2021 Chevrolet Tahoe: check engine light

Filed Oct 27, 2026 · Fuel system · TN

While driving down interstate at approx. 55-65mph, vehicle "sputtered" and shut off while driving. Vehicle would crank but not start. After sitting approx. 10 mins, was able to restart and drive approx. one mile or less before "sputter" and vehicle died, followed by another crank no start. No check engine lights came on. Vehicle was in roadway in very dangerous location with blind curve requiring Police to be called in fear of my safety, since vehicle was in roadway, I was afraid for my children's safety as there were in car seats in the vehicle at time of failure. I was also concerned about my safety as well as other motorists safety. I was scared that I was going to get hit by another vehicle since my vehicle died in the roadway in a curve. There was an increased probability of injury or death from the faulty part on this vehicle. Police were on scene to assist with traffic, however no report was made, vehicle was disabled. Vehicle had to be towed to residence. CEL came on after approx 3rd start attempt. Believe issue to be Electronic Fuel Control Module which is common with this vehicle year/make/model. However in contacting the dealer in which I purchased Tahoe, they state that this particular VIN has no open recalls, however it matches description on recall N252516900 Fuel Pump Power Control Module. Vehicle is not yet repaired, it has not been inspected, and faulty part is still on the vehicle, vehicle and part are available for inspection.

Filed Oct 13, 2026 · Transmission · TX

My car on the dash board said do not accelerate and was shaking and the gear would not go into reverse. When I tried the car would not move. I towed the car to local Chevy dealer and when I told them about N242454441 or related safety campaigns like N242454440 nothing came up for my VIN but was informed GM had this program specifically for my code ( check engine light on) reading P0776 and P0700. This was not covered.

Filed Sep 23, 2026 · Transmission · 76,000 miles · CO

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving at various speeds uphill, the vehicle made a loud clunking sound while downshifting. While driving 70 MPH on one occasion, and while driving 20 MPH on another occasion, the vehicle made a loud clunking sound while downshifting and lost motive power, prompting the driver to pull over to the side of the road. The message "Reduced Acceleration - Drive with Care" was displayed, and the check engine warning light illuminated following the failure. The vehicle was restarted but the warning light remained illuminated. The vehicle was taken to a local dealer, where it was diagnosed and determined that the transmission control valve body and a separator plate or spacer needed to be replaced. The contact associated the failure with TSB: 22-NA-258; however, the VIN was not included. The vehicle was being repaired. The manufacturer was notified of the failure by phone and offered partial financial assistance. The failure mileage was approximately 76,000.

Filed Sep 23, 2026 · Engine · WA

The vehicle suffered complete internal engine failure due to a snapped timing chain on startup. The vehicle turned over via the starter motor but failed to start. A professional diagnosis confirmed the broken timing chain caused extensive valve-to-piston damage, requiring a full engine replacement. This failure appears to be a direct consequence of the known 6.2L L87 V8 engine crankshaft and connecting rod manufacturing defects. Severe mechanical resistance or violent rotational harmonics at the crankshaft level place un-engineered stress on the timing drive system, causing the chain to snap under startup torque. All broken components are preserved and available for inspection. The defect creates a severe risk of sudden, total loss of propulsion while driving. Had the compromised timing chain snapped at highway speeds rather than on startup, it would cause immediate engine seizure, a sudden loss of power steering, and a loss of power brake vacuum assist. This leaves the driver unable to accelerate or safely steer out of active traffic, creating an extreme risk of a high-speed crash.The broken timing chain and total engine destruction were officially diagnosed and confirmed by professional automotive repair technicians.The damaged components have been inspected by independent repair representatives. The vehicle has not yet been inspected by General Motors because this specific VIN is excluded from the current recall scope. There were no warning lamps, check engine lights, or diagnostic trouble codes (DTCs) prior to parking the vehicle, and no outward symptoms of severe engine stress were present until the complete no-start failure.

Filed Sep 20, 2026 · Transmission · TN

On September 19, 2026, while traveling approximately 30 mph, the vehicle experienced a sudden, hard shift. The check-engine light then illuminated. I pulled over as soon as it was safe to do so. After stopping, the vehicle would not shift into reverse and entered limp mode. The transmission malfunction created a safety risk because the vehicle’s operation and available gears became restricted unexpectedly while it was being driven. The loss of reverse also prevented the vehicle from being maneuvered normally. The vehicle was not driven after the incident and was towed from the location. The vehicle and affected components are available for inspection upon request. At this time, the vehicle is awaiting inspection and diagnosis to determine the exact cause of the transmission malfunction.

Filed Sep 1, 2026 · Brakes, Driver assistance · 118,000 miles · MO

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving approximately 70 MPH, the message "Service ESC" was displayed, and the check engine, traction control, and Forward Collision Avoidance warning lights were illuminated. The vehicle started shaking and then lost power. The vehicle was pulled over to the side of the road, parked, and then turned off. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 118,000.

Filed Aug 28, 2026 · Engine · CA

Engine ceased to run. Two rods bent. No power. All engine lights on. Good oil pressure and oil level. Tahoe towed back to Simi Valley Chevrolet for engine replacement.

Filed Aug 28, 2026 · Engine, Transmission · ID

My vehicle had a pop and loss of power on the highway. After pulling over, I did not have a check engine light but did connect my code reader and found a P308. I felt unsafe to drive so I had it towed to a shop. I later found out the DOD system or lifter on valve #8 has failed and needs replacement. Factory recommends oil change at every 7k miles, I did them at 4K. My oil pressure was up to par with the small window of real time allowable oil pressure. The design was great on paper but one of the worst engines GM has ever made. I sincerely hope there is enough people complaining about these 2021 GM 6.2 & 5.3 engines!!

Filed Aug 22, 2026 · Engine · SC

6.2L engine failure. Camshaft and lifters. My [XXX] wife ([XXX]) was driving and it shut off going down the highway. It is at my local Chevrolet dealer getting repaired. No warnings. No engine light. Vehicle has 88,000 miles on it, I purchased it April 22, 2026 with 84,700 miles on it. My Chevrolet App says there are no issues with the vehicle..it’s in pieces at the dealership. I had higher standards for a high country. Always owned Chevrolets. May be my last one. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 2, 2026 · Airbags, Steering · MI

-On the date of Monday XXX at approximately 4:30 pm est I was traveling on [XXX] and transmission felt like a possible slip happened in transmission. At approximatively 4:45pm est I made it home tried to back vehicle into parking space and reverse was lost. Vehicle didn't and wouldn't shift into reverse. I had to push vehicle in spot backwards. No check engine or warning lights were displayed on dash. - On Tuesday XXX. I contacted [XXX] of [XXX] approximately at 8:30 am est. [XXX] answered. I explained the symptoms and asked If I could bring in within the hour or so. He stated it would be fine to bring in. - At approximately 9:10 am est My girlfriend and [XXX] daughter got in vehicle. Started vehicle no service lights were on, but had no reverse still no reverse. My girlfriends mother was following us to pick us up at dealership as we dont have a 2nd vehicle. We started out driveway to [XXX]. I had no problems at 1st then prior to the intersection of [XXX] the Vehicle lost control on its own. The sequences happened fast and abrupt. 1. Vehicle downshifted roughly to about 3 gear 2. Lost power steering 3. engine over revved 4. vehicle pulled right. During this time as a professional trained driver. I removed us off [XXX] off road way on to [XXX] (To the right) to avoid being in an accident. I would say that the speed was roughly 20MPH at turn as I was avoiding the accident that could of potentially happened. I was not on asphalt the whole time to make turn as I had a limited vehicle (Not properly functional). I was able to stop at [XXX] to stop. Stopped on Brigantine is when I pointed out to my girlfriend that the lights just came on. in the meantime, we received a phone call from [XXX] (Girlfriends mom) asking where we went as she didn't see us. We explained to her situation, and she met on Brigantine and followed us to dealership. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jul 26, 2026 · Engine, Fuel system · SC

The engine in my 2021 Chevrolet Tahoe High Country equipped with the 6.2L V8 (L87) experienced a catastrophic failure. While driving, the vehicle suddenly lost power, displayed a “Service ESC” warning, illuminated the check engine light, and unexpectedly shifted into Neutral. After stopping the vehicle, it would not restart. The dashboard would illuminate, but the engine would only produce a faint clicking sound and would not crank. The vehicle was towed to a Chevrolet dealership, where it remains available for inspection. How was your safety or the safety of others put at risk? This failure occurred while I was driving, causing an unexpected loss of power and propulsion. The vehicle became disabled without warning, creating a significant risk of being struck by surrounding traffic. Losing the ability to accelerate or safely maneuver a full-size SUV in traffic placed both me and other motorists at risk of a serious crash. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. The vehicle was towed to an authorized Chevrolet dealership, Crews Chevrolet. The dealership confirmed that the engine had catastrophically failed and advised that it qualified for replacement under General Motors’ special coverage program for the 6.2L L87 engine. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Yes. The vehicle has been inspected by an authorized Chevrolet dealership. General Motors has authorized replacement of the engine under its special coverage program. No police report was filed because there was no collision.

Filed Jun 30, 2026 · Engine, Fuel system · IN

The engine's Dynamic Fuel Management (DFM) lifter failed and damaged the camshaft at around 70,700 miles. The broken components are available for inspection upon request. This failure put occupants at risk because the vehicle suddenly lost power, began shaking violently, and could not accelerate safely in traffic. This unexpected loss of propulsion created an immediate collision hazard. The problem was officially diagnosed and confirmed by a repair service center. It has not been inspected by police or insurance representatives. There were no advance warning signs. At the exact moment of the failure, the check engine light started flashing, the car began shaking heavily, and the engine made a loud knocking sound.