Emissions

P0443 — EVAP Purge Control Valve Circuit Fault

Severity: low Safe to drive

What P0443 means

The EVAP system traps fuel vapors in a charcoal canister, and the PCM later releases them into the intake through a purge solenoid valve to be burned. P0443 sets when the PCM sees an open circuit, a short, or incorrect resistance in that valve's electrical circuit. It points to an electrical problem, not a leak in the system.

Symptoms

  • Check engine light on
  • Failed emissions test
  • Slightly rough idle (sometimes)
  • Hard starting after refueling (sometimes)
  • Fuel odor
  • May appear with P0441 or P0455

Possible causes

  1. Failed purge valve (open or shorted coil)
  2. Damaged wiring to the valve (open, short, chafed insulation)
  3. Corroded or loose valve connector
  4. Blown fuse or a power supply problem in the circuit
  5. Faulty PCM purge driver (rare)

How to diagnose

  1. Scan for codes and freeze frame data, clear the code and see whether it returns
  2. Make sure the fuel cap is seated, and inspect the canister and hoses
  3. Inspect the valve connector and harness for corrosion, chafing or rodent damage
  4. Check the fuse and confirm power at the valve connector
  5. Measure the valve coil resistance and compare it with the spec for your vehicle
  6. Command the valve with a scan tool and confirm it clicks and responds
  7. Test the control wire for opens, shorts to ground and shorts to power
  8. If wiring and valve are good, check the control signal from the PCM

Common fixes

  • Replace the purge valve
  • Repair the wiring or replace a damaged connector
  • Replace the fuse and find out why it blew
  • Repair or replace the PCM if its driver has failed (rare)

P0443 on different brands

Ford · manuals
Ford uses the extended code P0443:01 for 2024–2025 gasoline engines, meaning purge control valve "A" circuit; it identifies the condition the monitor detected, not a confirmed failed part.

Questions and answers

What does P0443 mean?

The PCM detected an electrical fault in the EVAP purge valve circuit, such as an open, a short or wrong resistance. The valve itself or its wiring is the most common culprit.

Can I drive with code P0443?

Usually yes, it is not a safety risk. Still, don't wait too long: you may release fuel vapors, smell fuel, get uneven running and fail an emissions inspection.

How is P0443 different from an EVAP leak code?

P0443 is about the valve's electrical circuit, so start with the valve, connector, fuse and wiring. Codes like P0441 and P0455 relate more to flow and leaks, but they can show up together.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.