P0445: OBD-II code P0445 flags a shorted circuit at the EVAP purge control valve — the PCM sees excessive current flow through the solenoid drive.

Symptoms

• Check engine light is on; may occasionally blow the fuse feeding the purge valve circuit.
• The purge valve may buzz continuously or fail to modulate, causing rough idle or a small vacuum leak.
• The vehicle will fail an OBD-II emissions test until the EVAP monitor completes and reports ready.

Common causes

• A failed purge valve with an internally shorted coil pulling too much current.
• A shorted-to-ground drive wire between the PCM and the purge valve.
• A short-to-battery-voltage on the drive wire, keeping the valve energised continuously.

What to do?

Disconnect the purge valve and measure its coil resistance (20-30 Ω normal; low resistance = shorted). Check the drive wire for continuity to ground and to B+ with the connector unplugged. Replace the valve or repair wiring.