P1443
EVAP Canister Purge Volume Control Valve
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The P1443 code on Nissan vehicles indicates a problem with the EVAP canister purge volume control valve or the purge flow monitoring system. The EVAP system captures fuel vapors from the gas tank in a charcoal canister and periodically purges them into the engine to be burned during combustion. This code is set when the ECM detects that the purge flow is not occurring as expected.
This is a low-severity emissions code — your vehicle will continue to drive normally in almost all cases. The most you might notice is a faint gasoline odor near the vehicle, particularly after fueling. The primary concern is that your vehicle will fail an emissions test and the check engine light will remain on.
The most common fix is replacing the purge volume control valve, which is typically located on or near the intake manifold. These valves cost $25–$80 and are relatively easy to access on most Nissan engines. Before replacing the valve, inspect all the EVAP vacuum lines and hoses for cracks or disconnections — a simple hose fix can save you the cost of a new valve. If the charcoal canister itself is saturated (common on vehicles driven frequently on very short trips), it will also need replacement.
Severity
Symptoms
- •Check engine light is on
- •Faint fuel odor near the vehicle
- •Vehicle may fail emissions testing
- •No significant drivability symptoms
- •Fuel economy may be slightly reduced
- •Gas cap area may have a hissing sound when opened
Likely Causes
The EVAP canister purge volume control valve is stuck open or closed, or has an internal leak preventing proper vapor flow from the charcoal canister to the engine intake.
Vacuum lines and vapor hoses in the EVAP system have become brittle, cracked, or disconnected, allowing vapors to escape or air to enter the system.
The charcoal canister is saturated or damaged, unable to properly store fuel vapors, which disrupts the purge flow cycle.
The sensor that monitors purge flow is providing incorrect readings, or the wiring to the purge valve solenoid has a fault preventing proper operation.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the EVAP canister purge volume control valve
- Inspect and replace cracked or disconnected EVAP hoses
- Replace the charcoal canister if saturated
- Check wiring and connectors to the purge valve solenoid