Failed EVAP canister purge control valve solenoid (open or shorted coil); Damaged, disconnected, or corroded electrical connector at the purge solenoid; Broken or chafed wiring in the purge solenoid circuit between the ECM and the valve; Stuck-open or stuck-closed purge valve due to carbon buildup or debris; Faulty engine control module driver for the purge solenoid circuit (rare); Vacuum hose leak or blockage between the purge valve and the intake manifold; Evaporative emission system pressure sensor fault misreporting purge flow

DTC codes / Nissan codes / P1493

P1493 · NissanEVAP Canister Purge Control Valve Solenoid Valve

Q: What does code P1493 mean?

EVAP Canister Purge Control Valve Solenoid Valve. P1493 on Nissan vehicles indicates that the engine control module has detected an electrical fault in the EVAP canister purge control valve solenoid circuit, which is responsible for metering fuel vapor from the charcoal canister into the intake manifold. The computer monitors the solenoid's current draw and response time, and it sets this code when the circuit is open, shorted, or the valve fails to respond as expected.

P1493 on Nissan vehicles indicates that the engine control module has detected an electrical fault in the EVAP canister purge control valve solenoid circuit, which is responsible for metering fuel vapor from the charcoal canister into the intake manifold. The computer monitors the solenoid's current draw and response time, and it sets this code when the circuit is open, shorted, or the valve fails to respond as expected.

SystemPowertrain

Code typeNissan specific

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
A faint fuel or gasoline odor around the vehicle, especially after refueling
Slightly rough idle or occasional stumble when the purge valve is commanded open
Difficulty refueling or a fuel nozzle that clicks off repeatedly due to tank pressure issues
In rare cases, a slight hesitation during light acceleration if the valve sticks open
Often no symptoms besides the warning light

Common causes, most likely first

Failed EVAP canister purge control valve solenoid (open or shorted coil)
Damaged, disconnected, or corroded electrical connector at the purge solenoid
Broken or chafed wiring in the purge solenoid circuit between the ECM and the valve
Stuck-open or stuck-closed purge valve due to carbon buildup or debris
Faulty engine control module driver for the purge solenoid circuit (rare)
Vacuum hose leak or blockage between the purge valve and the intake manifold
Evaporative emission system pressure sensor fault misreporting purge flow

How to diagnose and fix it

Verify the code with a scan tool and check for any related EVAP or misfire codes before proceeding
Inspect the purge solenoid electrical connector and wiring for corrosion, looseness, or damage
Measure the resistance of the purge solenoid coil with a multimeter and compare to specification
Command the purge solenoid on and off with a scan tool and listen for a distinct click from the valve
Check for vacuum leaks or blockages in the hoses connecting the purge valve to the canister and intake
If electrical and mechanical checks pass, test the control circuit from the ECM to the solenoid for continuity and shorts
Replace the purge control valve solenoid if it fails resistance or functional testing, then clear the code and verify repair

Before you replace the purge solenoid

A stuck-open purge valve can cause a rough idle or stalling at stops because it allows unmetered fuel vapor into the intake, which is often misdiagnosed as a vacuum leak or fuel injector issue.
The purge solenoid is frequently damaged by debris or carbon from the charcoal canister, so replacing the valve without checking for canister deterioration can lead to a repeat failure.
A loose or corroded ground connection at the purge solenoid mounting point can mimic a failed solenoid, so always check grounds before condemning the part.
Some Nissan models use a purge valve that is normally closed; if it fails open, the engine may run rich and set fuel trim codes alongside P1493, so check fuel trims during diagnosis.
The ECM driver for the purge solenoid can be damaged by a shorted solenoid coil, so always test the coil resistance before installing a new ECM to avoid repeating the failure.

Can I keep driving with P1493?

You can generally continue driving with P1493 because it rarely affects engine performance or safety, but avoid topping off the fuel tank excessively and have the fault repaired soon to prevent EVAP system pressure issues or a failed emissions test.

Tools that help

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Guidance is general and written for Nissan vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.