has been announced.
The federal investigation is ongoing.
NHTSA’s Engineering Analysis is intended to determine whether the existing remedy adequately addresses the safety defect and whether additional vehicles or corrective actions may be necessary.
Possible outcomes could eventually include additional manufacturer action, an expanded recall, another remedy or closure of the investigation if regulators determine further action isn’t warranted.
Right now, none of those outcomes should be treated as predetermined.
Why This Investigation Matters Beyond the Original Recall
The biggest development isn’t simply that the government found more complaints.
It’s where those complaints are coming from.
NHTSA is now looking at:
Engines that failed after receiving the oil-related recall remedy.
Vehicles that reportedly failed after receiving replacement engines.
Engines manufactured after the original recall production window.
Together, those issues raise a much broader question:
Did the original L87 recall fully identify and correct the underlying problem?
That’s what Engineering Analysis EA26005 is designed to determine.
For the technical background and complete vehicle scope, see our earlier report: NHTSA Expands GM 6.2L L87 Engine-Failure Probe to Nearly 1 Million Vehicles.
The Bottom Line
The GM 6.2L L87 story isn’t finished.
GM originally recalled nearly 600,000 trucks and SUVs because manufacturing defects involving connecting rods, bearings and crankshafts could result in engine damage and failure.
Now NHTSA is investigating nearly one million vehicles after receiving hundreds of post-remedy complaints and additional reports involving engines manufactured outside the original recall window. GM itself reported thousands of post-remedy complaints to regulators.
That does not mean every L87 is going to fail.
It does mean owners shouldn’t assume the issue disappeared simply because their vehicle passed the recall inspection or received the prescribed remedy.
If you own an L87-powered Silverado, Sierra, Tahoe, Suburban, Yukon or Escalade, check your VIN, retain your service records and pay attention to new mechanical symptoms.
We’ll continue following the investigation as NHTSA determines whether GM’s original fix was actually enough.