P0443 minor

Evaporative Emission Control System Purge Control Valve Circuit Malfunction

The P0443 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission Control System Purge Control Valve Circuit Malfunction. This is a minor severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: easy
Estimated cost: $20-$80 for purge solenoid

Try This First ($8 Fix)

Stant 10838 OE Fuel Cap

A cracked or loose gas cap causes 60%+ of EVAP codes. This $8 replacement clears P0442, P0455, and P0457 more often than any other repair.

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Find the Leak

THIKPO Automotive Smoke Machine

If a new gas cap does not clear it, the leak is somewhere in the EVAP plumbing. A smoke machine finds the exact leak -- a cracked hose, bad seal, or stuck vent valve -- in minutes instead of guessing at parts.

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Clear the Code

ANCEL AD310 OBD-II Scanner

Clear the code after the repair. If the light stays off after 50 miles, you just saved $200+ in shop fees.

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Common Symptoms

Check Engine Light on
Rough idle if purge valve is stuck open
Fuel odor from engine bay

Probable Causes (Ranked by Likelihood)

Failed EVAP purge solenoid (stuck open or closed) Very High
Open or shorted wiring to purge solenoid Moderate
Blown fuse for purge circuit Low

Step-by-Step Diagnostic Procedure

Test purge solenoid resistance: typical spec is 14-30 ohms. Out of range means replace the solenoid.
Command the solenoid open and closed with a scan tool. Listen for an audible click.
Inspect the wiring harness from the PCM to the solenoid for damage.
Check fuses for the EVAP/purge system circuit.

Common Fixes by Vehicle

What techs usually find when diagnosing P0443 on specific vehicles — tap your vehicle for the fix and the exact part:

2005-2015 Toyota Tacoma/4Runner 4.0L V6 Easy DIY

The EVAP purge valve solenoid circuit has high resistance from a corroded connector on the 1GR-FE engine. Unplug the purge valve and clean the terminals with electrical contact cleaner. If resistance through the solenoid is above 30 ohms, replace the purge valve.

Labor: 30-45 minutes

Common fix part Toyota EVAP Purge Valve Solenoid View on Amazon→ Compare fitment at PartsGeek→

2007-2017 Chevrolet Silverado 5.3L Easy DIY

The EVAP purge solenoid wiring harness rubs against the intake manifold, causing intermittent shorts. Inspect the wiring 6 inches back from the connector. Repair with weatherproof butt connectors and heat-shrink tubing. If the solenoid itself is bad, replace with ACDelco 214-2149.

Labor: 30 minutes - 1 hour

Common fix part ACDelco EVAP Purge Solenoid View on Amazon→ Compare fitment at PartsGeek→

2010-2018 Hyundai Santa Fe 2.4L Easy DIY

The purge solenoid connector on the 2.4L Theta II gets brittle from heat exposure and cracks, causing an open circuit. Inspect the connector for cracks or loose pins. If the connector is damaged, splice in a new pigtail connector rather than replacing the entire harness.

Labor: 30-45 minutes

Common fix part Hyundai EVAP Purge Solenoid View on Amazon→ Compare fitment at PartsGeek→

Frequently Asked Questions

Can a stuck-open purge valve cause a rough idle?

Yes. If the purge valve is stuck open, fuel vapors flow continuously into the intake at idle, creating an overly rich condition that causes rough or erratic idling, particularly on a cold start.