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

Related Problems

Related Fault Codes