Lifter failure with cylinder #6. Car violently shook prior to this failure. No engine lights or messages until the next day when tried to drive. Ended up towing car to dealer. Car had 76k miles on it. Recall on 6.2L, but not on the 5.3L which is not immune to this same issue as the 6.2L engine.
2021 GMC Yukon XL powertrain problems
moderate 38 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
38
Recalls
0
Avg fix
$2,500
What stands out
Of the 5 model years of GMC Yukon XL we track for powertrain problems, this one carries the most owner complaints on file — 38.
Owners have filed 38 powertrain complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
The failure pattern owners describe
Buyer takeaway: A substantial cluster of 36 complaints documents severe powertrain failures in 2021 GMC Yukon XL models, including engine bearing collapse, transmission valve body failure, lifter damage, and sudden loss of power—often at highway speeds with children aboard. Many owners report VINs excluded from related recalls despite identical symptoms, combined with months-long parts backlogs and out-of-pocket repair bills exceeding $10,000.
Owners describe sudden, catastrophic powertrain failures across multiple systems. The most common pattern: engine bearing damage (spun connecting rod and main bearings) causing seizure without warning at highway speeds, sometimes with families inside the vehicle. Owners reported it happened at 17,000 to 82,000 miles, often with no prior warning signs or check-engine lights. One owner's engine failed at 81,000 miles just months after the dealership performed an engine replacement.
Transmission valve body failures are equally widespread, causing loss of acceleration, inability to shift into reverse, stuck gears, and hard shifting—often triggering "Reduced Performance" or "Service Transmission Now" messages. Some owners experienced a second transmission failure within two months of the first repair. Multiple owners report the parts remain on national backorder for months; one owner's part was ordered in March 2025 with no ETA by June.
Lifter and camshaft damage appears without warning, accompanied by severe engine knocking that dealers initially dismissed as normal. Excessive oil consumption—3 quarts per 1,000 miles—was flagged in multiple reports even while GM's own testing deemed it acceptable. The critical frustration: owners' VINs are repeatedly excluded from related recalls despite having identical symptoms and the same model year as covered vehicles. Dealers and GM have acknowledged these are widespread defects but refused coverage based on engine displacement (5.3L versus 6.2L) or VIN exclusions.
Same GMC Yukon XL powertrain reports on nearby years: 2022 · 2023
Failure modes owners describe
Engine internal bearing failure (connecting rod and main bearing damage)
Catastrophic internal mechanical failure involving bearing material in oil, spun bearings on connecting rods #1 and #2, and discolored main bearing cap #3 from extreme heat. Results in complete engine seizure and loss of power while driving.
When: 17,067 miles; 35,204 miles; 62,365-81,000 miles range across multiple reports
Symptoms owners cite: Sudden loss of power at highway speeds; Engine seizure or stalling without warning; Clanking or clunking noise from engine; Multiple warning lights and maintenance messages illuminating; Vehicle unable to restart after stalling; Check engine light illuminated
Codes mentioned: P0016 - Crankshaft Position Sensor and Intake/Single Camshaft Position Sensor Correlation
Repairs/costs cited: Engine replacement required; costs cited from $10,000-$14,896 out of pocket after dealer negotiations. One owner awaited replacement engine for 4+ months with no ETA. Parts reported on national backorder.
Recalls/TSBs owners mention: GMC acknowledged defect in some cases via Case Numbers; offered partial coverage (30-50% of repair costs in goodwill claims). Some owners' VINs excluded from related recalls (campaigns 24V797000, 24V839000) despite same model year and engine type. April 2025 recall for 6.2L V8 engine defect (narrative #9).
Transmission valve body failure and control issues
Transmission valve body fails, causing loss of propulsion, inability to shift properly, stuck gears, hard shifting, and limp mode. Multiple owners report second transmission failure within months of first repair. Affects 10-speed transmission in particular.
When: 62,365-82,000 miles; some failures within 2 months of prior repair
Symptoms owners cite: Sudden loss of acceleration or deceleration; Vehicle enters limp mode with reduced power (35 MPH max); Unable to shift into reverse; vehicle refuses to move backward; Hard or delayed shifting; transmission slips; Vehicle stuck in one gear; will not shift properly; Engine revs abnormally but vehicle does not respond to accelerator; Grinding or shuddering sensation while driving; Check engine light and 'Reduce Acceleration - Drive with Care' or 'Service Transmission Now' messages displayed
Codes mentioned: P0700 - Transmission Control System Malfunction, P0776 - Pressure Control Solenoid B Malfunction, P1881 - Transmission Fluid Temperature Sensor Circuit Malfunction
Repairs/costs cited: Valve body replacement; parts reported on national backorder for months (some ordered in March 2025 with no arrival by June 2025). Repair costs not specified. One owner reported second transmission replacement needed after first valve body replacement.
Recalls/TSBs owners mention: NHTSA Campaign 24V797000 (PowerTrain) and 24V839000 issued; however, multiple owners' VINs excluded despite identical symptoms and same model year. GM issued Technical Service Bulletin N242454441-02 for similar issues but some VINs not covered under special coverage. One owner noted GM referred them to NHTSA Hotline to report failures outside recall parameters.
Lifter and camshaft damage with excessive oil consumption
Engine lifters collapse and camshaft sustains damage, often accompanied by severe engine knocking. Oil consumption reaches excessive levels (3 quarts per 1,000 miles reported). Typically occurs without warning.
When: 22,000 miles (knocking noticed); 34,000 miles (oil consumption began); failures at 76,000+ miles
Symptoms owners cite: Engine lifter collapse; Camshaft damage or wear; Severe engine knocking or ticking noises; Excessive oil consumption (3 quarts per 1,000 miles); Violent engine shaking prior to failure; No warning lights initially; check engine light appears after shutdown and restart attempt
Repairs/costs cited: Engine replacement or rebuild required; one owner cited over $10,000 in repairs for lifters, camshaft, and cylinder damage. Another faced engine rebuild need. Oil consumption testing ordered by GM but deemed normal despite excessive levels.
Recalls/TSBs owners mention: 6.2L engine failures covered under April 2025 recall; however, 5.3L engine lifter failures excluded from recall despite owners reporting identical mechanical failures. Dealers acknowledged issue as widespread but refused coverage based on engine size discrepancy. One owner denied assistance, case classified as normal wear and tear.
Engine oil pump failure and inadequate lubrication
Oil pump failure or malfunction results in inadequate engine oil circulation, leading to bearing wear and potential internal mechanical damage.
When: Not specified; discovered during dealer inspection after check engine light activation
Symptoms owners cite: Check engine light illuminated; Engine stopped while driving; Oil pressure issues detected by dealer
Repairs/costs cited: Oil pump replacement and engine bearing assessment required; additional engine wear detected.
Engine wire chaffing and fuel pressure sensor issues
Engine wiring harnesses experience chaffing or damage related to fuel pressure sensor routing, causing electrical circuit faults.
When: 29,470 miles
Symptoms owners cite: Engine starting issues; Electrical faults related to fuel system
Repairs/costs cited: Wire repair required; exact costs not specified.
Transmission torque converter failure and metal contamination
Torque converter disintegrates internally, distributing metal particles throughout transmission fluid and damaging internal transmission components.
When: Highway speeds; mileage not specified in narrative
Symptoms owners cite: Loss of propulsion while driving at highway speeds in traffic; Metal debris visible in transmission fluid
Repairs/costs cited: Transmission replacement required; cost not specified.
Body Control Module (BCM) malfunction causing neutral shift and stall
BCM programming error or fault causes unintended neutral engagement while driving, resulting in engine shutdown and vehicle becoming stuck in park. Difficult to restart or shift out of park.
When: Mileage not specified
Symptoms owners cite: Vehicle unexpectedly shifts into neutral while driving at low speed (30 MPH); Engine shuts off immediately; Vehicle stuck in park; will not shift out of park; Will not restart
Repairs/costs cited: BCM reprogramming performed per GM technical bulletin. Parts cost not specified.
Recalls/TSBs owners mention: GM issued technical bulletin for BCM reprogramming; owner concerned about severity if failure had occurred at highway speeds.
Rear differential failure requiring replacement
Rear differential sustains mechanical damage requiring full replacement.
When: Mileage not specified
Symptoms owners cite: Vehicle shaking in drive; Shaking when accelerating; Related transmission issues concurrent
Repairs/costs cited: Rear differential replacement required; cost not specified.
Synthesized from 38 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 6 most recent
While driving my 2021 GMC Yukon XL, the vehicle unexpectedly lost acceleration. After lifting off the gas pedal, it jolted forward, triggered a “Reduced Performance” dashboard warning, and remained in what felt like second gear, refusing to shift. I immediately pulled into a parking spot; when I attempted to reverse, the vehicle would not move backward. As you may imagine, this was a major safety…
I was driving 30 mph when the car went into neutral and rolled to a stop. When I put on the brakes the engine shut off and it went into park. It would not restart or shift out of park . I was stuck in an active busy road. The car was towed to the dealer. They said it was a problem with the BCM. GMC had put out a bullletin which was to reprogram the BCM. My concern is that if this had happened on…
I'm vehicle has experience both active recalls for similar model year but my VIN isn't listed as been one that is covered by the call. 25V274000 and 21V739000.
Routine oil change by professional local mechanic. Upon completion we were told that the vehicle would not turnover. The mechanic diagnosed and found that were 2 recalls for our vehicle - one for the fuel pump module and one for the engine. We had our vehicle towed to the local GM dealership. They then replaced the fuel control module. GM tried to manually crank over but engine seized once…
GM has consistently failed to deliver safe and reliable vehicles to the american public. I purchased a 2021 GMC Yukon Denali XL and the transmission needs to be replaced completely after the valve body was already replaced once. This issue proves to me that GM is not a reliable and trustworthy brand, with poor business ethics and a track record of having to be bailed out by our very own…
Had powertrain 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 powertrain problem on the 2021 GMC Yukon XL?
It's a documented issue but not catastrophic. 38 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 8 complaints that reported odometer mileage, most powertrain failures cluster between 64,000 and 82,000 miles, with the median around 70,000. A quarter of owners report trouble before 64,000; a quarter make it past 82,000. 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 $2,500 for powertrain 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 powertrain?
No active recalls currently cover powertrain 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.