P0231 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0231 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0231 code.

What Does P0231 Code Mean?

OBD-II Code P0231 is defined as a Fuel Pump Secondary Circuit Low

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 P0231.

P0231 Symptoms

• Decreased engine performance
• Engine may not start

Common Problems That Trigger the P0231 Code

• Fuel pump failure
• Fuel pump relay failure
• Powertrain Control Module (PCM) failure
• Wiring issue

Common Repairs Needed for the P0231 Code

• Fuel Pump Replacement