P0233 Code - Fuel Pump Secondary Circuit Intermittent

What Does P0233 Mean?

OBD-II Code Decreased engine performance is defined as a Fuel Pump Secondary Circuit Intermittent

The Fuel Pump enables the transfer of fuel from the fuel tank to the fuel injectors in the engine. The Fuel Pump is controlled by the engine computer (PCM) or the Fuel Pump Control Module (most newer vehicles). When the Ignition is turned on, the PCM or Fuel Pump Control Module will activate the fuel pump. If the PCM detects an incorrect signal to or from the fuel pump, it will set code P0233.

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What are the common causes of P0233 ?

• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
• Faulty IMRC actuator relay (if equipped)
• Defective ECU strategies or components will prevent proper regeneration

How do you troubleshoot P0233 ?

• Replacing the fuel pump relay if it is making intermittent connection on the secondary side of the relay
• Replacing the IFS or relay if it shows signs of corrosion inside the connections, and cleaning or replacing the connector of all corrosion
• Repairing a low battery voltage condition by replacing the battery, or repairing and cleaning the connections

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