What Does P0443 Mean?
The PCM has detected a malfunction in the EVAP purge control valve circuit. This code indicates an electrical issue with the purge valve solenoid — the PCM commands the valve to open or close but the circuit response does not match expectations. This could be an open circuit, short circuit, or incorrect resistance. The driver may notice a slight fuel smell and the MIL will illuminate.
Common Causes
35%
Failed purge control valve solenoid (open or shorted coil)
25%
Damaged wiring or connector to the purge valve
15%
Corroded connector terminals causing intermittent contact
13%
Blown fuse in the purge valve power supply circuit
12%
PCM driver circuit failure for the purge valve output
Diagnostic Steps
1
Measure the purge valve solenoid coil resistance at the connector — typical values are 20–40 ohms. An open reading (OL) or near-zero reading indicates a failed solenoid.
2
Verify battery voltage is present at the purge valve connector with KOEO — one pin should have B+ (typically through a fuse). No voltage indicates a fuse, relay, or wiring issue.
3
Command the purge valve on and off via scan tool while monitoring the control circuit with a test light or current probe — verify the PCM is toggling the ground side.
4
Inspect the purge valve connector for corrosion, moisture, backed-out pins, or heat damage — these valves are often mounted on or near the intake manifold.
5
If the solenoid and wiring test good, check for a short to ground or short to power in the control wire between the PCM and the purge valve.
Estimated Repair Cost
$50 - $300
Parts + labor, varies by vehicle and location
The PCM has detected a malfunction in the EVAP purge control valve circuit. This code indicates an electrical issue with the purge valve solenoid — the PCM commands the valve to open or close but the circuit response does not match expectations. This could be an open circuit, short circuit, or incor...
The most common cause of P0443 (Evaporative Emission Control System Purge Control Valve circuit Malfunction) is: Failed purge control valve solenoid (open or shorted coil)
Typical repair costs for P0443 range from $50 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. A non-functional purge valve means fuel vapors are not being burned by the engine, which increases emissions. If the valve is stuck open, the engine may run slightly rich at idle. No significant safety concern.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0443 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emission (EVAP) System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
