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

Description

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

Need More Than Just the Fault Code?

A diagnostic scanner with live data, freeze-frame information and the right system access can help you investigate the actual cause before replacing parts.

Compare Diagnostic Scanners

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