P1621 – ECM Memory Failure (Nissan)

Description

The ECM detected a malfunction in its internal memory.

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Symptoms

  • No start
  • Warning light

Causes

  • Memory corruption
  • Voltage spike
  • ECM failure

Diagnosis

  • Check ECM power
  • Inspect grounds
  • Scan ECM data

Repair

  • Replace ECM

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