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FuelSeverity High: diagnose before driving on

P0231Fuel Pump Secondary Circuit Low

What it means

The voltage on the fuel pump supply side (after the relay) is too low when the pump should run.

Symptoms

  • No start or stalling
  • Pump not running

Common causes

  • Open pump supply wire or blown fuse
  • Relay contacts burnt
  • Pump seized or shorted

What to check first

  1. Measure the voltage at the pump connector while cranking
  2. Check the fuse and relay contacts
  3. Check pump current draw
Can I drive with P0231? Not recommended. P0231 can lead to stalling, limp mode or engine damage; diagnose it before driving further.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0231: questions and answers

What does P0231 mean?

P0231: Fuel Pump Secondary Circuit Low. The voltage on the fuel pump supply side (after the relay) is too low when the pump should run.

What are the symptoms of P0231?

No start or stalling. Pump not running.

What causes P0231?

Open pump supply wire or blown fuse. Relay contacts burnt. Pump seized or shorted.

How do you diagnose P0231?

1. Measure the voltage at the pump connector while cranking 2. Check the fuse and relay contacts 3. Check pump current draw

Can I drive with P0231?

Not recommended. P0231 can lead to stalling, limp mode or engine damage; diagnose it before driving further.