DFM (Dynamic Fuel Management) system failure causing collapsed lifters, oil consumption, and complete engine failure. To repair our vehicle it will require a complete engine replacement. This has been a known issue with GM and yet there has been no recall to fix the issue. Now our engine must be replaced.
2021 Chevrolet Tahoe: excessive oil consumption
6 of the 467 complaints about the 2021 Chevrolet Tahoe describe excessive oil consumption.
- owner complaints
- 6
- of this car's complaints
- 1%
- recalls
- 1
Is there a fix? There is 1 recall and 277 service bulletins for this area of the car. See below
Excessive oil consumption by model year
What owners say
2021 Chevy Tahoe with 6.2 engine (VIN: [XXX]) has been experiencing severe oil consumption, and making odd noises during operation. All while NOTshowing ANY recalls for the issue. Although there's an active recall/investigation into the 6.2 L87 engine, which my vehicle has. I've been having Valvoline document the severe oil consumption during oil changes per manufacturer specs. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving 65 MPH, there was an abnormal vibration coming from the engine compartment and felt in the steering wheel. The check oil warning light illuminated. The vehicle was taken to the residence and then to the dealer, where it was determined that the vehicle was functioning properly, and there was no oil leak; however, the oil level was low even though an oil change was not yet due. The dealer added oil to the vehicle, and an oil consumption test was ordered. The manufacturer was notified of the failure and a complaint was filed. The vehicle was not repaired. The failure mileage was approximately 48,000.
Urgent: Engine Failure Following Recent Service – 2021 Chevrolet Tahoe To Whom It May Concern, I am writing to formally request assistance and an investigation regarding a serious engine failure involving my 2021 Chevrolet Tahoe. In July 2025, I paid out of pocket to have the lifters and camshaft replaced on this vehicle. More recently, while traveling, the vehicle broke down and was taken to Uebelhor Chevrolet, where the valve body in the transmission was replaced. After picking the vehicle up from Uebelhor Chevrolet, the vehicle broke down again approximately one hour later while in Henderson, Kentucky. At that time, the engine began smoking, running rough, and misfiring. I checked the oil level during the incident and found it to be extremely low on the dipstick (I have photographic evidence of this condition). The vehicle had to be towed to Kate Faupel Chevrolet for further inspection. I was then informed that the engine has a dropped lifter on cylinder #8 and possible camshaft damage. Given the following factors: Recent out-of-pocket lifter and camshaft replacement (July 2025) Immediate failure shortly after leaving a Chevrolet dealership Extremely low oil level observed at the time of breakdown (with photo documentation) Diagnosis consistent with potential oil starvation and internal engine damage I am requesting that General Motors conduct a full review of this situation to determine responsibility. This raises serious concerns about a potential defect, improper prior repair, or a service-related issue that resulted in catastrophic engine damage. At this time, I am not authorizing repairs until liability is determined. I am requesting: A formal case review and investigation Assistance with repair or full engine replacement Guidance on how this situation will be resolved This incident created a significant safety concern, as the vehicle became disabled shortly after leaving a dealership during travel. Please contact me as soon as possible to discuss next steps
The vehicle stalled while driving down the road and started making a loud ticking noise, the engine light went on. It was brough to the dealership where they did an engine rebuild. They replaced 16 lifters and camshaft, a pulley belt and gaskets. The vehicle was picked up, however, a month later the oil low add oil light came on and the oil tank was more than 2.5 quarts low indicating extreme burning of oil. The vehicle is shuttering on acceleration of low RPMs. Brought it back to the dealership and awaiting further instruction. It caused a major safety concern because it has the potential to stall due to a motor defect on a major highway, putting my family and possibly others at risk of harm or death.
I am getting heavy oil consumption and the dealer just keeps on wanting to run tests and not fix the actual issue
Service bulletins that may apply
- Condition that could
- Condition where the connecting rod and/or crankshaft engine components in these vehicles may have...
- Under Field Actions N252494000, N252494001, the service procedure includes performing a PICO test on...
- Condition that could
- This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer...
- This service bulletin provides information on replacing the intake manifold when the engine is replaced...
- This bulletin advises the tech to inspect deeper into what may be to main
- The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle...
Related recalls
Engine and engine cooling: engine: hard parts internal/mechanical
- What is wrong
- General Motors LLC (GM) is recalling certain 2021-2024 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, and Tahoe, GMC Sierra 1500, Yukon, and Yukon XL vehicles equipped with a 6.2L V8 gas engine. The connecting rod and/or crankshaft engine components may have manufacturing defects that can lead to engine damage and engine failure.
- Risk
- Engine failure increases the risk of a crash.
- Remedy
- Dealers will inspect the engine, and as necessary, repair or replace the engine. For vehicles that pass inspection, dealers will add higher viscosity oil, install 6 oil fill cap, replace the oil filter, and update the owner's manual. Repairs will be performed free of charge. Owner notification letters were mailed June 18, 2025. Owners may contact Cadillac customer service at 1‑800‑333‑4223, Chevrolet customer service at 1‑800‑222‑1020, or GMC customer service at 1‑800‑462‑8782. GM's number for this recall is N252494000.
Recall number 25V274000 · Recall details
Questions about the 2021 Chevrolet Tahoe oil consumption
Is excessive oil consumption a common problem on the 2021 Chevrolet Tahoe?
6 of 467 owner complaints about the 2021 Chevrolet Tahoe (1%) mention excessive oil consumption. The model year with the most reports is 2007.
Is there a recall or service bulletin for this on the 2021 Chevrolet Tahoe?
There is 1 recall and 277 service bulletins for the same area of the car. Check them below with your VIN.
Other symptoms on the 2021 Chevrolet Tahoe
Check engine light 88Fuel pump 79Engine failure 56Stalling 56Loss of power 49Knocking 39Won't start 26Misfire 24Won't shift 18Headlights 16Harsh shifting 14Transmission failure 14Airbag light 11Grinding brakes 9Hesitation 9Collision warning 8Fire or smoke 8Adaptive cruise 7Jerking 7Power steering loss 7Sunroof shattered 7Warning lights 7Brake failure 6Battery drain 5Slipping 5
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