Staff Answer
Jul 20, 2026 - 06:30 PM
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The P0443 code indicates an electrical fault in the circuit controlling the EVAP purge valve, which manages fuel vapor emissions.
Method 1: Electrical Circuit Inspection Because this is a circuit code, start with the electrical supply.
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Inspect Wiring: Check the wiring harness connecting to the purge valve for broken wires, heat damage, or loose pins.
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Check Fuse & Relay: Locate your vehicle's under-hood fuse box. Identify and test the fuse/relay associated with the "EVAP" or "Powertrain Control Module (PCM)." If the fuse is blown, the valve cannot receive power.
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Clean Connectors: Use electrical contact cleaner on the plug to ensure a solid connection.
Method 2: Purge Valve Performance Test If the electrical circuit has power, the valve solenoid may have failed.
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Resistance Test: Unplug the valve and use a multimeter (ohms setting) to measure the terminals. A healthy valve typically shows 15–30 Ω. An "OL" or infinite reading confirms an internal open circuit, meaning the valve must be replaced.
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Vacuum Test: With the valve unpowered, try to blow air through it. A functional valve should be airtight. If air flows freely, the valve is stuck open and needs replacement.
Warning: Always disconnect the negative battery terminal before performing electrical repairs. Ensure you are working on the purge valve (usually near the intake manifold) and not the vent valve (near the fuel tank).
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