P0443: Evaporative Emission System Purge Control Valve Circuit
The engine computer has found an electrical problem with the EVAP purge valve or its wiring.
What P0443 means
The purge valve is an electrically controlled solenoid that opens to let engine vacuum pull stored fuel vapor from the charcoal canister into the intake. The engine computer switches it on and off and watches the circuit. RepairPal explains that P0443 means improper purge operation caused by a malfunctioning purge valve or a shorted or open valve circuit. So this code points first to the valve coil, the wiring and the connector. A blown fuse can also cut power to the valve. If the valve is stuck closed, vapors are not purged and you may smell fuel. If it is stuck open, vapor floods the intake at idle and can cause rough running, especially after a fill up. Shops measure the valve resistance, check for power and the control signal from the computer with the key on, and command the valve with a scan tool while listening for a click. A new valve or a wiring fix usually clears the code.
Common symptoms
- Check engine light on
- Usually no driveability change
- Fuel odor in some cases
- Rough idle if the valve is stuck open
- Other EVAP codes may follow
Most common causes
- Failed purge valve solenoid coil
- Open or shorted wire to the purge valve
- Corroded or loose connector
- Blown fuse for the purge circuit
- Engine computer driver fault (rare)
What to check yourself first
Find the purge valve and check the connector for corrosion or a broken latch. Measure the solenoid resistance with a meter; an open or very low reading means a bad valve. Check the fuse that feeds it.
Typical fixes and what they cost
| Fix | Typical cost | Note |
|---|---|---|
| Replace EVAP purge valve | $210-$251 | RepairPal notes P0443 often comes from a physically bad purge valve or an open or shorted circuit. |
| Electrical diagnosis to find a wiring or connector fault | $122-$179 | For wiring or connector faults. |
| Check engine light diagnosis at a shop | $125-$183 | Confirms whether the valve or circuit is at fault. |
Typical US price ranges for parts and labor, not quotes. Your shop should confirm the cause with a diagnostic before replacing parts.
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Related codes
- P0441 Evaporative Emission System Incorrect Purge Flow
- P0496 Evaporative Emission System High Purge Flow
- P0440 Evaporative Emission System
- P0449 Evaporative Emission System Vent Valve/Solenoid Circuit
- P0455 Evaporative Emission System Leak Detected (large leak)