Chevrolet Code P0443 is a DTC code indicating that the Evaporative Emission (EVAP) Purge Solenoid Control Circuit is not functioning properly on the vehicle. This code is set when the ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for a minimum of 0.25 seconds. The system voltage is between 11-32 volts and the code runs continuously when these conditions are met. There are 15 related service bulletins available for further information. It is important to diagnose and repair the cause of this code as soon as possible in order to avoid further damage to the vehicle.
Causes and Solutions for Chevrolet Code P0443
| Cause | Solution |
|---|---|
| Faulty EVAP Purge Solenoid | Inspect and replace the EVAP Purge Solenoid |
| Leaking Fuel Tank | Repair/replace the fuel tank |
| Faulty Fuel Tank Pressure Sensor | Inspect and replace the Fuel Tank Pressure Sensor |
| Vacuum Leak | Inspect and repair vacuum leak |
Faulty EVAP Purge Solenoid
The most common cause of Chevrolet Code P0443 is a faulty Evaporative Emission (EVAP) Purge Solenoid. The EVAP Purge Solenoid is responsible for controlling the flow of fuel vapors from the fuel tank to the intake manifold. If the solenoid is not functioning correctly, the ECM will detect that the commanded state of the driver and the actual state of the control circuit do not match for a minimum of 0.25 seconds. This will then trigger the P0443 code, and the Check Engine Light will be illuminated. In order to resolve the issue, the EVAP Purge Solenoid must be inspected and replaced if necessary.
Leaking Fuel Tank
A leaking fuel tank can also cause Chevrolet Code P0443. When the fuel tank is leaking, the fuel vapors are not properly routed to the intake manifold, leading to an incorrect signal from the EVAP Purge Solenoid. The fuel tank must be inspected, and if any leaks are found, it must be repaired or replaced.
Faulty Fuel Tank Pressure Sensor
The Fuel Tank Pressure Sensor can also cause Chevrolet Code P0443. This sensor is responsible for monitoring the pressure within the fuel tank, and if it is faulty, it can cause the EVAP Purge Solenoid to provide an incorrect signal to the ECM. The Fuel Tank Pressure Sensor must be inspected and replaced if necessary.
Vacuum Leak
A vacuum leak can also cause Chevrolet Code P0443. Vacuum leaks can cause the EVAP Purge Solenoid to provide an incorrect signal to the ECM. The vacuum system must be inspected for any leaks, and these must be repaired in order to resolve the issue.
Conclusion
Chevrolet Code P0443 is an indication that the EVAP Purge Solenoid Control Circuit is not functioning correctly. This code can be caused by a faulty EVAP Purge Solenoid, a leaking fuel tank, a faulty Fuel Tank Pressure Sensor, or a vacuum leak. It is important to diagnose and repair the cause of this code as soon as possible in order to avoid further damage to the vehicle. In order to resolve the issue, the root cause of Chevrolet Code P0443 must be identified and then repaired accordingly.