What causes a P0231 code?

Common causes: Weak pump; Wiring resistance; Corroded pump connector.

What are the symptoms of a P0231 code?

Typical symptoms: No start; Hard starting.

No — this code can cause damage if you keep driving. Get it diagnosed before continuing. Estimated repair: $150-$700.

OBD-II Code · Fuel & Air

Fuel Pump Secondary Circuit Low

high severityDo not drive$150-$700

Fuel pump secondary circuit voltage low.

Common symptoms

Likely causes

Where to start

Try the cheapest cause first. Start by checking: weak pump.
Cost & scope. $150-$700
If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there. Don't keep driving with this one active — risk of damage.

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