P1624 – MIL Request Signal from TCM (Nissan)

Description

The ECM received a malfunction indicator request signal from the TCM.

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Symptoms

  • Warning light
  • Harsh shifting

Causes

  • Internal TCM fault
  • Sensor issue
  • Hydraulic problem

Diagnosis

  • Scan TCM data
  • Check transmission sensors
  • Inspect wiring

Repair

  • Repair transmission fault
  • Replace TCM