P1790 – TCM Fault (Nissan)

Description

The ECM detected an internal malfunction in the TCM.

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Symptoms

  • Harsh shifting
  • Limp mode

Causes

  • TCM failure
  • Overheating
  • Internal short

Diagnosis

  • Scan TCM data
  • Check power supply
  • Inspect wiring

Repair

  • Replace TCM