P0865

2017-10-10

Description:

  • The fault code P0865 indicates a low voltage condition in the communication circuit between the transmission control module (TCM) and the vehicle's control system. This code typically points to an issue with the electrical circuitry or connection associated with the TCM, resulting in a low voltage signal.

Possible Symptoms:

  • Malfunction Indicator Lamp (MIL) or Check Engine Light illuminated

  • Issues with transmission shifting, such as delayed or erratic shifting

  • Inability to shift gears

  • Transmission stuck in a particular gear

  • Limited drivability due to the low voltage condition in the TCM communication circuit

Possible Causes:

  • Faulty transmission control module (TCM)

  • Wiring or connection problems in the TCM communication circuit

  • Loose or corroded connectors in the TCM system

  • Faulty engine control module (ECM) or other control modules

  • Intermittent low voltage condition in the TCM communication circuit

Related Parts:

  • Traction Control Module (TCM): Most modern vehicles are equipped with anti-lock brakes and traction control. Traction Control Module (TCM) is the part of the car computer that controls the electronic stability system (ESC) of the car. Problem leads to inefficient braking, ABS not working

Possible Solutions:

  • Test and replace the faulty transmission control module (TCM), if necessary

  • Inspect and repair the TCM communication circuit for any issues, such as damaged wires or connectors

  • Ensure the connectors in the TCM system are securely connected and free from corrosion

  • Test and replace the faulty engine control module (ECM) or other control modules, if necessary

  • Inspect for any intermittent low voltage conditions in the TCM communication circuit and repair as needed

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