Code Definition

P0879 — Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0879

P0879 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0879 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0879 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P0879 is recorded when the control module detects intermittent signals or erratic behaviour in the Transmission Fluid Pressure Sensor/Switch 'D' circuit. This intermittent condition suggests sporadic disruptions or inconsistencies in the signal transmission from the sensor/switch, which may not be continuous but occur at irregular intervals. Such intermittent issues can result in unpredictable transmission behaviour and can be challenging to diagnose due to their non-continuous nature.

Quick Facts