How to Resolve the P0444 Trouble Code?
3 Answers
P0444 trouble code, applicable to all automobile manufacturers, refers to an open circuit in the evaporative emission system purge control valve circuit. Causes of the P0444 trouble code include an open circuit in the EVAP power supply circuit, an open circuit or short to ground in the EVAP solenoid control circuit, or a fault in the EVAP solenoid itself. The solutions for the P0444 trouble code are: 1. Check if the purge control valve is properly connected. 2. With the key in the ON position, verify if there is 12V voltage reaching the purge control valve. If not, inspect the wiring from the fuse box to the purge control valve. 3. Check if the resistance of the purge control valve is within the standard range. 4. If all the above checks show no issues, the problem may lie with the wiring between the ECM and the purge control valve or with the ECM itself.
I've encountered the P0444 trouble code several times, which indicates an issue with the purge flow sensor in the vehicle's emission system. Generally, I recommend starting with some simple DIY checks: disconnect the negative terminal to clear the fault code and see if it disappears; then inspect the connector near the sensor for any looseness or oxidation—sometimes just pressing it firmly can fix the problem. Vacuum hoses are common points for leaks, so feel around or listen for hissing sounds to locate any leaks. If the sensor is indeed faulty, replacing it only costs a few hundred bucks, and if you're handy, you can try doing it yourself to save money. Related issues might affect your annual inspection, and older cars are more prone to this problem—don't delay too long to prevent small issues from becoming big ones. If all else fails, it's safer to visit a professional shop and have them scan with an OBD device.
I often encounter the P0444 code during repairs, which indicates a circuit malfunction in the EVAP system's purge flow sensor. Focus on checking for short circuits or open circuits in the sensor wiring. If the multimeter shows abnormal resistance, replacement is necessary. Additionally, vacuum leaks are a common cause—inspect tubes or connectors for cracks. This system controls fuel tank vapor emissions; if not repaired properly, fuel consumption may increase or warning lights may illuminate. The general procedure involves using a diagnostic tool to clear the code and test the system response. Sometimes, the ECU module may also have underlying issues that need testing. Having a helper to inspect the wiring together can prevent misdiagnosis and unnecessary repairs, saving time and effort.
