The contact owns a 2023 Chevrolet Tahoe. The contact received notification of NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING); however, the part to do the recall repairs were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue and confirmed that parts were not yet available. The contact stated that while driving at various speeds, the vehicle suddenly decelerated and briefly lost automotive power, before the vehicle regained normal functionality, with the check engine warning light illuminated. The vehicle was not repaired. The manufacturer was made aware of the issue. The approximate failure mileage was 60,000. VIN tool confirms parts not available.