P0233 – Fuel Pump Secondary Circuit Intermittent

Description

The ECM detects intermittent voltage or signal loss in the fuel pump secondary circuit.

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Symptoms

Engine stalls
Hard starting
No start condition
Loss of power

Causes

Loose or corroded wiring
Failing fuel pump relay
Faulty fuel pump
PCM/ECM driver fault

Diagnosis

Check fuel pump relay
Inspect wiring and connectors
Test fuel pump voltage
Scan for related fuel system codes

Repair

Replace fuel pump relay
Repair wiring
Replace fuel pump
Replace PCM/ECM if needed