P0443 - EVAP System Purge Control Valve A Circuit
P0443 is a generic powertrain diagnostic trouble code indicating EVAP System Purge Control Valve A Circuit. It relates to the Auxiliary Emission Controls system.
DTC Breakdown (SAE J2012)
| System | Powertrain (P) |
| Type | Generic |
| Subsystem | Auxiliary Emission Controls |
| Fault Index | 43 |
| Standard | SAE J2012 / ISO 15031-6 |
What does diagnostic code P0443 mean?
The engine control module logged P0443 after detecting an electrical circuit fault in the EVAP purge control valve solenoid circuit. The PCM monitors voltage drop across the valve; if it registers incorrect resistance, it sets this code.
Severity Level & Driveability Details
Severity: Low
Low. This is a minor emissions code that does not impact vehicle safety or mechanical performance, though the vehicle will fail local emissions testing.
Common Symptoms of P0443
- Check engine light illuminated on the dashboard.
- Slight decrease in fuel economy in some vehicles.
- No noticeable impact on engine performance.
Typical Causes for P0443
- Defective EVAP canister purge valve solenoid (internal electrical failure).
- Damaged, shorted, or corroded wiring in the purge valve harness.
- Loose, dirty, or corroded connector terminals at the purge valve.
- Failed Powertrain Control Module (PCM) in rare instances.
Diagnostic and Troubleshooting Steps
Disconnect the purge valve solenoid connector. Measure internal solenoid resistance using a multimeter (typically should read 20-30 ohms). If it shows an open circuit (OL) or short circuit, replace the solenoid. Verify 12V power supply and ground command from the PCM at the harness plug.
Typical Repairs and Fixes
- Replacing the EVAP canister purge valve solenoid.
- Repairing damaged wiring or connector pins in the purge valve circuit.
- Replacing the blown O2 sensor or underhood fuse powering the purge valve.
Sensor Location & Parts Involved
The EVAP purge valve solenoid is located under the hood, typically mounted on or near the intake manifold or firewall, inline with the vacuum line running from the fuel tank.
Clearing Code & Recurrence
Clear the code with a scan tool to reset the monitors and perform a verification drive.
Emissions & Smog Inspection Impact
Allows raw fuel vapors (hydrocarbons) to vent into the atmosphere, causing smog check failures.
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Related Diagnostic Codes
Sources & References
This diagnostic guide is compiled and verified against the following authority sources:
- EPA EVAP Standards
- CARB OBD II regulations
Frequently Asked Questions about P0443
What does the EVAP purge control valve circuit code P0443 mean?
The engine control module logged P0443 after detecting an electrical circuit fault in the EVAP purge control valve solenoid circuit. The PCM monitors voltage drop across the valve; if it registers incorrect resistance, it sets this code.
Is it safe to drive with the EVAP purge control valve circuit code P0443 active?
Yes, an EVAP fault poses no danger to vehicle function.
How much does it cost to repair a EVAP purge control valve circuit code P0443 fault?
Replacing the purge valve solenoid is straightforward. The part is $30-$80, and labor is $50-$100. Total cost is $80-$180.
What are the common causes of the EVAP purge control valve circuit code P0443?
Trigger conditions for the EVAP purge control valve circuit code P0443 include: Defective EVAP canister purge valve solenoid (internal electrical failure)., Damaged, shorted, or corroded wiring in the purge valve harness., Loose, dirty, or corroded connector terminals at the purge valve..
Can I clear the check engine light for EVAP purge control valve circuit code P0443?
Clear the code with a scan tool to reset the monitors and perform a verification drive.
Will the EVAP purge control valve circuit code P0443 cause an inspection failure?
Allows raw fuel vapors (hydrocarbons) to vent into the atmosphere, causing smog check failures.