Code Definition

P0779 — Shift Solenoid B circuit Intermittent malfunction

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

About P0779

P0779 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 P0779 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 P0779 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 P0779 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control systems detects intermittent electrical issues in the circuit of pressure control solenoid 'B'. This solenoid plays a critical role in managing the hydraulic pressure within the transmission, essential for smooth gear shifts. An intermittent malfunction suggests that the solenoid's electrical circuit is experiencing sporadic connectivity or performance issues. This can lead to irregular transmission behaviour, such as unpredictable shifting patterns, int...

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