P0865 Code - TCM Communication Circuit Low

Discussion in 'P - Powetrain Codes' started by fault code, Mar 28, 2018.

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    fault code Administrator Staff Member

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    What does P0865 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.

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    What are the common causes of P0865 ?

    The P0865 trouble code is almost always the result of a faulty traction control ON/OFF switch, which usually occurs due to liquid spills on the switch in the vehicle’s interior. It is also possible that the issue is the result of damaged electrical components in the system, such as shorted wires, corroded connectors, or blown fuses.

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    How do you troubleshoot P0865 ?

    The valves of each cylinder are kept closed using a pair of arms that replace the conventional engine's roller-type rocker arm. P0865 code one of these arms follows the cam profile while the second arm connects to the valves. During normal engine operation the two arms are joined by a locking pin.

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