Fuel Pump Secondary Circuit Intermittent

Where it lives

For P0233, the circuit described runs through the pump. The description of P0233 reports a fault at the pump.

Check these first

• A loose fuel pump connector
• Chafed wiring on the fuel pump secondary circuit
• A failing fuel pump
• A weak fuel pump relay
• A poor fuel pump ground

What to do next

1. Wiggle test the fuel pump harness on live data
2. Inspect the secondary circuit wiring for chafing
3. Check the fuel pump relay and ground
4. Monitor the fuel pump current draw for dropouts
5. Replace the fuel pump if the current spikes or drops
6. Clear the code and retest

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