Key facts
| Item | Value |
|---|---|
| Investigation | EA26005, Engineering Analysis |
| Opened | 2026-08-20 (upgraded from Recall Query RQ26001, opened 2026-01-16) |
| Manufacturer | General Motors, LLC |
| Component | Engine |
| Subject | "Loss of motive power due to engine failure post recall remedy" |
| Model years | 2021–2026 |
| Nameplates | 9 (Silverado 1500, Tahoe, Suburban, Suburban 1500, Sierra 1500, Yukon, Yukon XL, Escalade, Escalade ESV) |
| Post-remedy failure complaints (ODI) | 499 — 473 after oil viscosity change, 26 after engine replacement |
| Post-remedy failure complaints (GM's own count) | 6,953 |
| Failures outside the recall production window | 191 |
| Underlying recall | 25V-274, received 2025-04-24, 597,571 vehicles |
| Completion rate of that recall | 85.06% (NHTSA recall file, retrieved 2026-08-12) |
| Recall attached to EA26005 | None as of 2026-08-22 |
What exactly did NHTSA open, and why is it different from a recall?
EA26005 is a remedy-effectiveness investigation: it takes a repair that has already been performed on most of a 597,571-vehicle fleet and asks whether it worked. That is a rarer and more consequential thing than a normal defect probe, because the usual consumer advice — "check for open recalls, get them done" — has already been followed by the owners now complaining.
The sequence on NHTSA's own record:
- 2025-04-24 — GM files recall 25V-274 for engine failure in L87 engines built 2021-03-01 through 2024-05-31, citing "a supplier manufacturing and quality issue" as root cause.
- 2026-01-16 — ODI opens Recall Query RQ26001 to assess the remedy's effectiveness after complaints arrive from owners whose recall work was already done.
- 2026-08-20 — ODI upgrades to Engineering Analysis EA26005 and expands the scope to include engines built after the recall's production window.
An Engineering Analysis is the last investigative stage before NHTSA can press for a recall. It is not a finding that a defect exists.
How many engines actually failed after being "fixed"?
499, by NHTSA's count — but GM's own count is 6,953. Both numbers come from the same ODI opening summary, and the 14-fold gap is the most striking thing in the document. Manufacturers see warranty claims and dealer repair orders; NHTSA sees only what owners take the trouble to file. The gap is a reminder that complaint counts are a floor, never a rate.
The 499 splits in a way that matters to a buyer:
| Remedy the vehicle received | Post-remedy failures logged by ODI |
|---|---|
| Oil viscosity change (0W-20 → 0W-40) | 473 |
| Complete engine replacement | 26 |
| Total | 499 |
Do not read that table as "the oil change is 18× worse than a new engine." Almost all repaired vehicles got the oil change — engines were only replaced if they failed GM's inspection — so the denominators are wildly different and NHTSA does not publish them. What the split does establish is that the failures are concentrated in the cheap remedy, which is the one most used trucks on the market received.
A separate 191 reports involve L87 engines built after 25V-274's production window closed. Those are not post-remedy failures at all; they are the reason ODI widened the scope. Several outlets have added 499 + 191 and reported "690 post-remedy failures." That is a misjoin — the two numbers count different things.
Which used trucks and SUVs are actually in scope?
The investigation covers the naturally aspirated 6.2L V8 (RPO L87) in model years 2021–2026:
| Brand | Nameplates in EA26005 |
|---|---|
| Chevrolet | Silverado 1500, Tahoe, Suburban, Suburban 1500 |
| GMC | Sierra 1500, Yukon, Yukon XL |
| Cadillac | Escalade, Escalade ESV |
Not in scope: the 5.3L V8, the 2.7L turbo four, the 3.0L Duramax diesel, heavy-duty 2500/3500 trucks, and the supercharged LT4/LT5. On a used lot, the 6.2L is usually the top trim's engine — High Country, Denali, Escalade generally, and the badge or window sticker is the fastest tell. Confirm with the VIN's build data rather than the badge.
What a Zilocar VIN check can and cannot tell you here
This story sits directly on the line between what vehicle history data covers and what it does not, so it is worth being exact.
A VIN check can tell you:
- Whether the vehicle falls under an open recall campaign, and how many recalls it carries
- Accident and damage records, including airbag-deployment events
- Odometer readings and rollback indicators
- Salvage and junk auction records
- Theft records (NICB)
- Ownership history and sales-listing history
- Specs, NHTSA and IIHS ratings, and a valuation
A VIN check cannot tell you:
- Whether the recall remedy was actually performed on that VIN
- Which of the two remedies it received — the oil change or the engine replacement
- That an NHTSA investigation such as EA26005 or RQ26001 exists or applies
- Anything about the engine's internal condition or oil-change history
For the three things this story turns on — remedy status, remedy type, and investigation exposure — go to nhtsa.gov/recalls with the VIN (free, and it reports repair status) and to a GM dealer, who can read the VIN's warranty and service history and tell you which repair was billed. Use the history report for the things it is genuinely authoritative on: whether this specific truck has been wrecked, flood-touched, clocked, or run through a salvage auction, which no recall database will ever tell you.
Is this a reason to walk away from a used 6.2L?
No — it is a reason to shift the price and the paperwork. Roughly 508,000 of these engines have been through the remedy and the overwhelming majority have not been reported as failing. Concretely, before you buy:
- Ask which remedy the VIN got, and get it in writing. Oil change or engine replacement is the single most useful fact about the truck. A documented engine replacement is arguably a plus — it is a new long block.
- Check the recall status at nhtsa.gov/recalls yourself. Do not rely on the seller's word or on a history report's recall count.
- Get a pre-purchase inspection that includes an oil analysis. Metal in the oil is the practical early warning; the L87's known failure mode is bearing-related and it tends to arrive without much notice.
- Confirm the remaining powertrain warranty. GM's is 5 years/60,000 miles from original in-service date and it transfers. On a 2021 truck that coverage is expiring now, which changes the risk materially.
- Ask whether 0W-40 is actually in the sump and whether the owner kept to it. The remedy is only a remedy if it was maintained.
- Run the history separately. An engine investigation tells you nothing about whether the truck has been in a crash or sat in an auction lane as a total loss.
Does the 85% completion rate make this better or worse?
Worse, in one specific sense. A normal open recall is a to-do item: unrepaired vehicles are the exposed ones, and the fix is free and available. Here the exposure runs the other way — the repair has already been applied to about 508,000 of 597,571 vehicles, so "recall completed" is the normal state of a used L87 on the market today, and it is precisely that state EA26005 is questioning.
It also means a clean recall check is weaker evidence than it looks. A truck showing "no open recalls" for 25V-274 is a truck that got the oil-viscosity remedy — the one associated with 473 of the 499 reports.
