i pulled two codes today the first was p0380 with is the glow plug heater no bigge but the one i am confused about is p1345 whick is the Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation which im guessing means i need to replace the crank and cam sensors but idk this is my first diesel and need a little advice on if you think i am correct with that guess or if it something else and how i would go about fixing it