Load errors:
Warning CreateExport: Failed to load Outer for resource 'MovementComp': TP_VehiclePawn /Game/VehicleCPP/Maps/VehicleExampleMap.VehicleExampleMap:PersistentLevel.TP_VehiclePawn_9 Warning CreateExport: Failed to load Outer for resource 'Camera0': TP_VehiclePawn /Game/VehicleCPP/Maps/VehicleExampleMap.VehicleExampleMap:PersistentLevel.TP_VehiclePawn_9 Warning CreateExport: Failed to load Outer for resource 'InternalCamera': TP_VehiclePawn /Game/VehicleCPP/Maps/VehicleExampleMap.VehicleExampleMap:PersistentLevel.TP_VehiclePawn_9 Warning CreateExport: Failed to load Outer for resource 'InternalCameraBase': TP_VehiclePawn /Game/VehicleCPP/Maps/VehicleExampleMap.VehicleExampleMap:PersistentLevel.TP_VehiclePawn_9 Warning CreateExport: Failed to load Outer for resource 'VehicleMesh': TP_VehiclePawn /Game/VehicleCPP/Maps/VehicleExampleMap.VehicleExampleMap:PersistentLevel.TP_VehiclePawn_9 Warning CreateExport: Failed to load Outer for resource 'SpringArm0': TP_VehiclePawn /Game/VehicleCPP/Maps/VehicleExampleMap.VehicleExampleMap:PersistentLevel.TP_VehiclePawn_9 Warning CreateExport: Failed to load Outer for resource 'IncarGear': TP_VehiclePawn /Game/VehicleCPP/Maps/VehicleExampleMap.VehicleExampleMap:PersistentLevel.TP_VehiclePawn_9 Warning CreateExport: Failed to load Outer for resource 'IncarSpeed': TP_VehiclePawn /Game/VehicleCPP/Maps/VehicleExampleMap.VehicleExampleMap:PersistentLevel.TP_VehiclePawn_9
This does not affect the BP Vehicle or VehicleAdvanced feature pack.
Result: Load errors are shown and on PIE they are not defaulting to driving the car
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-40647 in the post.