The 2023 Tahoe 6.2L engine is failing suddenly and without warning across a broad mileage range. Owners report the engine seizing, stopping cold in active lanes, and refusing to restart—sometimes on busy interstates during rush hour. The vehicle's inability to shift to neutral manually when the engine is dead has trapped owners in roadways, creating life-threatening situations. No check-engine lights or oil-pressure warnings appear before most failures; they come afterward or not at all.
Engine noises—deep metallic knocking, rapping, and tapping from the block—precede many failures, but some owners experience sudden shutdown with zero advance warning. Several owners report excessive oil consumption between oil changes, with no low-oil alert.
The official recall (25V-274000) issued June 2025 requires inspection and an oil-change to 0W-40. However, dozens of owners have passed this inspection, received the remedy, and then had their engines fail weeks or months later. The recall remedy does not prevent rod-bearing or crankshaft failures. Repair requires engine replacement, but GM parts are on extended backorder—dealers estimate 2–3 months or longer with no firm ETA. Owners are left paying rental-car costs (capped at $44/day, with taxes and insurance not covered) while their vehicles sit awaiting parts that may not arrive for half a year. GM has denied buybacks and offered no additional compensation for the delay or the original failure itself.
Failure modes owners describe
Engine seizure or sudden loss of propulsion at highway speeds
Engine stops abruptly without warning while driving, often at highway speeds and in heavy traffic. Vehicle goes into neutral or fails to restart. Owners consistently report no warning lights before failure, making the incident a serious safety hazard—vehicles stranded in active lanes, unable to be pushed (neutral unavailable when engine off), risking rear-end collisions.
When: Typically 10,000–82,000 miles; many failures clustered around 16,500–46,000 miles. Several occur months after passing the recall inspection.
Symptoms owners cite: Engine shuts down without warning while driving; Vehicle shifts into neutral involuntarily; No warning lights or dashboard indicators before failure; Vehicle will not restart after stalling; Check engine light may come on after failure; Loss of propulsion at highway speed
Codes mentioned: Check engine light (post-failure only, no pre-warning), Low oil pressure warning (post-failure), Spun main bearing, Connecting rod bearing seizure
Repairs/costs cited: Requires full engine replacement. Parts on extended backorder with no ETA in many cases. Owners report 2–3 month waits or longer. Some dealers quote $21,296.51+ for repair/replacement.
Recalls/TSBs owners mention: Recall 25V-274000 issued for 6.2L engines; remedy is inspection, oil change to 0W-40, new oil cap. Multiple owners report passing the inspection and subsequently experiencing catastrophic failure. GM refuses buyback in most cases; cites parts shortage as reason for repair delays. Warranty coverage available but rental car reimbursement limited ($44/day). NHTSA has opened recall adequacy investigation RQ26001.
Bearing and crankshaft defects causing knocking, rapping, or metal-on-metal noises
Engine produces abnormal internal metallic sounds—knocking, rapping, or tapping—from the engine block or pistons. Defects in connecting rods, crankshaft, main bearings, or lifters are diagnosed. Owners report these sounds intensify with acceleration or load. In multiple cases, failure occurred within days or miles of first noise; in others, noise persisted or worsened over weeks.
When: Reported from 10,000 to 70,000 miles. Some owners note noises weeks before catastrophic failure; others experience sudden failure shortly after first noise.
Symptoms owners cite: Deep metallic knocking from engine block; Loud rapping or tapping sound that intensifies under acceleration; Engine missing or misfire-like behavior; Loud popping sounds from engine; Squealing belt-like sound followed by knocking; Abnormal ticking or tapping on startup
Codes mentioned: Check engine light (variable—may come on after knocking begins or remain off), No codes found (some cases despite loud noises), Connecting rod bearing failure, Crankshaft damage, Lifter failure (multiple cases)
Repairs/costs cited: Engine replacement required. One case reports lifter replacement ($16,000+) did not resolve the issue; failure reoccurred. Another case shows flywheel-to-camshaft interference after recall oil-change remedy. No recurring-noise warranty coverage in narratives.
Recalls/TSBs owners mention: Recall 25V-274000 remedy (inspection, 0W-40 oil, new cap) may not address or prevent bearing/crankshaft failures. At least one owner had lifters replaced multiple times at different dealerships with no lasting fix. Warranty coverage uncertain; some repairs denied or delayed due to parts shortages.
Oil consumption and low-oil-level issues
Owners report excessive oil consumption between scheduled maintenance intervals—some consuming a quart between services or continuing to lose oil after oil changes. No consistent warning system alerts owners to low oil. A few narratives connect oil consumption to bearing failure and engine seizure. Dealership responses vary from dismissing it as normal to recommending consumption tests.
When: Reported from 10,000 to 70,000+ miles. One case involved oil consumption tests ongoing at time of complaint.
Symptoms owners cite: Excessive oil consumption between oil changes; Oil level low at startup or between services; Blue smoke from exhaust (one case, at 19,000 miles); No warning light for low oil (in most failure cases); Slow engine cranking before failure (one case)
Codes mentioned: Low oil pressure warning (post-failure only), No pre-warning codes in most cases
Repairs/costs cited: Oil consumption tests initiated at dealerships; no parts or remedies cited. One owner notes blue smoke despite regular 3,000-mile oil changes. Dealer attributed blue smoke to normal operation.
Recalls/TSBs owners mention: Dealership recommended oil consumption testing but offered no repair prior to failure. Recall 25V-274000 remedy includes oil-change to 0W-40 and new cap; unclear if this addresses underlying consumption issues. No buyback or supplemental warranty offered for oil-related concerns in narratives.
Recalled engine still failing after 25V-274000 recall inspection and remedy
Owners report bringing vehicles in for the official 6.2L engine recall (25V-274000), passing the dealer inspection (Pico test, listening to motor), receiving the new-oil remedy (0W-40, new cap), and then experiencing catastrophic engine failure within days, weeks, or months. One owner failed inspection and was still refused full engine replacement under recall. The recall remedy appears insufficient to prevent rod/crankshaft bearing failures.
When: Failures post-recall occur within days (1 case at 24 hours, 50 miles), weeks (several cases), or months (most cases). Recall inspections performed in June–November 2025; failures reported through January 2026.
Symptoms owners cite: Engine passes Pico inspection test or listening inspection; Owner receives 0W-40 oil and new cap; Engine subsequently fails with loss of propulsion; Knocking, rapping, or loss of power; Check engine and oil-pressure warnings post-failure; One case: flywheel interference after oil change
Codes mentioned: Check engine light (post-remedy failure), Low oil pressure warning (post-failure), Connecting rod or main bearing failure (post-remedy)
Repairs/costs cited: Full engine replacement required despite passing recall inspection. Parts on backorder for months. One case required reflywheel replacement after recall oil-change caused interference.
Recalls/TSBs owners mention: Recall 25V-274000 remedy (inspection + 0W-40 oil + new cap) does not prevent subsequent engine failure. GM refuses engine replacement under recall in some cases, citing condition as 'top' (camshaft/lifter) rather than 'bottom' (rod/bearing). NHTSA opened recall adequacy investigation RQ26001 due to 36+ complaints of post-recall failure. GM stated recall remedy is final; no extended warranty or buyback offered.
Recall parts unavailable for extended periods (backorder situation)
Although 25V-274000 recall was issued, many dealerships report having no remedy parts (engine blocks or related components) available, with no firm ETA. Owners are notified of the recall but cannot have it completed. Some describe waiting months without service or hearing from dealers. This delays or prevents the recall repair from being performed at all.
When: Recall issued June 2025; parts unavailable through January 2026 (7+ months in some cases reported as of complaint date).
Symptoms owners cite: Recall notice received; Dealership confirms parts not available; Owner left without remedy for months; No communication about ETA; Owners afraid to drive due to unresolved recall
Repairs/costs cited: No repair possible until parts arrive. VIN tool confirms parts not yet available in multiple narratives. Owners continue to drive recalled vehicles or avoid use out of safety fear.
Recalls/TSBs owners mention: GM acknowledged extended delay. Multiple dealers advised parts are on 'Galactic backorder' with no known arrival date. GM referred some owners to NHTSA Hotline. No loaner vehicles or extended rental reimbursement offered for recall delay in narratives.
Transmission or electrical interaction (neutral shift, stuck components)
A few owners report the vehicle shifting into neutral unexpectedly while driving, or the transmission becoming stuck so that neutral cannot be selected when the engine is off. One owner notes the design flaw: the Tahoe cannot be manually shifted to neutral without engine running, trapping the vehicle in the roadway. Check-engine lights and electrical warnings often appear simultaneously with loss of propulsion.
When: Reported at various mileages (17,000–48,000 miles). One case: transmission shifted to neutral at 19,000 miles.
Symptoms owners cite: Vehicle shifts into neutral unexpectedly while driving; Unable to shift to neutral when engine is off; Vehicle stalls with transmission stuck in gear; Check engine and oil-pressure warnings; Loss of power steering or brake assist (possible, one mention); Dashboard messages: 'Press START Button,' transmission shift indicator shows neutral
Codes mentioned: Check engine light, Oil pressure warning, No transmission-specific codes mentioned in narratives
Repairs/costs cited: Repair diagnosis unclear in most cases. One owner references need to replace starter, radiator, fuse block, and engine. No transmission rebuild or replacement explicitly cited, though related electrical/fuse failures noted.
Recalls/TSBs owners mention: No mention of recalls or TSBs for transmission or electrical design issues. GM has not addressed the design flaw of no manual neutral override when engine is off.
Synthesized from 93 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.