2021 CHEVROLET TAHOE Engine Problems

While driving home late at night, the vehicle experienced a sudden mechanical failure in the engine. I was traveling approximately 2 miles per hour while slowing to stop at a stop sign when there was a loud “clunk,” followed by an abrupt stop of the vehicle. Immediately after this occurred, multiple dashboard warning lights illuminated, and a knocking sound began coming from the engine. The vehicle is currently not operating normally and is available for inspection upon request. This incident occurred late at night while I was driving with my two young children in the vehicle. The sudden and unexpected stop put us at risk of being rear-ended or stranded in an unsafe location. The loss of normal vehicle operation created a dangerous situation, especially given the time of night, location, and the presence of my children. There were no warning lights, messages, or noticeable symptoms prior to the incident....

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving and attempting to slow down to approximately 35 MPH, there was an abnormal clunking sound coming from the vehicle. The contact believed that the sound was caused by ice buildup on the mud flap, but shortly afterwards, the engine revved unexpectedly, with the check engine warning light illuminated, and the message “Reduce Acceleration - Drive with Care” was displayed. The vehicle started to coast unintendedly. The contact stated the vehicle returned to normal operation after a short while. The vehicle was taken to a local dealer to be diagnosed. The mechanics pushed the vehicle out of the parking spot before inspecting the vehicle. The vehicle was diagnosed with transmission valve body failure. The contact was informed that the transmission valve body needed to be replaced. The vehicle was not repaired. The manufacturer was contacted and referred the...

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while his wife was driving out of the driveway and driving approximately 20 MPH, the driver became aware of an abnormal flapping sound that became louder as the vehicle accelerated. Additionally, the contact stated while his wife was driving approximately 60-65 MPH on another occasion, the check engine warning light illuminated. The driver pulled over to the side of the road. The vehicle was towed to the residence, where a mobile independent mechanic diagnosed the vehicle with a misfire in cylinder #8. The mechanic determined that both sides of the engine lifters, the gaskets, and other unknown parts needed to be replaced. The vehicle was not repaired due to the cost. The dealer and the manufacturer were not contacted. The vehicle warranty company was contacted and informed the contact that the vehicle was not covered under warranty. The failure...

1ST ISSUE: 9/2025, after driving from another city to my home at 55-75 mph. As I pulled up home, the car just stalled and wouldn't start. I googled issue to find out it was a commonly known issue by GM. If fuel pump control module had happened while driving faster and not on my street to roll up to curb. I would have or could have been deadly. I find out what part # and local dealer knew there was a recall but told me he never heard about it and charged me for part. I installed in front of home on street and have been trying to get money back after reporting to GM I repaired my fuel pump control module and have been trying to get my money back from a repair done on 9/29/2025 by me. GM says it's looking into still after I keep calling them...

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.

Lost Power. Engine went into a limp mode. Engine starting knocking loudly and service esc came up on dash along with check engine light. Took it to the dealer and they said a lifter spun and damaged the camshaft. Dealer says it’s not covered by recall. Vehicle has been in Chevy dealer garage for 2 weeks and no repair yet.

While driving normally, the vehicle developed engine performance issues and was diagnosed with a catastrophic camshaft failure at approximately 85,000 miles. The vehicle has received regular oil changes with full documentation and has not been abused or neglected. A licensed mechanic confirmed that the camshaft was severely worn and damaged, consistent with AFM/DFM lifter failure, which is a known issue on GM V8 engines. This failure caused significant internal engine damage requiring major repair. The failed camshaft has been retained as physical evidence. A camshaft should not fail prematurely under proper maintenance. This appears to be a manufacturing or design defect, not normal wear and tear, and presents a potential safety concern due to sudden loss of engine power.

2021 Chevy Tahoe RST. Bad lifter valve, warranty not wanting to cover replacement for new one.

6.2l motor blew up set at dealership for 4 months no motor to fix it. finally got it back with in 10 days the torque converter need replaced in the transmission. out of service out f service for motor june 19 2025 got it back october 20 2025. transmission went out 10mdays later

* Sudden Catastrophic Engine Failure. * The car lost power in the middle of a high traffic, very dark country road, forcing her to stay in the middle of the (undivided) road in the dark hoping cars didn't slam into her. A Collin County Sheriff was dispatched to keep her safe until the tow truck arrived almost two hours later." * The vehicle was towed to a dealer where they confirmed that the torque converter, valves, lifters had failed. Dealer didn't disclose that there was any issues for these engines, which there is. It's a 6.2L V8 Tahoe High Country. * It has only been inspected by the dealer, not the manufacturer, police, insurance representatives, etc... * The vehicle indicated a traction control problem, then the engine light came on, and then the engine failed followed by loss of power. All happened in rapid succession WITH NO OPPORTUNITY FOR THE...

While driving on I-90 in Montana on a clear, sunny day at the posted speed limit of 80 miles per hour for one hour, the vehicle began making knocking noises then, all of a sudden lost power. Upon inspection at the nearest GM dealership service department in Butte, MT, I was told something within the engine broke. I have attached an emailed repair bid from the GM service department and have copied and pasted the highlights here: -Engine, Lines, Radiator, Water Pump, and Tune up ($14,400.00) -Cam, Lifters, Lines, Radiator, Water Pump, and Tune Up ($11,400.00) -Master Cylinder/EBCM ($3,310.00) Previous to the incident, all recommended and routine maintenance was performed at intervals recommended by GM and by GM dealership service departments and/or the Valvoline Oil Change location in Missoula, Montana. The odometer reading was between 95,000 and 96,000 miles at the time of incident.

AFM lifter collapse on Cylinder 6 Written repair estimate or a Diagnostic report showing P0306 + lifter failure

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

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving 20 MPH into the driveway, the engine seized. The contact stated that the service traction, service ESC, and engine warning lights were illuminated. Upon research, the contact associated the failure with NHTSA Action Number: EA25007 (Engine, Engine and Engine Cooling). The vehicle was towed to the local dealer, where it was diagnosed, and DTC: P0300, P050D, and P0302 were retrieved. The vehicle was not repaired. The manufacturer was notified of the issue and offered to help with the cost of the repair. The approximate failure mileage was 64,572.

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 assembly was found to have failed and need replacement.

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.

I am writing to formally document serious engine defects I have experienced with my 2021 Chevrolet Tahoe equipped with the 5.3L L84 V8 engine. 1.Crankshaft Failure: My Tahoe suffered a catastrophic crankshaft failure that required major repair/replacement. I am aware that GM has recalled certain vehicles equipped with the 6.2L L87 engine for crankshaft and rod-bearing defects. Based on my experience, the same or a very similar defect has also occurred in my 5.3L engine, which is currently not included in that recall. 2.Valve Lifter Failure: In addition, my vehicle has suffered from valve lifter collapse—a well-documented problem in 2021–2022 GM trucks and SUVs with both the 5.3L and 6.2L engines. This caused severe misfiring, drivability issues, and expensive repair needs. Why this is a concern: •Both failures occurred well before what would be expected of a modern engine. •The crankshaft failure raises a safety risk: sudden loss of propulsion...

1. What component or system failed or malfunctioned, and is it available for inspection upon request? Answer: The vehicle’s 6.2L L87 V8 engine suffered a sudden internal mechanical failure involving the connecting rod, rod bearings, and crankshaft assembly, resulting in catastrophic engine damage. The failure mode is consistent with the defect described in GM Recall N252494001. The engine and all damaged components are fully available for inspection upon request. 2. How was your safety or the safety of others put at risk? Answer: The engine failed without warning while the vehicle was in motion, causing an immediate loss of propulsion. This created a hazardous situation where the vehicle could no longer accelerate or maintain speed in traffic, increasing the risk of a rear-end collision or loss of vehicle control. GM’s own recall documentation identifies this exact failure mode as a significant crash risk, and that same hazard occurred in my...

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving at 70 MPH, the vehicle failed to accelerate as intended while depressing the accelerator pedal. The message “Service Electronic Stability Control" was displayed, and the traction control warning light and the check engine warning light were illuminated. The failure persisted while driving, and the vehicle failed to exceed 50 MPH. The vehicle was taken to an independent mechanic who diagnosed that the lifters had failed, the camshaft had failed, and there was a misfire in cylinder #5. The vehicle was not repaired. The vehicle was towed to the residence and had not been driven since. The manufacturer was not notified of the failure. The failure mileage was approximately 143,000.

The rear differential makes a rubbing or humming noise when turning left/right at slow speed especially when it’s cold.

I am submitting this complaint to the National Highway Traffic Safety Administration (NHTSA) regarding a sudden engine failure in my 2021 Chevrolet Tahoe equipped with a 6.2L V8 engine, which posed a serious safety risk. I was driving on the highway at approximately 65 mph with cruise control engaged. Suddenly, the vehicle lost all power, disengaging the cruise control, and the check engine light began flashing rapidly. I managed to exit the highway safely. While stopped at a traffic light, preparing to turn into a nearby repair shop, the car started shaking violently from side to side, making it difficult to control. I took the vehicle to a Firestone shop and a local Chevrolet dealer, both of which diagnosed massive engine failure and indicated that the engine will most likely need to be replaced. The symptoms I experienced—sudden loss of power at highway speeds, flashing check engine light, and violent...

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving at an undisclosed speed, several unknown warning lights illuminated. In addition, the contact noticed an abnormal ticking sound. The vehicle was towed to an independent mechanic, where the vehicle was diagnosed with a misfire in cylinder #7. The independent mechanic checked the spark plugs and other unknown parts for failure; however, there was no evidence of a failure. The contact was informed of a valve lifter failure. The contact was informed that the valve lifter and possibly the push rods and camshaft needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure but provided no assistance. The contact referenced Technical Service Bulletin: N212353840; however, the VIN was not included. The contact was advised to contact the NHTSA Hotline to report the failure. The failure mileage was approximately 87,893.

My tahoe is throwing a low engine oil code and burns through about 2 quarts of oil in between oil changes. other tahoes of the same year make and model have been recalled for the same issue but mine was not.

We have experienced a loss in power that is accompanied with an audible engine knocking sound. The loss of power affected our ability to safely merge into the highway.

On the morning of 1 Oct, I had left the house here in Cedartown GA to head to a meeting in Atlanta with a customer. I had started the truck 15 minutes before departing just as we have always done to our vehicles over the years to allow them to warm up properly. I departed Doyle Rd onto Hwy 27 South heading towards interstate 20. About 15 miles from the house I was at a steady cruise speed of 45 MPH, no traffic, acceleration or deceleration and the stability control system light came on, one second later the engine light came on and the engine all of a sudden started making a loud grinding and clunking noise. I was on the inside lane so let the car pass next to me and started to pull over onto the shoulder of the road. I immediately shut off the truck, popped the...

We just recently had the cam shaft and lifters replaced, as the vehicle began experiencing a knocking sound. The repair was supposedly completed, and they gave the truck back. We took the truck back in within a week, bc we continued to hear the sound. They sent it back saying they didn’t hear anything after test driving it. Over the weekend the car shut off after beginning to shake uncontrollably. Now supposedly the camshaft bearing is gone, and the truck experience engine failure. I spoke with someone previously, as the issue being repaired hundred thousands of cars were recalled for the same issue. I was told that it wasn’t on the same line, even though my truck was experiencing the EXACT issue and fell under the years. We were placed back on the road with our family, with a vehicle

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while his wife was driving at undisclosed speeds, there was an abnormal ticking sound coming from the vehicle. The check engine warning light was illuminated. The vehicle was taken to the local dealer, where it was diagnosed, and determined that the cylinder #1 left side lifters and push rod had collapsed. The lifters and push rod assembly were replaced. The contact stated that on a separate occasion, while driving at undisclosed speeds, there was an abnormal ticking sound coming from the vehicle, and the check engine warning light illuminated. The vehicle was taken to the local dealer, where it was diagnosed, and determined that cylinder #4 lifters had detached, and the push rod was bent. The vehicle was repaired. The contact stated that the engine was consuming an excessive amount of engine oil. The contact related the failure to...

Driving car, suddenly when accelerating engine light started flashing, car was shaking and making knocking noise

2021 to 2024 has had countless problems with the 6.2l engine. General Motors has put a stop of sale on vehicles with this engine. When I purchased the car the wrong oil was in the car which always burned off with 2 months after an oil change. They figured out the right oil but the damage has already been done.

I drive a 2021 Chevrolet Tahoe. This occurrence has happened on three separate occasions and each time it was raining outside. The first occurrence, my vehicle was running and parked in the rain after driving approximately 5 miles. While parked my check engine light came on with a series of warnings: service ECS, service traction control, forward collision system unavailable, reduced acceleration drive with care. Two days later it went away. The second occurrence, I was driving in the rain for approximately 22 miles and briefly parked with my vehicle running. I then turned out of a parking lot and began to accelerate to speed up and the check engine light came on along with all the same messages, this time my vehicle acceleration had seized and wouldn’t go faster than 30 MPH. I slowly drove back to the parking lot and turned the vehicle off to let it sit,...

I am writing to formally document serious engine defects I have experienced with my 2021 Chevrolet Tahoe equipped with the 5.3L L84 V8 engine. 1.Crankshaft Failure oMy Tahoe suffered a catastrophic crankshaft failure that required major repair/replacement. oI am aware that GM has recalled certain vehicles equipped with the 6.2L L87 engine for crankshaft and rod-bearing defects. oBased on my experience, the same or a very similar defect has also occurred in my 5.3L engine, which is currently not included in that recall. 2.Valve Lifter Failure oIn addition, my vehicle has suffered from valve lifter collapse—a well-documented problem in 2021–2022 GM trucks and SUVs with both the 5.3L and 6.2L engines. oThis caused severe misfiring, drivability issues, and expensive repair needs. Why this is a concern: •Both failures occurred well before what would be expected of a modern engine. •The crankshaft failure raises a safety risk: sudden loss of propulsion...

The affected components are the electrical system, engine, and power train. In March 2025, my 2021 Chevrolet Tahoe displayed multiple warning lamps across the dash, including traction control and check engine lights. The vehicle shifted erratically and sometimes entered limp mode. I brought the vehicle to AutoNation Chevrolet South Clearwater for inspection. The dealer replaced the battery, dismissed my concerns, and stated that a test drive was performed, but the mileage in and out on the invoice was identical, showing it never actually occurred. Diagnostic trouble codes (P0700, P0717, P2714, P2716, P0706, and multiple U-codes) were present but were not fully investigated. A GM Technical Service Bulletin (21-NA-149, December 2022) covers these exact symptoms (caused by engine wiring harness chafing), but it was never referenced or applied. Because the problem was not addressed, the condition worsened. By July 2025, the vehicle suffered a complete transmission failure. At that point, the...

The affected systems are the power train, engine, and electrical. My 2021 Chevrolet Tahoe experienced failures consistent with GM Technical Service Bulletin 21-NA-149 (engine wiring harness chafing) and the conditions outlined in Recall N232404190 (valve body failure, November 2024). Beginning in March 2025, the vehicle displayed warning lights and messages including Check Engine, Traction Control, Service Transmission, and limp mode (Reduced Acceleration – Drive with Care). The vehicle shifted erratically, lost power, and occasionally failed to accelerate, creating a serious safety hazard at highway speeds. These problems were documented at AutoNation Chevrolet South Clearwater, where multiple diagnostic trouble codes (P0700, P0717, P2714, P2716, P0706, and U-codes) were recorded but not properly investigated. No test drive was performed despite being claimed by the service technician, and the applicable TSB was not referenced. By July 2025, the condition worsened into a complete transmission failure, with additional codes (P0700, P077C, P17F6, P17FB, P1872)....

When driving the car just stops losing power then the car immediately shuts down and stops driving. I had to call a tow truck when it’s taken to the dealership the fuel pump power control module is faulty. This is a 2021 Tahoe they had to replace the fuel pump, power control module, and this vehicle should not have to be replaced. Chevrolet/GMC knows that these modules will make the vehicle stop wherever it is driving. I happen to be on a freeway going 70 mph and could have been killed. They have not put a recall out to have these modules replaced in any SUV. This is a danger for any driver on the road. This is a lawsuit waiting to happen for people. You know that they are aware this is happening because they paid for the tow and replaced this part that is not warranty now for...

To Whom It May Concern, I am writing to formally report serious defects with my 2021 Chevrolet Tahoe (VIN: [XXX] ) and to request assistance with repair costs. Approximately six months after purchase, when the vehicle had about 22,000 miles (I bought it used with around 19,000 miles), the battery and electrical system failed. I brought it to the dealer and was told there was no issue; they only performed a jump start. Two days later, the vehicle broke down in the middle of the road. I had to pay for a tow truck and replace the battery completely out of pocket. More recently, at about 92,000 miles, the vehicle developed severe engine problems. A certified mechanic diagnosed collapsed AFM lifters and camshaft damage. The repair requires OEM GM parts and costs approximately $4,500. This issue is widely reported by other GM owners with 5.3L AFM engines and is known...

Leaving the stoplight, all the sudden the dash read service ECM in the motor started clanking. Took it to the dealership where they told me the cam and lifters were bad and said we might as well get a new motor $17,000. And not approved by extended warranty, crooks.

Engine starting banging loudly and misfiring. There was a loss of power and engine codes. Brought to the dealer and they said cylinder #4 was misfiring due to a stuck lifter, bent push rod and destoyed cam. Total cost of repair was $9200. Vehicle is less than 4 years old an has 75,000 miles on it.

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while his wife was attempting to start the vehicle, the engine failed to turn over as intended. No warning light was illuminated. Upon further inspection, the contact stated that there was an abnormal sound coming from the vehicle. The contact used an OBD-2 diagnostic scanner and retrieved DTC: P129F and U18A2. The vehicle was towed to a local dealer, where it remained for further investigation. The contact related the failure to an unknown recall; however, the VIN was not under recall. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 82,000.

I am submitting this complaint regarding my 2021 Chevrolet Tahoe (VIN: [XXX] ) which has developed a severe transmission shudder at both low and highway speeds. The issue has been confirmed by my Chevrolet dealer, who provided an estimate of $5,492.18 for torque converter and valve body replacement. This failure is identical to the torque converter shudder problem documented in GM service bulletins and special coverage adjustments for other GM vehicles of the same make, model, and model year. However, my VIN is not currently included in those programs, leaving me without coverage despite experiencing the exact same defect. I believe this condition poses a serious safety risk, as the shudder occurs while driving at highway speeds, causing vibration, hesitation, and potential loss of control. These symptoms could lead to accidents if the vehicle fails to respond properly during acceleration or lane changes. Given that this appears to be a...

We are apart of the safety recall with the potential brake and engine issues, we have contacted the dealership and they have NO remedy at the current time for our defective vehicle. We contacted GM to request a buy-back due to the safety issues with the vehicle, told we did not qualify BUT they have no remedy for our defective truck. We do not fell safe in the vehicle, the brakes are sticking and the engine is making weird noises. We are currently seeking legal representation because we are being forced to drive around our family of 5 in an unsafe vehicle with NO remedy or option to trade it in.

Car stopped while in motion, engine shutdown and could not be put into neutral to move vehicle out of traffic. Car had to be towed away. Only 37 k miles. This is the Second time this has happened in traffic posing a major safety hazard. Fuel control module was what shut down the car while driving the first time. Now it has failed again

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving at approximately 40 MPH and accelerating to merge onto a highway, the check engine warning light started flashing. Additionally, the contact stated that there was an abnormal clunking sound coming from underneath the floorboard and coming from the engine compartment. The contact pulled over and stopped the vehicle. The vehicle was towed to the dealer, where it was diagnosed and determined that lifter #6 had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and informed the contact that it was a known failure, and the contact was offered monetary assistance. The contact was also referred to the NHTSA Hotline for assistance. The failure mileage was approximately 61,000.

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving on two occasions at various speeds, the vehicle stalled. There were no warning lights illuminated. The vehicle was not able to restart. The vehicle was towed a dealer where it was diagnosed that he fuel control module needed to be replaced. The vehicle was repaired, but the failure reoccurred approximately 10 months later. The manufacturer was not notified of the failure. The failure mileage was approximately 67,438.

Lifter failure and camshaft failure. Found metal in engine oil that has caused bearing failure and engine damage. While driving the Tahoe on [XXX] I experience a jolt on the front right side. Then warning messages regarding the Traction Control and to Service the ESC appeared. As I cleared those messages my engine light was blinking and several other dash lights were lit up. There was a knocking sound. I contacted the dealership (Coyle Chevrolet in Clarksville, IN) and they sent a tow truck to bring it in. They assumed it would be in the recall but it is not. I am without a vehicle and the engine is backordered. It's not right that GM is picking which engines they are going to include in the recall when they know there is a manufacturing issue. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

My 2021 Tahoe High Country began to make unrecognizable sounds and the orange engine light started blinking. I immediately pulled over and turned the vehicle off. I was made aware that numerous 2021-2024 V8 6.2L engines are affected. I am waiting for my VIN to be selected in some sort of lottery format to qualify for a fix. I was told by a Chevy Service Technician that it can take 2 weeks or 2 years for GM to find a “remedy”. Unacceptable and very expensive to rent a vehicle for work until GM decides to “remedy” my situation. I truly hope they provide me with a solution soon.

I was driving down I-635 (Dallas) at 70mph on Friday 7/25 when my Tahoe started shaking, knocking and had complete engine failure. I managed to regain control and slow to the service road. Thankfully the car next to me was paying attention & swerved to avoid me, but honked at me the entire time. The vehicle was towed and we are being told we need to replace the engine for $14,500. As I’ve researched, the 6.2L is recalled for this exact issue. The 5.3L has no current recall but I’m clearly experiencing the same engine failure and being told I’m responsible for it. I had no prior warnings & have regularly maintained this vehicle. Any chance others have complained about the 5.3L as well & our Tahoe’s should be included in this recall?

I’m reporting a transmission failure that occurred unexpectedly on my 2021 Chevy Tahoe/the diesel version has been recalled so I don’t know why all the other 2021 Tahoe have not been recalled for this issue . The vehicle began shifting roughly and slipping between gears, followed by a warning message and eventual inability to shift properly. I had it inspected by a family friend who owns a body shop , and I was told the transmission needs to be replaced at a cost of nearly $7,000. I am no longer under powertrain warranty, but this failure feels premature and unsafe for such a new vehicle. I’ve seen many other 2021 Tahoe owners report similar issues online including transmission failure, harsh shifting, valve body problems, and complete breakdowns . This seems like a pattern, and I believe it may warrant investigation. I’m asking NHTSA to investigate whether this is part of...

On 01/03/24, the vehicle stalled and smoked on the Suncoast Parkway. All dashboard warning lights and messages illuminated, and the vehicle entered emergency park mode. OnStar was contacted and the vehicle was towed to Jenkins Chevrolet in Homosassa, FL. The failure was linked to a broken pulley and belt system that damaged the ECM and wiring harness. No DTCs were pulled, and mileage in/out was 80042/80043—no test drive performed. On 08/06/24, the vehicle returned to Jenkins for a roaring noise. A pulley bearing was replaced, possibly related to the earlier failure. Again, no drivability evaluation or codes recorded. On 03/09/25, the same full system warning lights/messages appeared again. The vehicle experienced harsh shifting and delayed acceleration. It was taken to AutoNation Chevrolet South Clearwater on 03/10/25. DTCs (P0700, P0717, P2714, P2716, P0706, and U-codes) were found but dismissed. Only the battery was replaced. Mileage in/out was 99494—no test drive performed...

Automatic fuel management/ Displacement on demand caused lifter failure which caused cylinder failures.

I was driving home from a long trip and heard a large pop. Several warning signs and messages began popping up and the vehicle was shaking and struggling to maintain speed. I was able to get home and get my family out of the vehicle and get it to a dealer down the road. They stated the Fuel injector and harness had failed.