Hello I'm new to the world of diesel engine repair and i need some advice. Here are my codes. p01261 p0201 p0204 p0206 p0207 I havn't found any bad wires yet do i need to go ahead and pull the valve covers and check wires?

 

Found a corroded ground wire up by the hood. Replaced it and the codes are gone and it runs perfect.

 

Bad grounds can do some funny things. Glad to hear you found the probem