P0231High SeverityFuel System

Fuel Pump Secondary Circuit Low

What This Means

The fuel pump feedback circuit is reporting low voltage. This circuit monitors the fuel pump operation to verify it is running when commanded.

Common Symptoms

Hard starting
Engine stalling
Loss of power at high demand
Fuel pump noise

Common Causes

Failing fuel pump
Wiring resistance
Poor ground connection
Corroded connector
Relay issue

Estimated Repair Cost

$200 – $900

Parts and labor (varies by vehicle and location)

Difficulty:Moderate

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.