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P0444 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Purge Control Valve Circuit Open". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0444 indicates a problem has been detected with the Evaporative Emission Control System (EVAP).
The P0444 code refers to a detected issue with the EVAP circuit. This may relate to a malfunction or disconnection with one of the system's components, including (but not limited to) the system pressure and flow sensors, electrical wiring, the fuel tank and lines, or the gas cap.
The PCM monitors the EVAP's pressure and flow. If a reading is given that does not line up with the manufacturer's parameters, the vehicle's computer will log the issue. A P0444 code is usually the result of an issue with a faulty or broken component of the EVAP system. Although it is sometimes the result of a faulty PCM, this is a rare cause and should only be considered once all other options are exhausted.
On its own, the P0444 code does not have practical symptoms. However, it may be identified by the stored OBD-II code and malfunction lamp on the vehicle's dashboard.
The P0444 code can be identified by using an OBD-II code reader. From there, the mechanic should check all lines and components relating to the EVAP individually for signs of wear damage or disconnection. If the vehicle's engine is turned on, a mechanic may be able to pinpoint a potential vacuum leak by listening for an abnormal suction sound in the vacuum lines. If you have a smoke machine, filling the EVAP system with smoke can offer a visual indication of the leak.
Sometimes the issue does not lie with the EVAP itself, but with a vacuum leak elsewhere. An improperly tightened fuel cap may also result in symptoms of a P0444 code. As a result, parts of the EVAP are sometimes replaced without purpose. Check the vacuum lines and fuel cap beforehand to rule them out as possible causes.
On its own, the P0444 code is not a serious issue. However, it often comes alongside other codes relating to the EVAP system. Any problems relating to a vehicle's system pressure should be addressed quickly.
The EVAP system is primarily intended to reduce vehicle emissions. A faulty EVAP will make your car less eco-friendly.
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