P1865 – TCM Communication Line (Nissan)

Description

The ECM detected a malfunction in the TCM communication line.

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Symptoms

  • Harsh shifting
  • Warning light

Causes

  • CAN fault
  • Wiring issue
  • TCM error

Diagnosis

  • Check CAN wiring
  • Inspect connectors
  • Scan TCM data

Repair

  • Repair wiring
  • Replace TCM