A vehicular electronic control apparatus includes a non-volatile memory, a storing portion, and a determination unit. The non-volatile memory is capable of storing a permanent diagnostic trouble code of a vehicle. The storing portion stores a real-time destination value indicating a currently set destination of the vehicle. The determination unit determines, based on the real-time destination value stored in the storing portion, whether the permanent diagnostic trouble code is a target permanent diagnostic trouble code to be stored in the non-volatile memory.