The contact owns a 2021 Toyota Tacoma. The contact stated while the vehicle was parked at the residence, the contact raised the hood to inspect the engine and became aware that the coolant bypass valve was leaking coolant. A dealer was not contacted. The vehicle was taken to a dealer to be diagnosed and the contact was informed that the coolant bypass valve needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and informed the contact that the part was not under warranty. The approximate failure mileage was 50,000.