Code Definition

P0799 — Pressure Control Solenoid C Intermittent

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

About P0799

P0799 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.

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 P0799 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 P0799 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control systems detects intermittent operation of the pressure control solenoid 'C'. This solenoid is essential for regulating the hydraulic pressure in the transmission, a key factor in controlling gear shifts. An intermittent issue indicates sporadic functionality of the solenoid, which can cause irregular transmission behaviour, such as unpredictable shifting patterns, intermittent shifting problems, or even temporary loss of pressure control during gear chan...

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