What Does P0865 Code Mean?

OBD-II Code P0865 is defined as a TCM Communication Circuit Low

If the Transmission Control Module (TCM) cannot communicate with other modules or the engine control module (PCM) can not communicate with the PCM, code P0865 will be set.

P0865 Symptoms

  • Increased fuel consumption
  • Transmission may not shift properly

Common Problems That Trigger the P0865 Code

  • Transmission Control Module (TCM) failure
  • Wiring issue
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