The contact owns a 2022 Chevrolet Suburban. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated that there was a knocking sound coming from the engine while remotely starting the vehicle. The dealer was contacted and confirmed that there was no part for the repair. The manufacturer was made aware of the issue. The failure mileage was approximately 15,000. VIN tool confirms parts not available.