P0444 EVAP System Purge Control Valve A Circuit Open

Not urgent

The circuit is broken somewhere - a cut wire, a corroded pin or an unplugged connector means the signal never arrives.

Can you drive it? This is an emissions/EVAP fault. It will not hurt the engine and the car drives normally, but it will fail an emissions test and keeps the light on.

The definition

P0444: EVAP System Purge Control Valve A Circuit Open.

P0444 is a powertrain code (the engine or gearbox), defined by the SAE standard - it means the same thing on any make of car, and any generic OBD-II reader will decode it.

What to check first

Cheapest and fastest checks first:

Check the connector is fully seated and the locking tab is engaged. A half-seated plug is the single most common cause of an open circuit.
Back-probe the pins and check continuity from the part back to the module connector.
Inspect for a pushed-back or corroded terminal - the wire looks fine but the pin has backed out of the housing.

What actually causes this on a VAG

Same purge valve as P0443, but here the engine management has specifically decided the circuit is open - the current it expects simply isn't flowing. In practice that means a break somewhere: a connector that isn't making contact, a broken wire, or a burnt-out solenoid winding. The car will normally drive as it always did. If the valve never opens, the charcoal canister can gradually saturate over time, and a saturated canister can bring a fuel smell around the car or an awkward restart just after filling up - that's a consequence of leaving it unrepaired rather than something you should expect to see straight away.

Most likely causes, in order

Connector unplugged, loose or corroded. Always the first look, particularly if the car has recently had work done anywhere near the engine top. Pull the plug, check the pins are clean, straight and fully home, and that the locking clip actually latches.
Broken coil inside the valve. A failed winding reads as no continuity across the valve's two terminals with the plug removed. If it's open circuit at the valve, the valve is the fault and it's a cheap part.
Broken or chafed wire between valve and ECU. Look for a wire rubbed through on a bracket or edge, and for any earlier tape-and-twist repair that has since let go. Wiggling the loom while the fault is live often makes it show itself.
Lost supply to the valve. The valve takes a live feed on one side, with the ECU completing the circuit on the other. If that feed is missing - a blown fuse, or a fault at a supply point shared with other components - the circuit reads as open. Where the supply is shared you'll often find unrelated faults stored alongside it, so read the whole fault list before condemning anything.

Worth knowing: Check the plug before you order anything. Heat-hardened connectors on VAG engines let go, and a valve that appears to have failed often turns out to have simply lost its feed or to have a poor connection at the plug. If the valve really is open circuit across its own terminals, buy a valve - not a canister and not a smoke test.

Reading the code is the easy part

A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.

VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.

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Prefer to work on your phone? The VAGPULSE Android app is a free download and its demo mode runs against a sample car with no hardware at all, so you can see exactly what it reads before spending anything. Reading your car with it needs the VAGPULSE cable, which comes with the licence.

Common questions

What does P0444 mean?

P0444 means EVAP System Purge Control Valve A Circuit Open. The circuit is broken somewhere - a cut wire, a corroded pin or an unplugged connector means the signal never arrives.

Can I drive with P0444?

This is an emissions/EVAP fault. It will not hurt the engine and the car drives normally, but it will fail an emissions test and keeps the light on.