What does P0443 mean?

The ECU found an electrical fault in the EVAP purge valve circuit.

How do I test the purge valve?

Check coil resistance, then command it with a scan tool and make sure it clicks and opens.

Evaporative emission (EVAP)

P0443 — Evaporative Emission System Purge Control Valve Circuit

The ECU detected an electrical fault in the EVAP purge control valve circuit, such as an open or short in the valve or its wiring. The system cannot manage fuel vapour correctly.

Severity: Low

Common causes

Faulty purge control valve (solenoid)
Damaged wiring or loose connector
Blown fuse or power supply fault
Engine control module driver fault (rare)
Corrosion in the connector

Symptoms

Check engine light
Possible rough idle or hard starting after refuelling
Failed emissions test
Often no other symptom

How to check

Check the purge valve connector and wiring
Measure the solenoid resistance and supply voltage
Command the valve with a scan tool and listen for a click
Replace the valve if its coil is open or shorted

Can you keep driving?

Usually safe to drive. Repair it at a convenient time.

Frequently asked questions

What does P0443 mean?: The ECU found an electrical fault in the EVAP purge valve circuit.
How do I test the purge valve?: Check coil resistance, then command it with a scan tool and make sure it clicks and opens.

General reference information. It does not replace a diagnosis on your own vehicle. The same code can have different causes depending on make, model year and engine; check the manufacturer's documentation or ask a technician with a scan tool.