P0443 — Evaporative Emission System Purge Control Valve Circuit
Low severityWhat it means
P0443 is stored when the engine control unit sees a fault involving the EVAP purge control valve circuit. The purge valve lets stored fuel vapours be drawn from the charcoal canister into the engine to be burned; the control unit switches it open and closed. The control unit has flagged this circuit or signal as outside its normal operating range.
Common symptoms
- Usually only a check engine light
- Rough idle if the valve sticks open
- A faint fuel smell in some cases
Likely causes
- A wiring, connector or ground problem in the circuit
- A failed sensor or actuator in the circuit
- A stuck or failed purge valve
- A wiring, connector or driver-circuit fault
What to check first
- Inspect the connector and wiring for damage, corrosion or loose pins
- Command the purge valve with a scan tool and listen for it click
- Inspect the valve connector and wiring
Can you keep driving?
Safe to drive; it is an emissions fault rather than a mechanical risk, but it will fail an emissions test.
Frequently asked questions
What is the most common cause of P0443?
The most likely cause is: A wiring, connector or ground problem in the circuit. Several other faults can set P0443 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0443 and keep driving?
Clearing P0443 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P0443?
P0443 is a low-severity code. It rarely affects how the car drives, but it is still worth fixing so the engine runs efficiently and passes an emissions test.
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