P1221 – Fuel Pump Control Module Range/Performance (Nissan)

Description

The ECM detected a fuel pump control module signal outside the expected range.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Low fuel pressure

Causes

  • Faulty module
  • Weak fuel pump
  • Wiring issues

Diagnosis

  • Measure fuel pressure
  • Inspect wiring
  • Test module output

Repair

  • Replace module
  • Repair wiring
  • Replace pump