2023 Chevrolet Suburban

My 2023 Chevrolet Suburban RST equipped with the 6.2L V8 engine has developed serious transmission and drivetrain issues following an engine replacement performed under a GM recall approximately one year ago. Shortly after the engine replacement, the transmission began exhibiting unusual shifting behavior. The dealership advised that the transmission needed to reset or relearn its shifting patterns. However, approximately 10,000 miles later, the problems have continued and become increasingly concerning.The vehicle now shifts extremely hard when engaging Drive or Reverse and experiences harsh, abrupt shifts while driving. More concerning, the rear wheels have appeared to lock up unexpectedly on multiple occasions at low speeds, creating a dangerous situation where the driver could lose control of the vehicle or be struck by another vehicle. I reported these problems to the Chevrolet dealership, but I was informed that they could not reproduce the issue or identify any diagnostic trouble codes. Despite these serious symptoms, the underlying problem remains unresolved. I am concerned that this may be a transmission, torque converter, transmission control module, or drivetrain defect affecting other GM vehicles equipped with similar powertrains. I am requesting that NHTSA investigate these potentially dangerous failures, particularly the unexpected drivetrain locking and severe transmission engagement issues, before they result in a serious accident or injury.

As I was driving on the Highway. My speed was approximately 65 MPH. The suburban slowed itself down and flashed on the driver screen "slow down/reduced acceleration". I was driving with my family in the car on the highway. The car forcing a slow down like that could have caused an accident that could have killed my 3 year old or my 9 year old. We drove the car home in fear after reading online that the rear tires could force stop on us. We immediately did an at home diagnostic on the vehicle and were given the following codes: P0700, P0747. We have taken the vehicle to the nearest Chevrolet Dealership and had it diagnosed. We were called today and told that the valve body needs replacement. There were no prior warnings or other symptoms of the problem prior to the failure. We've had it serviced at this dealership, had any recalls checked at this dealership and no warnings had been provided.

I was driving south on Highway 395 with 2 of my friends on our way home from vacation, which is a 2 lane road in the mountains. About 45 miles north of Victorville, CA. As I was accelerating, my vehicle all of a sudden dropped adaptive cruise control, the engine light started blinking, traction control errored, and I got a service ESC message on the dash. I let off the gas a little and everything seemed fine but when I reapplied pressure to the gas pedal the engine started making a loud ticking sound and had barely any propulsion. I had to keep going and was luckily able to find a safe place to pull off the road (which had many blind curves and minimal shoulder space along the highway). Had there not been a safe place to pull over before the engine completely died we could have been hit by any of the many semi trucks traveling on that road. After waiting 2 hours for a tow truck and having the vehicle towed to the Chevrolet dealer in Victorville, I was provided a small SUV rental vehicle to drive the remaining 150 miles home while I left my 2023 Suburban High Country for them to disassemble. When I called the next day they verified there was a Rod Bearing Failure inside the engine and they were submitting to GM for engine replacement. There were NO symptoms before the engine failure happened.

Transmission / Electronic Shifter Control While attempting to operate my 2023 Chevrolet Suburban, the vehicle suddenly suffered a complete transmission shift lockout, displaying a critical driver alert on the dashboard stating: "Conditions Not Correct for Shifting." The vehicle actively blocked and refused engagement into Reverse gear. A diagnostic scan revealed (P0776) transmission solenoid and hydraulic control codes, and the Chevrolet owner's application triggered a "Service Engine/Transmission" warning. This issue is identical to the widespread, known manufacturing defect involving premature wear of the 10-speed transmission control valve body. General Motors has already acknowledged this severe defect by issuing a major safety recall and extended warranty program (Campaign N242454440 / N242454441) due to internal fluid pressure drops that can cause sudden rear-wheel lockup or an abrupt loss of motive power. Safety Hazard: The sudden and unpredictable failure of the electronic shifter and transmission control modules to authorize or maintain gears poses an extreme, unreasonable safety hazard. An unexpected loss of gear engagement—or a sudden command lockout while operating the vehicle in a roadway, intersection, or active traffic pattern—leaves the driver completely unable to maneuver out of harm's way, drastically increasing the risk of a severe rear-end or side-impact collision. Request for Action: Although General Motors currently limits their safety recall and special coverage campaigns for this valve body defect to the 2020–2022 model years, my 2023 model utilizes the exact same transmission architecture and is exhibiting the identical component failure. I am urging the NHTSA to initiate an Engineering Analysis / Recall Query to force General Motors to expand their safety recall parameters to include 2023 VINs before these component failures result in catastrophic highway accidents or injuries.

Tuesday October 6th, 2026, I dropped my 2 children off at school and was driving on the highway to work through heavy traffic when I had a suddenly loud knocking coming from my car, transmission not wanting to shift properly, high rpm’s for extended periods of time. I was able to safely make it to the dealership with about 10 minutes, where it was determined L87 engine failure had occurred. I am sickened that this vehicle is advertised as a family vehicle, knowing the engine failure issues!

2023 Chevrolet Suburban, 6.2L L87, included in Recall 25V-274 and NHTSA EA26005. Recall service was performed XXX at 20,259 miles; the engine passed inspection and received the 0W-40 oil remedy. I noticed that the oil level was low after the dealer had serviced the engine so I topped it off. At the next oil change, at 26,297 miles, I observed a metallic sheen in the drained oil and found significant metal debris in the oil filter installed during the recall service. I captured and retained all the oil removed, 8 quarts were captured so there is no evidence of oil consumption. On XXX, at 26,505 miles, I presented the cut-open filter to the dealer (Burns Chevrolet, [XXX]). It was not examined. The dealer changed the oil and filter and instructed me to drive the vehicle 3,000 miles and return for inspection for metal. I am concerned that the vehicle is at risk of the loss of propulsion described in the recall, and that the recall remedy has not prevented ongoing bearing wear. A GM Customer Assistance case is open. The debris accumulated over approximately 6,000 miles on the recall-service oil fill. The dealer technician reported no visible metal in the oil drained on XXX, but did not examine either filter. I am retaining, sealed, the uncut filter the dealer removed on XXX, and the cut filter from the recall-service fill, as evidence. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving, the digital driver/instrument display behind the steering wheel went completely black, but the engine continued running and the radio remained on. The vehicle was stopped, turned off and restarted and the display screen came back on. This didn't effect the drivability of the vehicle. In some of the research I've found the cause might be an instrument-cluster software problem or an "Instrument Cluster Missing Graphics Processor". The recommended remedy would be to replace the instrument cluster. There is also one instance where the dealer reportedly determined that the instrument panel control module needed to be reset versus repaired which would not permanently resolve the issue.

The contact owns a 2023 Chevrolet Suburban. While the contact’s husband was driving 70-75 MPH and depressing the accelerator pedal, the vehicle failed to respond, but the RPMs became elevated. The driver shifted transmission into neutral(N), coasted to the side of the road, and the vehicle stalled. A message to “Start Vehicle” was displayed; however, while on the side of the road, the vehicle failed to turn off. The driver was able to shift into park(P) and had the vehicle towed to the dealer, where the transmission failed to shift out of park(P). The dealer determined that a spark plug was burned. The spark plug was replaced; however, before returning the vehicle, the new spark plug was also burned. The dealer then diagnosed the vehicle with engine failur. The dealer informed the manufacturer of the safety issue. The failure mileage was approximately 42,600.

Dear Chevrolet Customer Assistance, I am writing to formally report a serious safety incident involving my 2023 Chevrolet Suburban and to request an investigation by General Motors. My vehicle unexpectedly locked while the key fob was still inside the vehicle. Most concerning, my baby was also inside the vehicle at the time. I was unable to regain access to the Suburban, and because my baby was trapped inside, I had no reasonable option but to break a window to gain immediate access to her. This was an extremely serious and frightening situation. My primary concern is understanding how a 2023 Chevrolet Suburban equipped with a keyless entry system was able to lock while the key fob remained inside the vehicle. I am requesting that Chevrolet/General Motors: 1. Open a formal safety case regarding this incident. 2. Investigate why the vehicle locked despite the key fob being inside. 3. Have the vehicle’s keyless entry, passive locking system, key-detection components, software, and related systems inspected for a malfunction. 4. Determine whether there are any applicable recalls, technical service bulletins, software updates, or previously reported incidents involving similar circumstances. 5. Reimburse me for the cost of the broken window and related repairs, as the window had to be broken solely because immediate emergency access to my baby was necessary. I do not want this incident documented simply as a customer accidentally locking keys inside a vehicle. The key fob was inside the Suburban when the vehicle locked, and an infant was trapped inside as a result. I am asking that this be documented and investigated specifically as a potential vehicle safety or key-detection system issue. I can provide my VIN, photographs of the damage, repair invoices, key fob information, dealership inspection records, and any other documentation necessary for your investigation. Please provide me with a GM case number and written confirmation that this incident has been form

Engine locked up, need engine replaced. We already satisfied the recall with the 0w-40 oil update.

The vehicle experienced an initial incident of significant engine power loss while traveling at highway speeds approximately two weeks prior to the eventual complete engine failure. During that incident, the vehicle unexpectedly lost engine power while traveling at speeds exceeding 65 mph. On Thursday, September 3, 2026, a second incident occurred within approximately one-half mile of leaving my residence. The vehicle again experienced a significant loss of engine power. I had already notified the dealership of the this occurrence and had a scheduled appointment for repairs the following day. I was attempting to drive the vehicle to the dealership as planned. Shortly after leaving my neighborhood, I stopped at a nearby gas station after the vehicle displayed a "Low Oil Pressure" warning on the dashboard. I also subsequently received an email notification from OnStar identifying diagnostic trouble code (DTC) P0016. The vehicle was then driven again and subsequently experienced a catastrophic and complete loss of engine power while traveling at highway speeds above 65 mph. Following this failure, the engine would not turn over or crank and the vehicle could not be restarted. The sequence of events is significant because the vehicle had previously experienced engine power loss at highway speeds, the dealership had been notified of the initial incident, and the vehicle was being driven to the dealership for its scheduled repair appointment when the second power-loss event occurred. The vehicle subsequently suffered complete engine failure. I am documenting these events, including the dates, circumstances, dashboard warning, OnStar diagnostic notification, and sequence of failures, for purposes of establishing the history of the vehicle's mechanical problem and the circumstances leading to the catastrophic engine failure.

Complete engine failure on 2023 Chevrolet Suburban 6.2L. On October 31, 2024 while on the interstate. The truck shut off twice with no warning. I was able to make it to the side of the interstate twice to restart. The truck was taken to Serpentini Chevrolet and they stated no issues were found and send the vehicle back on the road. On December 13,2024 while on a state route, speed limit 55, 12,231 miles the Suburban abruptly slowed down and violently started to shake and knock. I pulled off to the side of the state route and waited approx 2 hours for the vehicle to be towed. The vehicle was towed to Serpentini Chevrolet and they stated the engine was blown and needed replaced. The vehicle was at the dealership until February 13, 2025 when the engine was replaced. The recall was released in April 2025 at which time the vehicle was taken in for the oil change “repair”. The truck now has 20,200 miles and is lacking power and starting to shake when accelerating from 0-50mph. I will be scheduling additional service in the coming week. While going through the blown engine, GM stopped responding to emails, did not compensate for months of payments I incurred while they had the vehicle and they are still selling unsafe vehicle.

The contact owns a 2023 Chevrolet Suburban. The contact stated that while entering a parking lot at a low speed, the engine shut off without warning. The vehicle was towed to a dealer, where it was diagnosed with engine failure, which was associated with NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The vehicle remained at the dealer for approximately three months before the engine was repaired. The contact stated that while driving recently, the vehicle hesitated upon depressing the accelerator pedal. No warning light illuminated. The dealer and the manufacturer were not notified of the recent failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 50,000.

After having the proper recall performed. The engine locked up while driving on interstate. Total loss of power in heavy traffic nearly causing an accident.

My 2023 Chevrolet Suburban equipped with the 3.0L Duramax diesel engine (LM2) has experienced a recurring engine oil leak involving the rear main seal/lower timing cover area. The vehicle has required repeated dealer repairs for substantially the same oil-leak condition, including major engine-related disassembly, but the leak has returned after repair. This is a safety concern because failure of the rear main seal or lower timing cover sealing system can result in loss of engine oil while the vehicle is being operated. A significant oil loss could potentially cause loss of oil pressure, engine damage or engine failure and resulting loss of propulsion while driving. Leaking engine oil also has the potential to contact hot engine or exhaust components, creating an additional safety concern. The problem has been inspected and confirmed by authorized GM dealerships and documented on multiple repair orders. This does not appear to be an isolated occurrence on this vehicle because substantially the same engine oil leak has required repair more than once. GM has previously issued service information, including Bulletin PIP5795, concerning rear main oil leaks on 3.0L LM2 Duramax engines where the rear main oil seal may move or become severely shifted out of position in the timing chain lower cover. I am concerned that repeated repair of this condition may not adequately address the underlying cause and that the oil leak could recur while the vehicle is being driven. I am requesting that NHTSA review complaints and repair data involving rear main seal/lower timing cover oil leaks on GM 3.0L Duramax-equipped vehicles to determine whether a broader safety-related defect exists.

Car died in middle of nowhere at high speeds

The contact owns a 2023 Chevrolet Suburban. The contact stated that the vehicle had experienced excessive oil consumption. The contact stated that while driving at various speeds, the vehicle chugged, jerked, and lunged forward. The vehicle was taken to the dealer; however, the failure could not be duplicated. The contact stated that the failure reoccurred. The vehicle was taken back to the dealer, where the spark plugs were replaced; however, the failure persisted. The dealer was notified of the failure and advised the contact that the spark plugs might need to be replaced. The contact stated that while driving and coming to a stop, the vehicle chugged, lunged forward, made an abnormal clicking sound, and almost struck another vehicle. The check engine warning light illuminated. The OnStar mobile APP displayed the messages "Engine and Transmission System - Please Schedule Service Now," "Transmission System Issue - Please Schedule Service Now," and "VVT Issue detected - Please Schedule Service Now". The contact was able to pull into a parking lot. The vehicle was taken to the dealer, where it was diagnosed with engine lifter failure. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 63,000.

6.2 V8 while operating threw multiple error codes, went into crawl mode unexpectedly.

The contact owns a 2023 Chevrolet Suburban. The contact stated that while driving approximately 65 MPH, the transmission erroneously shifted to neutral(N), and the vehicle decelerated unexpectedly. The vehicle was pulled off the freeway and parked on the shoulder of the road, and the police were contacted and arrived at the scene and assisted with removing the small children from the vehicle. The vehicle was later towed to a nearby towing lot. The contact later received messages on the App for transmission and engine failures. The cause of the failures was not yet determined. The local dealer was notified of the failure. The manufacturer was not yet contacted. The contact stated that the vehicle was previously serviced under the NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING); even though the vehicle had experienced the failure listed in the recall. The failure mileage was 25,300.

The contact owns a 2023 Chevrolet Suburban. The contact stated that the front passenger’s and rear driver’s side rims were cracked. The front passenger’s side rim was replaced by the dealer under warranty, while the rear driver’s side rim was replaced with an aftermarket part. The manufacturer was notified of the failures but declined assistance. The owner expressed concerns that the remaining factory rims might also crack and were prone to failure while driving. The failure mileage was approximately 100,000.