P0443: Evaporative Emission System Purge Control Valve Circuit
P0443 means Evaporative Emission System Purge Control Valve Circuit. The engine computer has found an electrical fault in the purge control valve (solenoid) circuit. The control module has detected a fault in the circuit itself, such as an open circuit, a short, or a signal outside the electrical limits it expects.
Can I keep driving? Safe to drive short-term, but have it checked to avoid failed emissions or worse fuel economy.
Common symptoms
- Check engine light on
- Usually no drivability change
- Possible hard starting after refuelling (purge valve stuck open)
Possible causes
- Failed purge or vent solenoid
- Wiring or connector fault
- Blown fuse
- Failed EVAP pressure sensor (sensor codes)
- Blocked canister vent (vent codes)
How to diagnose P0443
- Inspect the connector and wiring.
- Measure solenoid resistance and compare with specification.
- Command the solenoid on a scan tool and listen/feel for clicking.
- Check power supply and ground.
What the code means, digit by digit
Generic codes have the same definition on every OBD-II vehicle (petrol cars from model year 1996 in the US, 2001 in the EU; diesels later). Manufacturers can add their own enhanced codes; those are not listed here.
Related codes
- P0441 Evaporative Emission System Incorrect Purge Flow
- P0446 Evaporative Emission System Vent Control Circuit
- P0449 Evaporative Emission System Vent Valve/Solenoid Circuit
- P0451 Evaporative Emission System Pressure Sensor/Switch Range/Performance
- P0452 Evaporative Emission System Pressure Sensor/Switch Low
- P0453 Evaporative Emission System Pressure Sensor/Switch High
- P0496 Evaporative Emission System High Purge Flow
- P0497 Evaporative Emission System Low Purge Flow
General guidance only. Fault codes describe what the engine computer saw, not which part failed: confirm with testing before replacing parts, and follow the vehicle's service information.