P0230 Fuel Pump Primary Circuit Malfunction

P0230 points to a fuel pump primary circuit malfunction. The fault path is the command or supply side of the fuel pump control circuit.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the fuel pump before checking the primary circuit; a relay, fuse, wiring, or control fault can prevent pump operation.

Symptoms of P0230

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0230

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Check fuel pump fuse, relay, control command, power feed, ground, inertia or cutoff switch if equipped, and connector condition.
Compare commanded pump operation with actual fuel pressure and voltage at the pump under load.
Inspect wiring near the tank, underbody, relay box, and module for corrosion, heat damage, or poor terminal contact.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.