Trailer brake system is not working. Vehicle is reporting trouble code C159C and is subject to service bulletin PIT5948A per the dealership. The latest update states “GM is aware of the issue and is working on a resolution”. The latest update is almost 3 months ago. I have an active case with GM on this. Case sr:9-8884642509. Th…
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Trailer brake system is not working. Vehicle is reporting trouble code C159C and is subject to service bulletin PIT5948A per the dealership. The latest update states “GM is aware of the issue and is working on a resolution”. The latest update is almost 3 months ago. I have an active case with GM on this. Case sr:9-8884642509. They gave me a $300 credit to my Chevrolet account to purchase chevy parts however I want my truck working. Not being able to use the trailer brake system is very dangerous when towing and the fact that this is a $60,000 truck that I literally bought to tow my camper and can’t even tow with it safely defeats the purpose of my paying for this truck.
NHTSA ODI #11497922
Mileage unknown · Dec 15, 2022
Service Brakes
Purchased 2022 Chevrolet Silverado 1500 new on 10/4/2022. First used to tow on 10/7/2022 with less than 500 miles from new on vehicle. I hooked up our brand new camper (1 month old 2022 Grand Design Imagine) to the truck and the integrated trailer brake controller for the first time and a message appeared on DIC stating "Trail…
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Purchased 2022 Chevrolet Silverado 1500 new on 10/4/2022. First used to tow on 10/7/2022 with less than 500 miles from new on vehicle. I hooked up our brand new camper (1 month old 2022 Grand Design Imagine) to the truck and the integrated trailer brake controller for the first time and a message appeared on DIC stating "Trailer Brakes Disabled Service Required" and the trailer brakes disengaged. Restarted vehicle and the message west away, only to come back on the first time I applied the brakes. Dealership service department has been helpful in as much as they have evaluated both my truck and the camper. Found the truck integrated brake controller was not communicating properly and had a DTC of C159C. Dealership tested camper trailer brakes and found them to be working properly (as expected). Dealership service department states GM knows about this issue and has no known correction to the issue. They are keeping an open service ticket on this issue. In the interim the dealership service department has installed an aftermarket trailer brake controller so I do have trailer brakes until GM solves the issue.
NHTSA ODI #11497601
Mileage unknown · Dec 12, 2022
Service Brakes
When driving with a trailer connected to the truck, the DIC displays Trailer Brake Disabled Service required. Power to trailer brakes immediately ceases and the truck brakes are left to stop the truck and trailer. This is extremely dangerous for heavy loads at high speeds. Almost caused an accident due to this issue. Unable to u…
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When driving with a trailer connected to the truck, the DIC displays Trailer Brake Disabled Service required. Power to trailer brakes immediately ceases and the truck brakes are left to stop the truck and trailer. This is extremely dangerous for heavy loads at high speeds. Almost caused an accident due to this issue. Unable to use truck to tow out of fear for safety. Trailer was tested and inspected. Trailer was also used by another truck with no issue. Connected the truck to a different trailer with brakes and the problem replicated with the other trailer.
NHTSA ODI #11497146
Mileage unknown · Dec 8, 2022
Service Brakes
The integrated trailer brake system will quit working mid tow. The warning something along the line of "service trailer brake, trailer brakes disabled" comes on and at that point I no longer have use of the trailer brakes while towing. This is very unsafe as I am regularly towing 4000-6000lbs. GM does not have a solution to the …
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The integrated trailer brake system will quit working mid tow. The warning something along the line of "service trailer brake, trailer brakes disabled" comes on and at that point I no longer have use of the trailer brakes while towing. This is very unsafe as I am regularly towing 4000-6000lbs. GM does not have a solution to the problem at this time and has been no help resolving the issue. I have been told "hopefully there will be a solution soon."
NHTSA ODI #11496571
Mileage unknown · Dec 5, 2022
Electrical SystemService Brakes
My 2022 Silverado is affected by a couple different electronic safety issues. The first one has to do with the trailering system. When I have trailer connected that has electronic brakes on it, the vehicle gives an error message and then shuts the break control off. When this happens the trailer does not assist the truck in brea…
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My 2022 Silverado is affected by a couple different electronic safety issues. The first one has to do with the trailering system. When I have trailer connected that has electronic brakes on it, the vehicle gives an error message and then shuts the break control off. When this happens the trailer does not assist the truck in breaking when the pedal is pressed. The truck has to do all the work to stop not only itself, but the weight of the trailer as well. I found this out while towing my camper that weighs approximately 7500lbs. This is very dangerous and unsafe. The GM dealership has verified this issue and gave me a bulletin that came from GM that states that they are aware of the issue and they do not no what is causing it or how to fix it. I also have issues with my smaller trailers that have no brakes. When connected, the vehicle will give me random error messages about the trailer lighting. When this happens the trailer lights flash without me pressing the brakes or using turnsignals. This also is a huge safety issue. People following me may not know if I am turning or stopping, which could lead to an accident. The dealership also confirmed this issue and they believe it may be tied to the other issue outlined in GMs bulletin. The bulletin doesn't say anything about trailer lights, so the dealership has no clue on what is causing it or how to fix it. The last issue is with the back up camera. It goes out periodically while backing up. This can lead to me hitting someone or something that I may not see in my mirrors. My vehicle is a truck and is pretty large. The backup camera is there to help in backing safety. The dealership did confirm this issue with a code in the computer, but they couldn't get it to replicate while it was in the shop so they are unable to get solution to fix it. I have to wait until it completely goes bad or GM releases a bulletin. I know I'm not the only one with this issue. It is documented on a few forums. I have a case with GM.
NHTSA ODI #11496139
Mileage unknown · Dec 5, 2022
Service Brakes
Started vehicle and all of the brake system warning lights were on. Vehicle stated that I could drive 43 mph with limited braking ability and limited steering. Basically the power assisted brakes and steering would not work. The vehicle was parked at my place of employment. Called the dealer to ask for suggestions. Ask discussin…
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Started vehicle and all of the brake system warning lights were on. Vehicle stated that I could drive 43 mph with limited braking ability and limited steering. Basically the power assisted brakes and steering would not work. The vehicle was parked at my place of employment. Called the dealer to ask for suggestions. Ask discussing it we decided to take it to the dealership. That was a good idea as there was not enough braking power to stop the pick up in an emergency situation. It took all I could to get it to stop. Pedal to the floor and hold it tight. The Service Manager decided it should stay as driving it was terribly dangerous. I was told it needed a new ECS. The vehicle shouldn't be driven in this state. What if this was to happen on the highway while pulling a trailer. This would put the driver, passengers and others at severe risk. Something needs to happen. Once it's fixed do I even trust it anymore?? GM KNOWS ABOUT IT
NHTSA ODI #11496123
Mileage unknown · Nov 28, 2022
Service Brakes
GM is rolling trucks off the production line with a known trailer brake controller fault. This issue causes the truck to lock out the trailer braking function immediately after applying braking with a trailer attached. This causes stopping distance to be dramatically increased resulting in greater risk of an accident. GM needs t…
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GM is rolling trucks off the production line with a known trailer brake controller fault. This issue causes the truck to lock out the trailer braking function immediately after applying braking with a trailer attached. This causes stopping distance to be dramatically increased resulting in greater risk of an accident. GM needs to correct this issue before loss of life occurs. This seems to be wide spread. https://www.gm-trucks.com/forums/applications/core/interface/file/attachment.php?id=166822&key=85381e43bf444ec4cbd8ddc48e53190b
NHTSA ODI #11495114
Mileage unknown · Nov 23, 2022
Electrical SystemService Brakes
While towing a 7500lb trailer the trailer brakes quit working. The module says trailer brakes disconnected. Servive teailer brakes. Gm dealer diagnosed, said they are aware of the problem. Issued a bulletin PIT5948A. But there is no fix available. This could kill someone.
NHTSA ODI #11494761
1,750 miles · Nov 15, 2022
Service BrakesTrailer Hitches
The contact owns a 2022 Chevrolet Silverado 1500. The contact stated that the trailer braking system failure warning light was illuminated. The contact took the vehicle to the dealer who diagnosed that there was an integrated trailer brake system failure. The vehicle had not been repaired due to the manufacturer not having a fix…
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The contact owns a 2022 Chevrolet Silverado 1500. The contact stated that the trailer braking system failure warning light was illuminated. The contact took the vehicle to the dealer who diagnosed that there was an integrated trailer brake system failure. The vehicle had not been repaired due to the manufacturer not having a fix for the failure. The manufacturer was not made aware of the failure. The approximate failure mileage was 1,750.
NHTSA ODI #11493696
Mileage unknown · Nov 11, 2022
Service Brakes
On 11/10/2022 I was driving in moderate to heavy traffic at low speed; approximately twenty (20) mph. I applied the brakes and immediately experienced a hard pedal coupled with some pulsating. I pressed the pedal as hard as I could as there was traffic stopped in front of me. At the same time every warning light illuminated on t…
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On 11/10/2022 I was driving in moderate to heavy traffic at low speed; approximately twenty (20) mph. I applied the brakes and immediately experienced a hard pedal coupled with some pulsating. I pressed the pedal as hard as I could as there was traffic stopped in front of me. At the same time every warning light illuminated on the dashboard. My truck stopped just short of colliding with the other vehicle in front of me. The message displayed on the dash read “Brake System Failure” followed by a second message which read “Trailer Brake Failure”, and then an additional message that read “Do not exceed 42 mph”. Fortunately there was a Chevy dealership nearby. I drove the vehicle at very low speed to their service department and currently wait a diagnosis. My Chevrolet app also sent me a text at the time of the incident which read “Diagnostic Alert: Service the Antilock Braking System in your 2022 Silverado within 1 day”. My experience is similar to another incident which was reported to your agency in September of this year involving the same model truck. Note: I was not pulling a trailer at the time of the incident.
General Motors, LLC is recalling certain 2020 Chevrolet Silverado 2500, 3500, GMC Sierra 2500, 3500, and 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles that may have been repaired incorrectly under recall 24V797. The transmission control valve may fail and cause the rear wheels to lock up.
Consequence & remedy
Consequence: Rear wheel lock up increases the risk of a crash.
Remedy: Dealers will inspect the vehicles and update the transmission control software, free of charge. Owner notification letters were mailed March 6, 2026. Owners may contact GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N252516560. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on February 12, 2026.
Additional source detail variants (2)
Power Train:automatic Transmission:fluid/lubricant:valves/valve Body
General Motors, LLC is recalling certain 2020 Chevrolet Silverado 2500, 3500, GMC Sierra 2500, 3500, and 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles that may have been repaired incorrectly under recall 24V797. The transmission control valve may fail and cause the rear wheels to lock up.
Consequence: Rear wheel lock up increases the risk of a crash.
Remedy: Dealers will inspect the vehicles and update the transmission control software, free of charge. Owner notification letters were mailed March 6, 2026. Owners may contact GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N252516560. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on February 12, 2026.
Power Train:automatic Transmission:control Module:software
General Motors, LLC is recalling certain 2020 Chevrolet Silverado 2500, 3500, GMC Sierra 2500, 3500, and 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles that may have been repaired incorrectly under recall 24V797. The transmission control valve may fail and cause the rear wheels to lock up.
Consequence: Rear wheel lock up increases the risk of a crash.
Remedy: Dealers will inspect the vehicles and update the transmission control software, free of charge. Owner notification letters were mailed March 6, 2026. Owners may contact GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N252516560. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on February 12, 2026.
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.
Consequence & remedy
Consequence: 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.
General Motors, LLC (GM) is recalling certain 2020-2022 Chevrolet Silverado 1500, 2500, 3500, GMC Sierra 1500, 2500, 3500, 2021 Cadillac Escalade, Escalade ESV, Chevrolet Tahoe, Suburban, GMC Yukon, and Yukon XL vehicles equipped with diesel engines. The transmission control valve may fail and cause the rear wheels to lock-up.
Consequence & remedy
Consequence: Rear wheel lock-up can increase the risk of a crash.
Remedy: Dealers will install new transmission control module software, free of charge. GM will provide a special coverage program to cover the repair of transmissions that are identified by the remedy software as containing a defective control valve. Owner notification letters were mailed December 12, 2024. Owners may contact GM customer service at 1-888-988-7267, Cadillac customer service at 1-800-458-8006, GMC customer service at GMC 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N242454440.
Additional source detail variants (2)
Power Train:automatic Transmission:fluid/lubricant:valves/valve Body
General Motors, LLC (GM) is recalling certain 2020-2022 Chevrolet Silverado 1500, 2500, 3500, GMC Sierra 1500, 2500, 3500, 2021 Cadillac Escalade, Escalade ESV, Chevrolet Tahoe, Suburban, GMC Yukon, and Yukon XL vehicles equipped with diesel engines. The transmission control valve may fail and cause the rear wheels to lock-up.
Consequence: Rear wheel lock-up can increase the risk of a crash.
Remedy: Dealers will install new transmission control module software, free of charge. GM will provide a special coverage program to cover the repair of transmissions that are identified by the remedy software as containing a defective control valve. Owner notification letters were mailed December 12, 2024. Owners may contact GM customer service at 1-888-988-7267, Cadillac customer service at 1-800-458-8006, GMC customer service at GMC 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N242454440.
Power Train:automatic Transmission:control Module:software
General Motors, LLC (GM) is recalling certain 2020-2022 Chevrolet Silverado 1500, 2500, 3500, GMC Sierra 1500, 2500, 3500, 2021 Cadillac Escalade, Escalade ESV, Chevrolet Tahoe, Suburban, GMC Yukon, and Yukon XL vehicles equipped with diesel engines. The transmission control valve may fail and cause the rear wheels to lock-up.
Consequence: Rear wheel lock-up can increase the risk of a crash.
Remedy: Dealers will install new transmission control module software, free of charge. GM will provide a special coverage program to cover the repair of transmissions that are identified by the remedy software as containing a defective control valve. Owner notification letters were mailed December 12, 2024. Owners may contact GM customer service at 1-888-988-7267, Cadillac customer service at 1-800-458-8006, GMC customer service at GMC 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N242454440.
General Motors, LLC (GM) is recalling certain 2020-2023 Cadillac CT4 and CT5; 2021-2023 Buick Envision; and 2022-2023 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon, and Yukon XL vehicles. The daytime running lights (DRLs) may not deactivate when the headlights are on. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
Consequence & remedy
Consequence: DRLs that do not deactivate as intended may result in a glare, reducing visibility, and increasing the risk of a crash.
Remedy: The body control module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed January 23, 2023. Owners may contact GMC customer service at 1-888-988-7267, Chevrolet customer service at 1-800-222-1020, or Cadillac customer service at 1-800-458-8006. GM's number for this recall is N222386380. This recall expands previous recall number 22V-827.
General Motors, LLC (GM) is recalling certain 2022 Chevrolet Silverado 1500 vehicles. The sensing diagnostic module (SDM) was left in manufacturing mode and not activated at the assembly plant prior to shipment. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
Consequence & remedy
Consequence: An SDM in manufacturing mode will not deploy the vehicle's air bags in a crash, increasing the risk of occupant injury.
Remedy: Dealers returned the vehicles to the GM assembly plant and the sensing diagnostic modules were activated. The vehicles had not been sold from dealer inventory and therefore no owner letters will be mailed. Owners may contact Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N222387870.
General Motors (GM) has decided that certain 2022 model year Chevrolet Silverado, and GMC Sierra vehicles equipped with an accessory sport bar. The accessory sport bar contains a high-mounted brake light that may not function. In addition, it may block the vehicle's existing high-mounted brake light. As such, these vehicles may fail to conform to Federal Motor Vehicle Safety Standard (FMVSS) number 108, "lamps, reflective devices, and associated equipment."
Consequence & remedy
Consequence: An inoperative high-mounted brake light can reduce visibility to other drivers and increase the risk of a crash.
Remedy: Dealers will inspect the installation of the accessory bar and provide the correct vehicle wiring, if necessary, free of charge. Interim owner notification letters advising owners of the safety risk were mailed on August 10, 2022. Owner notification letters were mailed on January 27, 2023. Owners may contact GM's customer service on 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020.. GM's recall number for this recall is N222368110.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
4
EA26005 · Loss Of Motive Power Due To Engine Failure Post Recall Remedy
Opened Aug 20, 2026 · No close date supplied
Status: open (inferred from source dates) · Engine
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.
RQ26001 · Loss Of Motive Power Due To Engine Failure Post Recall Remedy
Opened Jan 16, 2026 · Closed Aug 20, 2026
Status: closed (inferred from source dates) · Engine
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.
EA25007 · Loss Of Motive Power Due To Engine Failure
Opened Oct 23, 2025 · No close date supplied
Status: open (inferred from source dates) · Engine; Engine And Engine Cooling:engine:hard Parts Internal/mechanical
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.
Additional source detail variants (2)
Engine And Engine Cooling:engine:hard Parts Internal/mechanical
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.
Engine
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.
PE25001 · Loss Of Motive Power Due To Engine Failure
Opened Jan 16, 2025 · Closed Oct 23, 2025
Status: closed (inferred from source dates) · Engine; Engine And Engine Cooling:engine:hard Parts Internal/mechanical
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.
Additional source detail variants (2)
Engine And Engine Cooling:engine:hard Parts Internal/mechanical
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.
Engine
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.
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