On December 1, 2025 at around 5pm CST, my 2021 GMC Yukon XL started making a squeeling noise then stopped while driving down the road. It left me stranded in the middle of the road. A P0016 CODE was produced and the engine light came on. I had the vehicle towed the next day to Stew Hanses GMC in Clive, Iowa. The engine was torn down for inspection and was told the rod bearing went bad and it had…
2021 GMC Yukon XL engine problems
moderate 98 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
98
Recalls
0
Avg fix
$3,100
1injury
When does it fail?
Of the 98 engine complaints filed for the 2021 GMC Yukon XL, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Of the 6 model years of GMC Yukon XL we track for engine problems, this one carries the most owner complaints on file — 98.
Engine accounts for 51% of every owner complaint on file for this vehicle — the dominant problem area across 9 categories tracked.
The failure pattern owners describe
Buyer takeaway: The 2021 GMC Yukon XL has widespread engine failures across the lineup—especially the 6.2L V8 (recall N252494000)—involving connecting rod bearing collapse, lifter fractures, and camshaft damage that can cause sudden loss of power at highway speeds, leaving occupants stranded in traffic. Owners are reporting complete engine seizures, replacement engines failing again, and significant out-of-pocket costs even under warranty due to mileage or build-date exclusions from recall coverage.
Owners of the 2021 GMC Yukon XL describe catastrophic engine failures with alarming consistency: connecting rods or rod bearings fracture internally without warning, metal shavings contaminate the oil, and the engine either locks up solid or shuts off abruptly at highway speeds. Most failures occur between 50,000 and 75,000 miles, though some happen as early as 4,000 miles or as late as 137,000. The symptoms are often minimal—a subtle noise that rapidly escalates into loud clattering or knocking—before the engine seizes or stalls completely.
Owners report being stranded on interstates with families aboard, coasting across multiple lanes of traffic, and waiting hours for tow trucks. One family sat roadside for two hours in 99-degree heat with a one-year-old after complete engine shutdown at 75 mph. Another watched their vehicle towed 45 minutes on a mountain pass after seizure, unable to restart.
The 6.2L V8 engine is covered under Recall N252494000, but only for certain build dates and VINs. GM's remedy—an oil change to 0W-40 synthetic and a new oil cap—has failed to prevent failures in multiple vehicles. Owners also report lifter fractures damaging camshafts, requiring full engine replacement. Replacement engines from GM have themselves failed, including one that seized within 10 minutes of operation. Engine replacement costs run $11,000–$16,000, but warranty limits (5 years/60,000 miles) and build-date cutoffs leave many owners thousands of dollars out of pocket despite identical failure mechanisms across the model year.
Same GMC Yukon XL engine reports on nearby years: 2020 · 2022 · 2023
Failure modes owners describe
Connecting Rod or Internal Rod Bearing Failure
Connecting rods or rod bearings fracture or separate internally, causing severe engine damage, metal shavings in oil, loss of compression, and complete engine seizure. Multiple owners report the rod bearing or connecting rod failing without warning, often resulting in catastrophic engine failure and total replacement.
When: Throughout vehicle operation; failures reported between 18,000 and 137,000 miles, most common 50,000–75,000 miles
Symptoms owners cite: loud knocking or clattering noise from engine; engine seizure; metal shavings in oil; sudden loss of power; check engine light illuminated; rough idle and shaking; engine stalls or shut-off during driving
Codes mentioned: P0300, P0016
Repairs/costs cited: Complete engine replacement typically required; costs reported $11,000–$16,000. Some owners paid partial costs due to warranty limitations; GMC offered 60% coverage in one case, leaving $5,000+ out-of-pocket. Replacement engines sometimes remanufactured with same design flaw.
Recalls/TSBs owners mention: Recall N252494000 (25V274000) issued for 6.2L V8 engines but with build-date limitations; GM offered oil change to higher-viscosity 0W-40 synthetic and oil cap replacement as remedy for affected VINs. Extended recall eligibility disputed by owners built just outside cutoff dates. Some owners report denial of coverage due to mileage or warranty expiration (5-year/60,000-mile powertrain warranty); dealer delays for replacement engines—parts on backorder for weeks to months.
Valve Lifter and Camshaft Failure
Valve lifters fracture or fail, damaging camshafts and rocker arms. Owners report loss of power, rough running, and misfire. Lifters may fail on one side of the engine initially, then progress to catastrophic failure requiring full engine replacement.
When: Early in vehicle operation and after repairs; failures from 4,000 miles to 109,000 miles, often repeating after dealer repair attempts
Symptoms owners cite: engine squeaking or chirping noise; engine shuddering or rough idle; loss of power; check engine light; misfire on specific cylinder; loud knocking sound; traction control light illuminated
Repairs/costs cited: Initial lifter replacement $6,000 reported; later found to require full camshaft and lifter replacement or complete engine replacement. One owner reports lifter repair ($6K) followed by oil consumption issue and subsequent engine replacement ($14K–$16K). Dealer repairs sometimes incomplete—noise reoccurred after service.
Recalls/TSBs owners mention: Manufacturer covered only one side of lifter replacement in one case; coverage inconsistent. No recall remedy confirmed for lifter-only failures. Technical Service Bulletin N212353840 referenced in one complaint. Dealer attempts at repair often unsuccessful; subsequent failures common.
Engine Seizure (Lock-Up)
Engine internally freezes or locks, preventing rotation or restart. Described as complete engine lock or severe friction preventing crankshaft movement. Vehicle loses all power and becomes immobile.
When: Can occur suddenly during normal operation; reported at 57,000–133,000 miles
Symptoms owners cite: engine will not turn over or restart; check engine light; loss of power; engine shut-off while driving; transmission unable to shift to neutral even with force
Repairs/costs cited: Requires engine replacement; tow trucks unable to place vehicle in neutral or move wheels due to internal lock. Engine removal for inspection sometimes not possible. Repair costs not always covered due to warranty limits or mileage over recall threshold.
Recalls/TSBs owners mention: Owners outside powertrain warranty (5 years/60,000 miles) denied coverage. One case: owner 9 days outside warranty, GM refused help; dealership quoted $2,000 additional cost after GM partial assistance denied.
Oil Consumption and Bearing Degradation
Engine consumes oil rapidly between services, indicating bearing or ring wear. Low oil warnings illuminate despite recent service. Leads to rod bearing failure and complete engine seizure.
When: Develops gradually during normal operation; can progress to catastrophic bearing failure within weeks
Symptoms owners cite: low engine oil warning light; oil dipstick showing critically low level; engine running rough after oil top-offs
Repairs/costs cited: Oil consumption test performed at dealer; engine replacement required. One owner reports oil top-off multiple times during short driving period. No repair short of engine replacement documented.
Recalls/TSBs owners mention: No specific warranty coverage noted. One owner reports vehicle serviced one month prior with oil change; failure occurred shortly after.
Engine Stall and Loss of Power (No Restart)
Engine shuts off completely while driving without warning or gradual symptoms. Vehicle loses all electrical power or power steering assist, becoming inert on roadway. Restart attempts fail or require multiple tries.
When: Sudden onset, most commonly reported on highways at 50–75 mph; occurs early in trips
Symptoms owners cite: engine shut-off without warning; complete loss of power; no warning lights prior to failure; 'restart engine' message on display; inability to restart immediately; loss of power steering and brake assist
Repairs/costs cited: Diagnosis often reveals internal engine failure (rod bearing, camshaft, crankshaft damage) or transmission pump failure. Engine replacement or transmission replacement required.
Recalls/TSBs owners mention: No manufacturer response or recall remedy noted in most stall complaints. One case mentions fuse pack replacement performed by dealer before subsequent catastrophic engine failure.
Camshaft and Valve Pushrod Damage
Camshaft fractures or fails, often preceded by lifter damage. Valve pushrods and rocker arms may also break. Results in misfiring, rough running, and loss of power.
When: Reported at 80,000–109,000 miles; sometimes during repairs of related issues
Symptoms owners cite: engine running rough; check engine light; misfire warning; loud knocking sound; loss of power during acceleration
Repairs/costs cited: Camshaft and lifter replacement required; often found during engine inspection for lifter noise. One case: fractured valve pushdown lifter and failed camshaft requiring replacement.
Recalls/TSBs owners mention: No specific recall remedy. Manufacturer provided no assistance in cases examined.
Transmission Failure (Secondary to Engine Issues)
Transmission pump fails or transmission seizes, reported in conjunction with or following engine problems. Whining noise from transmission, then pump failure causing severe internal damage.
When: Reported at 66,000 and 73,000 miles; sometimes after engine issues or limp-mode operation
Symptoms owners cite: whining sound from transmission; failure to shift gears; high RPM without acceleration; check engine light; transmission unable to shift after engine replacement
Repairs/costs cited: Transmission replacement required; one case reports transmission pump failure causing severe internal damage. Cost not specified, but vehicle required transmission replacement, then subsequent engine failure.
Recalls/TSBs owners mention: No transmission warranty assistance documented in narratives. Transmission replaced, but vehicle experienced subsequent engine failure.
Engine Bearing and Crankshaft Issues (5.3L L84 Engine)
One owner of a 2021 Yukon XL with 5.3L engine (rather than 6.2L) reports complete engine failure and crankshaft issue identical to recalled 6.2L defect, but 5.3L engines not included in recall.
When: At 70 mph during normal highway operation
Symptoms owners cite: complete engine failure; crankshaft issue diagnosed; engine lock-up
Repairs/costs cited: Complete engine replacement required; owner responsible for all costs as 5.3L not in recall
Recalls/TSBs owners mention: Recall N252494000 applies only to 6.2L V8; 5.3L crankshaft failures not covered. Owner reports identical failure mechanism as recalled 6.2L engines.
Engine Failure (Unspecified / No Restart After Recall Repair)
Engine fails again or remains inoperable after recall repair or engine replacement. One owner reports replacement engine seized within 10 minutes of operation; another reports second engine failure after first replacement and recall remedy.
When: Immediately after replacement (one case: 10 minutes) or months later (second failure after first replacement)
Symptoms owners cite: replacement engine seizure; engine failure recurrence; engine internally failed—likely rod bearing
Repairs/costs cited: Second engine replacement required; owner frustrated by repeated failures and distrust of remanufactured engines provided by GM.
Recalls/TSBs owners mention: Second engine replacement provided in one case after first replacement engine seized. Owner reports concern that replacement engines are remanufactured versions of L87 6.2L with unresolved design flaws.
Synthesized from 98 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 8 most recent
Engine failure of lifters and piston rings at 58000 miles. Engine failure at highway speeds causing complete loss of power on highway. It is completely unacceptable to have such catastrophic engine failure on such a new vehicle.
The contact owns a 2021 GMC Yukon XL. The contact stated that while driving at 30 MPH, the gear shifter independently shifted to neutral(N), and the vehicle speed decreased. The contact stated that upon depressing the brake pedal, the vehicle lost drive power. The vehicle was towed to the dealer, where it was diagnosed, and the dealer determined that the engine needed to be replaced. The vehicle…
Low engine oil message keeps flashing after less than 2,000 miles of driver. Excessive oil consumption. Took vehicle to GMC dealership and it was confirmed that an engine replacement or replacement of the pistons and rings is necessary. Only 77,000 miles on the vehicle. My car is currently not a part of the massive recall.
Vehicle indicated that the suspension system was disabled. Vehicle then lost power and disabled itself driving through the Eisenhower Tunnel I-70 Colorado. This tunnel is over a mile and a half long. We called 911 as we were very worried we were going to have another vehicle crash into us as there are no breakdown lanes. The tunnel had to close to West Bound Interstate traffic and the vehicle…
Auto stalled in the middle of the road without any warning light causing life threatening incident auto only has 8000 miles
The contact owns a 2021 GMC Yukon XL. The contact stated while driving at an undisclosed speed, the low engine oil warning light illuminated. The contact checked the oil dipstick and noticed that the oil level was extremely low. The contact stated that the vehicle was serviced by the dealer a month prior, and the oil change was performed. The contact stated that the oil level required to be…
With only 52 miles (2-days old), I was driving home when I heard a knock. Then the engine light came on and the vehicle stability control lowered the vehicle and the vehicle shut off. I was left in the middle of traffic unable to move the vehicle to a safe location. Neutral would not work either. When the vehicle was towed to the GMC dealership, they knew exactly what was wrong with the car,…
Had engine trouble with your 2021 GMC Yukon XL?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2021 GMC Yukon XL?
It's a documented issue but not catastrophic. 98 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 23 complaints that reported odometer mileage, most engine failures cluster between 58,000 and 100,371 miles, with the median around 73,000. A quarter of owners report trouble before 58,000; a quarter make it past 100,371. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2021/GMC/Yukon XL.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.