P1623 – TCM EEPROM Error (Nissan)

Description

The ECM detected an EEPROM error in the transmission control module.

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Symptoms

  • Harsh shifting
  • Warning light

Causes

  • EEPROM damage
  • Programming error
  • TCM failure

Diagnosis

  • Scan TCM for codes
  • Check power supply
  • Verify programming

Repair

  • Reprogram TCM
  • Replace TCM