Fuel Pump Primary Circuit Malfunction or Error code P0230 can come up in Dead head and return type fuel systems. This also indicates that the fuel pump primary circuit is having a problem in Off/ON command. Sometimes, this code can also set when there is an incorrect voltage detected by the PCM in fuel circuit system.
What is a fuel pump ?
A fuel pump is an essential component on a modern car. Except for some vehicles with gravity fuel feed such as motorcycles and some carburetor vehicles having mechanical pump, almost all vehicles use a fuel pump. Any fuel injected engines use electric fuel pumps that are mounted inside the fuel tank (and some fuel injected engines have two fuel pumps: one low pressure/high volume supply pump in the tank and one high pressure/low volume pump on or near the engine). Fuel pressure needs to be within certain range for the engine to run correctly. If the fuel pressure is too high, the engine will run rough and rich. If the pressure is too low, the engine may run lean, misfire, or stall.