For you have been experiencing this problem, DO NOT DROWN THE CAR it will make it un-drivable and to fix this you must summon the car to oilfields in the most North region of the map and then call it, then travel to the most South of the map which is regional airport, and call it back, it may come back broken if this happens fast travel to the aldecaldos camp, keep running away from the camp until it lets you spawn the car, if it says your car is around 2,000 metres away you are doing it right, then go to the nearest road and summon the car again, if it still comes back broken you should repeat this process until it is fixed. This may take a while it took me about 5 tries to get it right.