P0879 Transmission Fluid Pressure Sensor Switch D Circuit Intermittent 2

Definition: The OBD-II code P0879 indicates that the Powertrain Control Module (PCM) has detected an intermittent issue with the transmission fluid pressure sensor/switch D circuit. This means there is an inconsistent signal from the sensor, which monitors the hydraulic pressure in the transmission.

p0879 – Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent 2

Typical Severity: Moderate

Common Causes

P0879 – Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent 2

Common Causes:

• Low transmission fluid level
• Dirty or contaminated transmission fluid
• Faulty transmission fluid pressure sensor/switch
• Wiring issues such as loose connections or shorts
• Faulty transmission control module (TCM)

Common Misdiagnosis

OBD2 Code: P0879

Description: Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent

Common Misdiagnosis: Replacing the transmission fluid pressure sensor/switch without checking for wiring issues or connector problems.

Common Diagnostic Steps

OBD2 Code: P0879

Description: Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent

• Check the transmission fluid level and condition. Ensure it is at the correct level and not contaminated.
• Inspect the wiring and connectors for damage, corrosion, or loose connections in the circuit related to the transmission fluid pressure sensor/switch D.
• Test the transmission fluid pressure sensor/switch D using a multimeter to ensure it is functioning within specifications.
• Examine the vehicle’s PCM (Powertrain Control Module) for any additional codes that may indicate other issues affecting this circuit.
• If necessary, replace the transmission fluid pressure sensor/switch D if found faulty after testing.
• Clear all codes and perform a test drive to see if the code returns, ensuring proper repair has been made.