2026 Chevrolet Tahoe problems

“At approximately 4,200 miles, the engine on my 2026 Chevrolet Tahoe High Country equipped with the 6.2L V8 suddenly shut off while the vehicle was stopped at a traffic light. There were no warning lights, messages, unusual noises, or other symptoms prior to the failure. The vehicle would not restart and had to be towed to an authorized Chevrolet dealership. The dealership initially suspected a camshaft/lifter or related engine issue and performed diagnostic and mechanical testing. The dealer also opened a case with General Motors. GM subsequently directed the dealership to perform an ECM software update. After the update, the engine started and the vehicle appeared to operate normally. As part of the dealer's post-repair testing, a dealership employee drove the vehicle to confirm the issue was resolved. After approximately 7–10 miles, the vehicle suffered another engine failure while being driven and again became inoperable. The problem was therefore reproduced and confirmed by the Chevrolet dealership. Following the second failure, GM authorized replacement of the complete engine. The dealership has received a brand-new replacement engine and is replacing the…”

“While driving the vehicle at highway speeds the vehicle starts to lurch or randomly lose power. Eventually, within a few minutes, the lurching gets worse and the check engine light starts flashing. In a GM vehicle, a flashing check engine light is critical engine failure. After pulling the vehicle to the side of the road, the check engine light stops flashing and stays on constantly. After about 10-15 minutes, the check engine light turns off completely. The GM dealership can read the history and says it's P0300 error code for General Engine Misfire in cylinder #6. GM warranty refuses to fix anything because the light isn't on when the car comes into the dealership. The car has been to two different dealerships, with both of them telling me it has the same error code. GM customer service told me without the check engine light being on when the vehicle is brought into the dealership, they would not be able to help me. This is being told to me even though everyone agrees that the check engine light has been on. I was told by GM to continue to drive the vehicle. It has been into the shop 4 times since January for the same issue. This is not safe as the engine has…”

“I was on the interstate. Initially I heard a faint rattling sound. I turned off the radio and AC to listen more closely; the sound was not audible. But then traffic came to a standstill. As I slowed, that barely audible noise began to sound like something boiling in the engine. The temperature and pressure gages were all in normal operating ranges. I pulled to the shoulder of the interstate and checked under the hood. I noticed a distinctive squeaking sound although the fan belt was intacted in running true. There was no sign of any fluid loss in the engine compartment or underneath the vehicle. While attempting to get to a Chevrolet Dealership one exit away, the vehicle stopped running while at a stop light. additionally, there is a recall on this vehicle for the automatic braking system. GM and the dealerships are aware of this recall yet this website states there are no recalls.”

“The contact owns a 2026 Chevrolet Tahoe. The contact stated that while driving at an undisclosed speed, the engine seized. No warning lights were illuminated. The contact stated that while attempting to restart the vehicle, the vehicle failed to start. The vehicle was towed to the dealer, where it was diagnosed with engine and radiator failure. The contact was informed that the engine and the radiator needed to be replaced. The vehicle was not repaired. The contact was informed that the repair was under warranty, but the parts were unavailable. The contact stated that the failure had occurred three months after purchasing the vehicle. The manufacturer was made aware of the failure, and a case was filed. The failure mileage was approximately 3,900.”

“Vehicle accelerating on its own. It is not in cruise control mode. Accelerating without any pressure on the pedal. Engine revs when in park. Really jerky when coming to a stop”

“The contact owns a 2026 Chevrolet Tahoe. The contact stated that while his wife was driving 45 MPH, the brakes failed to engage while depressing the brake pedal. The contact's wife pulled into a parking lot, shut off the vehicle, and allowed the vehicle to coast in the parking lot until the vehicle came to a complete stop. Due to the failure, the vehicle was towed to a dealer but was not diagnosed or repaired. The failure mileage was 4,873.”