Staff Answer
Jul 20, 2026 - 06:35 PM
-
The P0443 code indicates an electrical malfunction in the circuit controlling the EVAP purge valve, which prevents fuel vapors from escaping into the atmosphere.
Method 1: Electrical Circuit Inspection Since this is a circuit-specific code, power delivery is the most common failure point.
-
Inspect Wiring: Examine the wiring harness connected to the purge valve for signs of fraying, rodent damage, or heat-related melting.
-
Check Fuses: Locate the engine bay fuse box and inspect the fuse associated with the "EVAP," "Emission," or "PCM." A blown fuse cuts off power to the valve solenoid.
-
Clean Connectors: Remove the harness connector from the purge valve. Check for green or white corrosion on the pins. Clean with electrical contact cleaner and ensure a snug fit upon reconnection.
Method 2: Solenoid Resistance & Function Test If the circuit has power, the internal coil of the valve may be dead.
-
Resistance Test: Disconnect the purge valve. Use a multimeter set to ohms (Ω) to test across the two terminals on the valve. A standard reading is typically 15–30 Ω. An "OL" or infinite reading indicates an open circuit, meaning the valve must be replaced.
-
Click Test: Use jumper wires to apply 12V directly to the valve terminals. A functioning valve should produce a distinct "click" as the solenoid actuates. If there is no sound, the valve is faulty.
Warning: Always disconnect the negative battery terminal before performing electrical repairs. Never apply 12V power to the vehicle’s wiring harness side; only test the valve solenoid itself.
Watch My Tutorial
Add New Comment