2021 GMC Sierra 1500 · keep 3 yr

Configuration unresolved · configuration-scoped issues are withheld, never guessed.

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2021 GMC Sierra 1500 — Image: Own work · CC0

BuyEvidence: Medium confidence

Evidence supports proceeding with a normal independent inspection.

Main regret risk

No named issue intersects your stated window.

Safer move

No published alternative improves on this supported verdict.

Open inspection brief See what would change this answer

Configuration applicability

Unresolved · not yet pinned

This model year was built in 0 reviewed configurations; configuration-scoped findings can differ between them.

To verify: Enter the VIN, or read the engine/drivetrain from the door-jamb label or window sticker, to pin the exact configuration.

Ownership headache outlook

The stated ownership horizon enters the observed band for Loss Of Motive Power Due To Engine Failure investigation; this is a scenario band, not a failure probability.

Most inspection-relevant: Loss Of Motive Power Due To Engine Failure investigation — this is the issue to focus the pre-purchase inspection on.

What each horizon reaches

1 yrAbout 12,000 mi — before every named onset band.
3 yr (yours)About 36,000 mi — reaches the observed onset band for Loss Of Motive Power Due To Engine Failure investigation, which your window is inside.
5 yrAbout 60,000 mi — reaches the observed onset band for Loss Of Motive Power Due To Engine Failure investigation, which your window is inside.

12,000 annual miles · 3-year ownership horizon · Service history is unknown unless verified by the buyer. These are observed report bands, not failure probabilities.

Ownership-headache outlook: observed onset bands for each named issue.
Issue	Severity	Onset p25	Median	Onset p75	Relation to your window
Loss Of Motive Power Due To Engine Failure investigation	Moderate severity	15,500 mi	50,000 mi	62,568 mi	Your window enters the onset band

Why this answer

1No serious applicable issue intersects the stated ownership horizon, and required evidence coverage is adequate.

Conditions to clear first

Loss Of Motive Power Due To Engine Failure investigation: Check the VIN for open NHTSA actions, then ask the inspector to test the named system and document the result.

Loss Of Motive Power Due To Engine Failure investigation

official investigation record

Moderate severity

Whole generationSingle sourceEvidence: Medium confidence

The cited record is bound to model year 2021; no broader incidence claim is made.

Symptom: Loss of motive power due to engine failure The Office of Defects Investigation (ODI) has received 1,157 reports of engine bearing failure failures in the L87 6.2L engine produced by General Motors (GM).
Why it matters: The official record identifies a condition that deserves candidate-specific inspection and record verification.

Observed complaint mileage band; not an incidence probability

Reported onset roughly 15,500–62,568 mi (median 50,000 mi).

Your window enters the onset band.

Based on 10 usable reports (10 censored). Complaint mileage is an observed report band, not a population incidence estimate.

What to inspect

Check the VIN for open NHTSA actions, then ask the inspector to test the named system and document the result.

Pro check: Independent pre-purchase inspection.

Mitigation

Treat the official record as a targeted inspection lead, not proof that this candidate has the condition.

1 evidence receiptShow ▾

clm_gmc-sierra-1500-2021-investigation-investigation-ea25007-obs-38352021 GMC Sierra 1500Evidence: Medium confidence

The official record identifies a condition that deserves candidate-specific inspection and record verification.

“Loss of motive power due to engine failure The Office of Defects Investigation (ODI) has received 1,157 reports of engine bearing failure failures in the L87 6.2L engine produced by General Motors (GM). Of the 1,157 reports received, 173 are outside of the scope of recall 25V-274. These engines are installed in Model Years (MY) 2019–2024 Chevrolet Silverado 1500 and GMC Sierra 1500, and 2021-2024MY Chevrolet Suburban and Tahoe, GMC Yukon/Yukon XL, and Cadillac Escalade/Escalade ESV vehicles. The subject engine failures were investigated as part of a Preliminary Evaluation (PE25001). GM determined that these engine failures were due to multiple supplier manufacturing and quality issues. GM issued recall 25V-274 to address the supplier manufacturing and quality issues produced between March 1, 2021, and May 31, 2024. Based on the issuance of recall 25V-274, NHTSA has closed PE25001. ODI continues to receive a significant number of reports of engine failure in vehicles outside the scope of 25V-274. This presents a potential safety risk that warrants further investigation. ODI is opening this Engineering Analysis (EA) to further evaluate the scope and severity of the potential problem and to fully assess the potential safety-related issues of vehicles built outside the recall scope. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.”

NHTSAinvestigationOct 2025Open source record

What would change this answer

verified remedy

A newly verified completed remedy with configuration-specific eligibility for Loss Of Motive Power Due To Engine Failure investigation could improve the recommendation.

clm_gmc-sierra-1500-2021-investigation-investigation-ea25007-obs-3835

contradictory source

A reviewed official or independent source that materially contradicts the claims for Loss Of Motive Power Due To Engine Failure investigation would force confidence and verdict review.

clm_gmc-sierra-1500-2021-investigation-investigation-ea25007-obs-3835

changed applicability

Reviewed evidence that includes or excludes a different year, engine, drivetrain, trim, or VIN population would change which issues apply.

clm_gmc-sierra-1500-2021-investigation-investigation-ea25007-obs-3835

lost exposure eligibility

A verified production denominator and eligible time-at-risk cohort are required before normalized comparative year guidance can strengthen.

clm_gmc-sierra-1500-2021-investigation-investigation-ea25007-obs-3835

Applied assumptions

· 12,000 annual miles
· 3-year ownership horizon
· Service history is unknown unless verified by the buyer.

Sharpen it further

Add mileage — it places the onset bands against your ownership window.
Add the asking price — it weighs the findings against what you would pay.
Set your annual miles — assumed 12,000; it sizes the window.
Choose a horizon — assumed 3 years; it sets the window length.

Better options

Chevrolet Silverado 1500

2020

Buy

Evidence: Medium confidence

Direct full-size pickup alternative

Evidence decision: buy with medium confidence.
Price, repair-cost, and exposure-normalized deltas are unavailable and are not estimated.

Chevrolet Silverado 1500

2021

Buy

Evidence: Medium confidence

Direct full-size pickup alternative

Evidence decision: buy with medium confidence.
Price, repair-cost, and exposure-normalized deltas are unavailable and are not estimated.

GMC Sierra 1500

2020

Buy

Evidence: Medium confidence

Adjacent year in the same model line

Evidence decision: buy with medium confidence.
Price, repair-cost, and exposure-normalized deltas are unavailable and are not estimated.

Inspection brief

Mark each check as you go. Progress saves on this device, works offline, and prints cleanly.

Saved on this device — no account needed. Copy link shares the safe URL only (no price, risk, or VIN).

Mark the checks to see where they point: a single Walk away outweighs the rest.

Required checks

Check the VIN for open NHTSA actions, then ask the inspector to test the named system and document the result.
Loss Of Motive Power Due To Engine Failure investigation: Loss of motive power due to engine failure The Office of Defects Investigation (ODI) has received 1,157 reports of engine bearing failure failures in the L87 6.2L engine produced by General Motors (GM).
Passes when: No matching symptom during inspection
Test drive: On the test drive, watch for: loss of motive power due to engine failure the office of defects investigation (odi) has received 1,157 reports of engine bearing failure failures in the l87 6.2l engine produced by general motors (gm)..
Specialist: Independent pre-purchase inspection
Records to request: Service records showing this system was inspected or repaired
clm_gmc-sierra-1500-2021-investigation-investigation-ea25007-obs-3835
Pass / Concern / Walk away

Ask the seller

Has any named issue here ever been diagnosed or repaired on this car?
Can I see the maintenance and any recall-remedy records?
Will you allow an independent pre-purchase inspection?

Records to request

Service and oil-change history
Completed recall / campaign paperwork
Any dealer diagnostic reports

Full evidence

Every conclusion above traces to one of these source records.

clm_gmc-sierra-1500-2021-investigation-investigation-ea25007-obs-38352021 GMC Sierra 1500Evidence: Medium confidence

The official record identifies a condition that deserves candidate-specific inspection and record verification.

“Loss of motive power due to engine failure The Office of Defects Investigation (ODI) has received 1,157 reports of engine bearing failure failures in the L87 6.2L engine produced by General Motors (GM). Of the 1,157 reports received, 173 are outside of the scope of recall 25V-274. These engines are installed in Model Years (MY) 2019–2024 Chevrolet Silverado 1500 and GMC Sierra 1500, and 2021-2024MY Chevrolet Suburban and Tahoe, GMC Yukon/Yukon XL, and Cadillac Escalade/Escalade ESV vehicles. The subject engine failures were investigated as part of a Preliminary Evaluation (PE25001). GM determined that these engine failures were due to multiple supplier manufacturing and quality issues. GM issued recall 25V-274 to address the supplier manufacturing and quality issues produced between March 1, 2021, and May 31, 2024. Based on the issuance of recall 25V-274, NHTSA has closed PE25001. ODI continues to receive a significant number of reports of engine failure in vehicles outside the scope of 25V-274. This presents a potential safety risk that warrants further investigation. ODI is opening this Engineering Analysis (EA) to further evaluate the scope and severity of the potential problem and to fully assess the potential safety-related issues of vehicles built outside the recall scope. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.”

NHTSAinvestigationOct 2025Open source record

What we could not verify

Every dimension is listed — including the ones we do not have — each with the concrete next step to close it.

ConfigurationNot verified
This model year was built in 0 reviewed configurations; configuration-scoped findings can differ between them.
Next: Enter the VIN, or read the engine/drivetrain from the door-jamb label or window sticker, to pin the exact configuration.
VIN recall & historyNot verified
A VIN recall check was not handed to this page, so recall status and title/odometer history for this exact car are unchecked.
Next: Run this VIN on NHTSA’s recall lookup and request a title/history report to confirm open recalls and past events.
Repair costNot verified
No sourced repair-cost range is available for the named issues in this release.
Next: Get a written repair estimate for the named issue from an independent shop before you negotiate.
Market price contextNot verified
No asking price was entered and no licensed market-value feed is integrated, so price fairness is not assessed.
Next: Compare the asking price against recent local listings for the same year and configuration.
Onset evidencePartial
Onset bands rest on a limited number of usable reports; treat the band edges as approximate.
Next: Weigh the onset band as a reported-onset range, not a failure probability, and confirm condition by inspection.

Coverage & methodology

Evidence: Medium confidence— Enough evidence to decide; some sources are thin or single-origin.

5 of 5 expected sources present · methodology m1-v4-authority-cohort.

· Public complaints and recalls do not estimate failure probability.
· Observed mileage bands describe reported onset only.

Methodology m1-v4-authority-cohort →

2021 model-year authority Generation guide

Edit your inputs

Change a value and re-run — the answer updates and highlights what moved.