Question 1

What does P0231 mean?

Accepted Answer

P0231 - Fuel Pump Secondary Circuit Low. Fuel pump circuit has low voltage — pump may not be receiving enough power.

Question 2

What are the symptoms of P0231?

Accepted Answer

Stalling, Hard starting, Loss of power under load, Possible no-start

Question 3

What causes P0231?

Accepted Answer

Bad fuel pump relay, Corroded wiring, Poor ground at pump, Failing fuel pump drawing too much current, Blown fuse

Question 4

How much does it cost to fix P0231?

Accepted Answer

Typical repair cost: $50-$800. Check fuel pump relay and fuse first. Corroded wiring at the fuel pump connector (at the tank) is very common, especially on trucks.

P0231 — Fuel Pump Secondary Circuit Low

Don't guess — diagnose P0231 the right way

Common symptoms of P0231

Common causes of P0231

Repair cost & difficulty

Vehicles commonly affected

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