2021 Chevrolet Suburban

On January 16, 2026, the Office of Defects Investigation (ODI) opened Recall Query RQ26001.  This investigation was opened to assess the remedy effectiveness of Recall 25V-274. ODI has received complaints alleging engine failure in vehicles after the recall remedy had been completed, whether that remedy involved an oil viscosity change or a complete engine replacement. General Motors (GM) issued Recall 25V-274 to address concerns of engine failure in the L87 engines produced between March 1, 2021 and May 31, 2024. GM cited the root cause as a supplier manufacturing and quality issue. GM’s recall remedy for Recall 25V-274 consisted of two different repairs, either an oil viscosity change or an engine replacement, based on the results of the remedy inspection procedure. ODI continues to receive reports of engine failures after the completion of the recall remedy. To date, ODI has received 499 complaints alleging post-remedy engine failure in vehicles subject to Recall 25V-274, 473 of which involved an oil viscosity change and 26 a complete engine replacement. Additionally, ODI has received 191 reports of L87 engine failures in engines produced after the production period cited in Recall 25V-274. GM reported receiving 6,953 complaints of post-remedy engine failure. ODI is opening this Engineering Analysisto continue investigating complaints of post-remedy engine failure. ODI is expanding the scope of this Investigation to include engines produced after the production period cited in the recall. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.

The Office of Defects Investigation (ODI) has received 1,157 reports of engine bearing failure failures in the L87 6.2L engine produced by General Motors (GM). Of the 1,157 reports received, 173 are outside of the scope of recall 25V-274. These engines are installed in Model Years (MY) 2019–2024 Chevrolet Silverado 1500 and GMC Sierra 1500, and 2021-2024MY Chevrolet Suburban and Tahoe, GMC Yukon/Yukon XL, and Cadillac Escalade/Escalade ESV vehicles. The subject engine failures were investigated as part of a Preliminary Evaluation (PE25001).  GM determined that these engine failures were due to multiple supplier manufacturing and quality issues. GM issued recall 25V-274 to address the supplier manufacturing and quality issues produced between March 1, 2021, and May 31, 2024. Based on the issuance of recall 25V-274, NHTSA has closed PE25001. ODI continues to receive a significant number of reports of engine failure in vehicles outside the scope of 25V-274.  This presents a potential safety risk that warrants further investigation.  ODI is opening this Engineering Analysis (EA) to further evaluate the scope and severity of the potential problem and to fully assess the potential safety-related issues of vehicles built outside the recall scope. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.

On January 16, 2026, the Office of Defects Investigation (ODI) opened Recall Query RQ26001.  This investigation was opened to assess the remedy effectiveness of Recall 25V-274. ODI has received complaints alleging engine failure in vehicles after the recall remedy had been completed, whether that remedy involved an oil viscosity change or a complete engine replacement. General Motors (GM) issued Recall 25V-274 to address concerns of engine failure in the L87 engines produced between March 1, 2021 and May 31, 2024. GM cited the root cause as a supplier manufacturing and quality issue. GM’s recall remedy for Recall 25V-274 consisted of two different repairs, either an oil viscosity change or an engine replacement, based on the results of the remedy inspection procedure. ODI continues to receive reports of engine failures after the completion of the recall remedy. To date, ODI has received 499 complaints alleging post-remedy engine failure in vehicles subject to Recall 25V-274, 473 of which involved an oil viscosity change and 26 a complete engine replacement. GM reported receiving 6,953 complaints of post-remedy engine failure. ODI will close this RQ and continue to investigate complaints of post-remedy engine failure for Recall 25V-274 as part of an Engineering Analysis (EA26005). To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.

On January 16, 2025, the Office of Defects Investigation (ODI) opened Preliminary Evaluation PE25001 after receiving complaints and field reports concerning engine failures in MY2019-2024 GM’s full-size truck and SUV T1XX platform equipped with the L87 6.2L V8 engine. These complainants alleged engine bearing failures resulting in knocking and growling noises from the engine’s bottom end and in some cases more severe consequences such as broken connecting rods leading to engine damage, or engine failure. If the engine fails during vehicle operation, the vehicle will lose propulsion, increasing the risk of a crash. On April 24, 2025, GM issued recall 25V-274 to address the concern with L87 engines produced between March 1, 2021, and May 31, 2024.  GM cited the root cause as a supplier manufacturing and quality issues. GM’s  recall remedy will be either an oil change to an oil with a different viscosity or engine replacement depending on the results of the remedy inspection procedure. To date, ODI has received 1,157 allegations of engine bearing failure. GM submitted 55,464 reports in total, with 29,752 unique VINs. ODI continues to receive allegations of L87 engine failures which fall outside of the scope of recall 25V-274. Based on GM’s recall, ODI will close this PE. NHTSA will continue to investigate complaints of engine failure outside the scope of recall 25V-274 as part ofEngineering Analysis (EA25007). To review the ODI reports cited in the Closing Resume ODI Report Identification Number document, go to NHTSA.gov.

The contact owns a 2021 Chevrolet Suburban. The contact stated that while his wife was driving 40 MPH, the vehicle stalled. An unknown warning light was illuminated during the failure. The vehicle was towed to an independent mechanic and was diagnosed with fuel pump failure. Additionally, the independent mechanic removed the front cover and became aware that the timing chain was laying at the bottom of the oil pan. The contact stated that the failure was a known failure with the 6.2L engines. The contact associated the failure with NHTSA Action Number: EA26005. The manufacturer was aware of the failure by phone and referred the contact to the NHTSA Hotline. The failure mileage was approximately 166,000.

NHTSA ID

11776302

Incident

Nov 1, 2026

Mileage

166,000 mi

On August 25, 2026, I was driving a chevrolet 2021 with less than 60K miles on it on a double lane road when I came to a red light, the car did not move when the light turned green, I put the car on park then drive again and it completely shut down. Prior to this there was no lights showing any issues with the car. It did not drive again, and I had to have it towed home then to a body shop where I spent 2K and drove the car out but was told to take it to the dealer immediately. At the dealer they said it needed a complete engine or motor replacement that cost 12k but they would cover about 8k and I would be responsible for about 4k. I was called to pick it up and it was still making a weird noise they said it was something else, it is November 3, 2026, the dealer still has my car,and they won't even answer the phone, no loaner available, and I am terrified after hearing so many stories about 6.2L engines that I will be driving a car that can put me at risk even after replacement. please help me.

NHTSA ID

11775455

Incident

Aug 25, 2026

Shuddering and vibration between 25-40mph during low acceleration. Seems to be getting worse. Have an appointment with a dealership to do a diagnostic and can upload that information later. Service advisor suggested that it is an extremely common problem in my vehicle and very expensive to fix.

NHTSA ID

11774588

Incident

Mar 1, 2026

In the evening I was driving home locally and noticed a slight lurch in the car when coming to a complete stop at the stoplight. From there I proceeded into my neighborhood. There was a sudden and very loud bang sound like metal and an explosion. Immediately the engine failed and my vehicle stopped in the middle of the road. I also smelled a lot of gasoline. I was unable to shift the vehicle into neutral to move it off the road. I called a tow through AAA. Luckily I was not on the freeway or a busy road when this happened as it could have caused an accident. My vehicle is at a certified chevrolet service center where they confirmed their opinion is the timing chain snapped and destroyed my engine. They are recommending a complete motor replacement. The vehicle is available for inspection upon request. This vehicle is the same year make and model as a previous recall in 2025 however I am curious as to why my VIN is not included in this recall.

NHTSA ID

11774511

Incident

Oct 8, 2026

Failing coolant flow control valve. This is a known issue affecting the same engine and model year and VIN is not covered. This is ridiculous.

NHTSA ID

11773903

Incident

Oct 8, 2026

GOT CODE AND ENGINE LIGHT. P1098 FOR ENGINE COOLANT CONTROL VALVE POSITION SENSOR. GM SUPPOSEDLY ADDED A 15 YEAR WARRANTY EXTENSION FOR THIS VALVE AS IT HAS FAILED ON MANY VEHICLES. SPECIAL COVERAGE # N352508341 SHOWS AND SAYS IT SHOULD COVER 2021-2023 SUBURBANS. CHECKED WITH DEALERSHIP AND THEY SAY ITS NOT COVERED. WHY NOT? ITS LIKE A $1300 REPAIR. MINE SHOULD BE COVERED AS WELL. ID LIKE TO REGISTER A COMPLAINT REGARDING THIS

NHTSA ID

11773751

Incident

Oct 25, 2026

I was driving 60 miles per hour on the 101 highway around 8:30AM and a couple error messages suddenly appeared on my dash - one regarding traction control and the other regarding ESC. My engine light continuously flashed. I took the car into the dealership and they requested 3K to take apart the engine to figure out the issue. They now state that the number four cylinder lifters and the camshaft are pitted and thus the cylinder walls of the engine are scratched and thus the cylinder block can not be reused and needs to be replaced. They are requesting an additional 17,000 to replace the engine entirely. There was a recall on this vehicle for March 2021-2024 vehicles. Mine is just outside that recall being manufactured in January or Feburary 2021. Clearly, my issue is suffering the same problem from this recall.

NHTSA ID

11773294

Incident

Oct 21, 2026

Car misfired and had ticking noise. Car began to consistently shake when I was on the highway. Known issue 2021 Chevrolet Suburban. V8 engine. Dynamic Fuel Management Lifter failure. Driving on the 101 highway and an error message for traction was relayed on dash, followed by ESC error, followed by blinking engine light. It happened in the span of seconds with no prior alerts. Dealership had to take apart the engine for 3,300 to find the reason and repair is an addition 4,000.

NHTSA ID

11773196

Incident

Oct 21, 2026

This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming on. Technician may find Diagnostic Trouble Codes B3055, B3

This Preliminary Information provides diagnostic tips and guidance for situations where key fobs cannot be learned or programmed successfully.

This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.

This preliminary information communicates diagnostic tips for air leveling suspension system.

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues