The contact owns a 2017 BMW X4. The contact received notification of NHTSA Campaign Number: 24V608000 (Engine and Engine Cooling, Electrical System); 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 manufacturer was not made aware of the issue. The contact stated that while slowing down for a traffic light, the message for possible transmission failure and to seek service immediately was displayed. The contact had taken the vehicle to a dealer, but the vehicle was not diagnosed or repaired. The contact stated that the failure was intermittent. The contact related the failure to NHTSA Campaign Number: 24V608000 (Engine and Engine Cooling, Electrical System). The failure mileage was approximately 100,000. VIN tool confirms parts not available.