Code Definition

P0444 — Evaporative Emission Control System Purge Control Valve Circuit Open

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

About P0444

P0444 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 P0444 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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 P0444 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 engine control module (ECM) sets this code when it detects an open circuit in the purge control valve circuit. The purge valve regulates fuel vapour flow from the EVAP canister to the intake manifold. If the ECM commands the valve to operate but does not detect the expected electrical response, it triggers this fault code.

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