P0879

2017-10-10

Description:

  • The fault code P0879 indicates an intermittent issue in the circuit associated with the transmission fluid pressure sensor or switch 'D'. This code typically points to an intermittent electrical connection or wiring problem, leading to sporadic signal interruptions from the sensor or switch.

Possible Symptoms:

  • Intermittent Malfunction Indicator Lamp (MIL) or Check Engine Light illumination

  • Intermittent issues with transmission shifting, such as delayed or erratic shifting

  • Fluctuations in transmission behavior, such as sporadic slipping or harsh engagement

  • Inconsistent engagement or disengagement of certain gears

  • Occasional reduction in drivability or performance due to intermittent circuit interruptions

Possible Causes:

  • Intermittent connection or wiring issues in the transmission fluid pressure sensor/switch 'D' circuit

  • Loose or corroded connectors in the circuit

  • Faulty transmission fluid pressure sensor or switch 'D'

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

Related Parts:

  • Transmission Fluid Pressure Sensor: Gear fluid line delivers gear fluid/oil between the various gear parts that need lubrication. The Gear fluid line pressure Sensor monitors the fluid pressure in the line. Problems lead to difficulty in shifting gears

Possible Solutions:

  • Inspect and repair any intermittent connection or wiring issues in the circuit

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

  • Test and replace the faulty transmission fluid pressure sensor or switch 'D', if necessary

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

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