Certain vehicles may have a condition that could cause the cylinder 2 glow plug to fail. If this failure occurs, the Malfunction Indicator Light (Check Engine Light) will illuminate and a diagnostic trouble code will set. This special coverage covers the condition described above for a period of 15 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after May 11, 2026, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair
full bulletin at NHTSA ↗2021 Chevrolet Tahoe engine problems
moderate Owners of the 2021 Chevrolet Tahoe have filed 112 NHTSA complaints about the engine, typically surfacing around 61,000 miles at roughly $3,100 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See engine across all vehicles →
Failure mileage
Complaints
112
Recalls
0
Avg fix
$3,100
| Model year | engine complaints |
|---|---|
| 2017 Tahoe | 10 |
| 2018 Tahoe | 14 |
| 2019 Tahoe | 15 |
| 2020 Tahoe | 8 |
| 2021 Tahoe (this page) | 112 |
| 2022 Tahoe | 56 |
| 2023 Tahoe | 92 |
| 2024 Tahoe | 24 |
| 2025 Tahoe | 12 |
1fire
When does it fail?
Of the 112 engine complaints filed for the 2021 Chevrolet Tahoe, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 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 20 model years of Chevrolet Tahoe we track for engine problems, this one carries the most owner complaints on file — 112.
Owners have filed 112 engine 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.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Certain vehicles listed above, may have a condition where the connecting rod and/or crankshaft engine components in these vehicles may have manufacturing defects that can lead to engine damage and engine failure. This special coverage covers if an engine failure occurs in the vehicle as a result of the condition described above for a period of 10 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after May 23, 2025, are covered by this special coverage and must be submitted using the labor operation code
full bulletin at NHTSA ↗Under Field Actions N252494000, N252494001, the service procedure includes performing a PICO test on vehicle engines within the identified suspect VIN population. If the engine passes the PICO test, the engine oil will be changed from 0W20 to Mobil 1 Supercar 0W40 dexosR. From that point forward, the engine must use 0W40 dexosR oil products for all future oil change services.
full bulletin at NHTSA ↗Certain vehicles listed above, may have a condition that could cause the engine coolant control valve to fail an onboard vehicle diagnostic test. If this condition were to occur, the Malfunction Indicator Lamp (Check Engine Light) will illuminate, and a diagnostic trouble code will set. Additionally in some cases, the engine cooling fans may run after the engine is switched off. Dealers are to replace the engine coolant control valve as necessary. The repairs will be made at no charge to the customer.
full bulletin at NHTSA ↗This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of 2021 Chevrolet Tahoes describe sudden engine failures with little to no warning. The most common issue involves lifter collapse, which creates a ticking or knocking sound and triggers a check engine light. Engines misfire, lose power, and shake violently. Some owners have experienced these failures as early as 5,000 miles; others at 100,000 miles or beyond. Metal shavings appear in the oil, indicating secondary damage to crankshafts, bearings, and camshafts. In the worst cases, connecting rods bend or seize, forcing total engine replacement at costs exceeding $14,000.
Transmission problems appear frequently: check engine lights combined with hard shifts, reduced acceleration messages, and the vehicle limited to 45 mph. Dealerships have replaced valve bodies and wiring, yet failures recur in the same vehicles.
Owners report that fuel pump control modules fail without warning, shutting down the engine mid-drive. Several mention their VINs fall outside existing recalls (Campaign 25V274000, N252494001) despite owning the exact model year and engine size as recalled vehicles. One owner documented an extremely low oil level shortly after dealership service, raising questions about improper repair or design defects. Dealers have admitted these are "known issues" while refusing to cover repairs post-warranty. One vehicle caught fire while parked. Throughout these narratives, owners emphasize the safety hazard: loss of power at highway speeds, especially with children aboard, has forced shoulder pulls and exposed them to rear-end collision risk.
Same Chevrolet Tahoe engine reports on nearby years: 2018 · 2019 · 2022 · 2023 · 2024
Failure modes owners describe
Valve Lifter Failure
Lifters collapse, detach, or fail, resulting in misfires, rough running, loss of power, and knocking sounds. Failures often lead to secondary damage to pushrods, camshafts, and cylinder heads. Metal debris from failed lifters contaminates the oil system.
When: 5,000 to 187,000 miles; earliest reported at ~5,300 miles
Symptoms owners cite: Ticking or knocking sound from engine; Check engine light, often flashing; Rough idling and misfiring; Loss of power or reduced acceleration; Engine shaking and vibration; Vehicle bucking and hesitation
Codes mentioned: P0300, P0305, P129F, U18A2
Repairs/costs cited: Replacement of lifters, pushrods, camshaft, and gaskets; costs reported from $3,500 to $13,549.79. Metal shavings found in oil pump and other engine components.
Recalls/TSBs owners mention: Some owners report GM paid half of repair costs post-warranty, indicating admission of fault. No blanket recall for all affected vehicles; many VINs excluded despite matching symptoms and model year.
Connecting Rod and Crankshaft Failure
Internal engine failure involving bent, damaged, or seized connecting rods and crankshaft. Occurs without warning; causes catastrophic engine damage requiring full engine replacement. Associated with NHTSA Campaign 25V274000 for some 6.2L models, but many affected 5.3L and 6.2L VINs remain outside recall.
When: 10,000 to 100,000 miles; some failures occur within first year of ownership
Symptoms owners cite: Sudden loss of power at highway speeds; Loud clunk or banging noise from engine; Check engine light, often flashing; Vehicle stalls and will not restart; Black smoke from exhaust; Violent shaking before failure; No advance warning in most cases
Repairs/costs cited: Full engine replacement required; costs $14,500 to $15,027. Metal shavings in oil system indicate bearing damage. Bent rods confirmed by mechanics.
Recalls/TSBs owners mention: GM Recall N252494001 covers certain 2021–2024 6.2L V8 engines; 25V274000 covers additional models. However, many owners report their VINs excluded despite identical failure modes. No recall issued for 5.3L engines, though owners report the same failure pattern.
Fuel Pump Control Module Failure
Fuel pump control module fails, causing sudden loss of fuel delivery and engine shutdown while driving. No advance warning; can occur at highway speeds. One owner reported installing replacement himself before discovering it was under recall.
When: ~42,000 to 43,000 miles in reported cases
Symptoms owners cite: Vehicle stalls while driving with no warning; Engine will not start or cranks but does not start; Multiple failures within 1,000 miles in one case
Repairs/costs cited: Replacement of fuel pump control module required. One owner performed repair out of pocket before learning it was a recall item and filed for reimbursement.
Recalls/TSBs owners mention: Recall in place but not all VINs covered. Tow-truck operator and dealership service writer confirmed this is a frequent failure causing vehicles to stop mid-commute.
Transmission Valve Body and Related Transmission Failures
Valve body malfunction causes reduced acceleration, hard shifts, transmission shudder at low and highway speeds, and inability to shift. Some occurrences follow dealer service visits. Repeat failures even after replacement in the same vehicle.
When: Various mileages; one case shows recurring issues at 24,971 miles, 42,000 miles, and continuing
Symptoms owners cite: Check engine light with 'Reduced Acceleration – Drive Safely' message; Hard or abnormal shifting; Transmission shudder at all speeds; Vehicle limited to 45 mph or less; Inability to shift into reverse or other gears; Elevated RPMs with low speed; Hesitation and loss of acceleration response
Repairs/costs cited: Valve body replacement; one owner had two valve body replacements, plus a wire replacement, yet issues recurred. Dealer unable to replicate problem on inspection.
Recalls/TSBs owners mention: No recall or special coverage program mentioned; owners report ongoing problems and dealership inability to diagnose root cause.
Camshaft Failure and Wear
Camshaft becomes severely worn, damaged, or fails prematurely. Often occurs in conjunction with lifter failures and results in significant internal engine damage. One owner reported documented premature wear at 85,000 miles despite regular maintenance.
When: 85,000 miles (one detailed case); secondary failures at various mileages when paired with lifter damage
Symptoms owners cite: Engine knocking and misfiring; Loss of power; Check engine light; Rough running
Repairs/costs cited: Replacement of camshaft required, often along with lifters and other engine components. Costs in $5,000–$13,500+ range when combined with lifter repairs. Retained failed camshaft available as evidence.
Recalls/TSBs owners mention: No specific camshaft recall; treated as secondary damage from lifter failure. No manufacturer assistance reported.
Low Oil Level and Oil Starvation
Vehicles develop abnormally low oil levels despite recent service or proper maintenance. One owner documented extremely low oil on dipstick shortly after transmission repair at dealership. Excessive oil consumption reported in another case after lifter and camshaft work.
When: Shortly after service in one case; ongoing with 2.5+ quarts low in another
Symptoms owners cite: Low oil warning light; Oil level critically low on dipstick; Excessive oil burning after repair; Engine smoking
Repairs/costs cited: One owner obtained photographic evidence of extremely low oil. Another case shows 2.5+ quarts consumed between oil changes post-repair.
Recalls/TSBs owners mention: No response noted; suspected oil starvation may indicate improper service or defective seals.
Engine Fire
Vehicle caught fire while parked and unoccupied, burned to the ground. No diagnosis or investigation by manufacturer.
When: ~10,000 miles
Symptoms owners cite: Smoke and flames emerging from parked vehicle
Repairs/costs cited: Vehicle towed to salvage investigation lot; no manufacturer diagnosis performed.
Recalls/TSBs owners mention: Contacted but no further assistance provided.
Coolant Surge Tank Cracking and Leaks
Coolant surge tank develops cracks and begins leaking coolant, causing overheating and loss of cabin heat. Owners report this is a widespread, known issue in Tahoe/Suburban and GMC Yukon community; some dealerships mark up replacement costs due to scarcity.
When: Unknown specific mileage in complaints; noted as widespread issue
Symptoms owners cite: Engine overheating; Inoperable cabin heating system; No warning lights or messages
Repairs/costs cited: Replacement of coolant surge tank required. Dealerships reportedly marking up costs due to parts scarcity.
Recalls/TSBs owners mention: No recall or special coverage program mentioned; community reports suggest GM is aware of production issue.
Engine Failure Post-Service
Catastrophic engine failure occurring shortly after dealership service (lifter/camshaft replacement, transmission work). One case reports dropped lifter on cylinder #8 and possible camshaft damage within one hour of leaving dealership, with extremely low oil level observed.
When: Within hours to days after service visit
Symptoms owners cite: Engine smoking; Running rough and misfiring; Dropped lifter diagnosis; Extremely low oil level; Loss of power
Repairs/costs cited: Suspected improper repair or improper oil fill during recent service; owner has photographic evidence of low oil condition.
Recalls/TSBs owners mention: Owner requesting GM investigation into defect, improper repair, or service-related damage; awaiting response.
Synthesized from 112 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 5 most recent
2021 Tahoe with l87 engine lifters failed at 2000 miles ,was fixed by dealer then at 82,000 miles same failure only now engine failed, I was driving home when it failed almost got in an accident lost power engine codes were blinking , took to dealer been there since October 20th still at dealership
On [XXX] I was driving in the [XXX] in El Paso Texas at about [XXX] I was about to enter [XXX} and the vehicle suddenly stopped with no warning! I was able to pull to the side and put the blinkers because the traffic was heavy and could of had a vehicle crash into me if I had not maneuver the vehicle quickly(My two daughters where with me in the vehicle). The vehicle prompted to start the…
Tl* the contact owns a 2021 Chevrolet tahoe. The contact stated while driving at low speeds, the vehicle stalled without warning. The contact received a notification from onstar that the engine and transmission had failed. The vehicle was towed to beaver Chevrolet (3494 philips hwy, jacksonville, fl 32207, (904) 398-3036) to be diagnosed. The contact was informed that the engine had collapsed.…
I was driving on the highway at approximately 35mph when I noticed there was no response from the accelerator. I shifted the vehicle into neutral and coasted onto a side road and call OnStar for assistance. The dashboard indicator said to restart engine. I attempted to restart, but the engine would crank but not turn over (start). The vehicle was towed to the dealership where the fuel pump…
Having to replace the radiator due to it leaking around a plastic connection to metal. Was told by the dealership this has an updated part from GM due to it being a known issue.
Had engine trouble with your 2021 Chevrolet Tahoe?
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 Chevrolet Tahoe?
It's a documented issue but not catastrophic. 112 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 32 complaints that reported odometer mileage, most engine failures cluster between 16,786 and 85,000 miles, with the median around 61,000. A quarter of owners report trouble before 16,786; a quarter make it past 85,000. 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 $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/Chevrolet/Tahoe.
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.