P0443 code meaning
EVAP System Purge Control Valve A Circuit
Powertrain system Generic code P04xx codes Check engine light
What P0443 means
The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. P0443 is the electrical check of purge valve A, which the module switches to ground in pulses; it compares the driver's feedback voltage with the commanded state. GM uses it for an open circuit (200 kΩ or more, 20 of 25 samples, MIL after two trips) and reports shorts as P0458/P0459; Ford covers open and short in P0443 (5 s). Purging then stops, the canister is no longer regenerated, and the leak and purge monitors are suspended.
P0443 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0443
- Check engine light on
- Possibly fuel smell (no purging)
- EVAP leak test does not run
Common causes of P0443
- Most likelyPurge valve connector corroded, loose or off
- PossiblePurge valve coil open or shorted
- PossibleControl wire broken or chafed, or supply missing (fuse, main relay)
- Less likelyDriver in the engine module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP purge valvePurge valve wiringEngine control module
What each part of P0443 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 43 | The exact fault in that area. |
What to do next
- Note P0443 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0443
What does P0443 mean?
P0443 means "EVAP System Purge Control Valve A Circuit". The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. It is a generic code, so it means the same on every make.
Is it safe to drive with P0443?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0443 fail an emissions test?
Yes, it can. P0443 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0443 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0443 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.