EVAP Emission Control System -- Vacuum System (Ford) / EVAP Control System Purge Flow Malfunction (Nissan)
What does P1443 mean?
The P1443 code means the vehicle's onboard diagnostic system has detected: EVAP Emission Control System -- Vacuum System (Ford) / EVAP Control System Purge Flow Malfunction (Nissan). This is a low severity code.
Common Symptoms
- Check Engine Light on
- Failed emissions test
- Fuel smell near the vehicle
- Slight rough idle when cold
- No noticeable drivability issues
Probable Causes (Ranked by Likelihood)
- Failed EVAP purge solenoid valve Very High
- Leaking EVAP hose or connection High
- Cracked or damaged charcoal canister Moderate
- EVAP canister vent valve malfunction Moderate
- Vacuum line leak in EVAP system Low
Step-by-Step Diagnostic Procedure
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Test the EVAP purge solenoid -- it should click when activated and hold vacuum
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Perform a smoke test on the EVAP system to find leaks
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Inspect all EVAP hoses and connections for cracks or loose fittings
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Check the charcoal canister for damage or saturation
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Test the EVAP canister vent valve for proper operation
Frequently Asked Questions
Can I drive with code P1443?
Yes. The EVAP system controls fuel vapor emissions and does not affect engine performance. You will likely fail an emissions test until the issue is resolved.
What causes P1443?
A failed EVAP purge solenoid is the most common cause. This valve controls the flow of fuel vapors from the charcoal canister to the engine. When it fails, the system cannot properly manage fuel vapor emissions.
Is P1443 expensive to fix?
Usually not. The purge solenoid typically costs $30 to $80 for the part. EVAP hoses are also inexpensive. A damaged charcoal canister is more expensive at $150 to $300.