P0443 Obd2 Code: Meaning, Causes, Symptoms, & Fixes

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How to fix P0443 obd2 code?
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The vehicle’s EVAP system (the evaporative control system) is responsible for preventing the release of gasoline vapors into the atmosphere. If there are any issues in the EVAP system, your vehicle’s primary computer, commonly known as the powertrain control module (PCM), records diagnostic trouble codes (DTC). Depending on the nature of the issues, one such code is P0443.

OBD2 Code P0443; What is it and what does it indicate?

OBD2 Code P0443; What is it and what does it indicate?The diagnostic trouble code (DTC) OBD2 P0443 is associated with the Evaporative Emission System Purge Control Valve “A” Circuit. When your vehicle’s PCM identifies a problem with the EVAP system purge valve or its control circuit, it illuminates the code indicating the problem.

This problem code can occur to any vehicle equipped with an OBD-II port, as well as vehicles constructed between and onward 1996, however, they differ in the description, diagnostic methodologies, and repair specifications from one vehicle manufacturer to the next. 

OBD2 P0443 Code Error; Causes 

OBD2 code error P0443 can occur by several factors. Therefore, you must discover the actual reason for the code to appear. 

Here are some factors that contribute to the code po433 error. 

You must know that for a P0443 to be triggered a problem with the purge control CIRCUIT, not the valve, must exist. Typically, a purge control circuit consists of a single device that has both the valve and the solenoid functions. Additionally, it might be comprised of a separate solenoid that is linked to a purge valve through vacuum lines. 

However, here are a few reasons that can cause the P0443 error.

  • A malfunctioning driver circuit inside the powertrain control module (PCM) might be the cause of the problem.
  • Rubbing of the wire harness against another component shorting the control circuit.
  • There is a possibility of an internal short or an open circuit in the purge solenoid.
  • Water infiltration in the connection can cause broken, cracked, or shorted circuits.

OBD2 Error Code P0443; Symptoms

A malfunction indicator lamp (MIL) light might be the cause of the P0443 error code. However, you may not feel any issues with driving. These symptoms are usually accompanied by additional EVAP codes, but if you face certain issues with your vehicle, it can point out to P0443 OBD2 code error.

  • Escaped vapor might generate a noticeable gasoline odor.
  • The check engine light comes on.
  • There may be a little reduction in fuel mileage.
  • When removing the cap, you may hear a “whooshing” sound generated by high pressure in the gas tank, which might indicate a faulty or jammed closed purge valve.
  • A jammed open purge valve might be causing your engine to run rough.

OBD2 P0443 Code Error; Diagnosis

To detect the root cause, an accurate diagnosis is essential. It helps you in saving time and effort along with money. 

  • The first and most crucial step is to scan for codes, using an OBD2 code scanner and record the data in the ECM. 
  • Check the purge control valve for proper resistance before being tested to ensure that it is compatible with the ECM.
  • After that, examine the freeze frame data to identify when the issue occurred.
  • Inspect the wiring and system of the vapor purge valve to look for corrosion, damaged or loose connections, or wires throughout the system, including the purge valve connector.
  • Examine the purge valve outlet for any obstructions such as dirt, or debris.
  • Perform a smoke leakage test on the fuel vapor system with the use of the test vapor port to determine the source of the leak, if there is any.

Mistakes to Avoid When Diagnosing The P0443 Obd2 Code

Precise and accurate diagnosis is essential to resolve the main issue for P0443 error code clearance. Most people overlook certain factors that can lead to incorrect diagnoses. For instance;

  • Do not assume that the purge control valve is faulty if you are not performing a thorough analysis; however, the issue might be with the wiring instead of the valve.
  • Unable to detect the failure and changing components that may or may not be at fault.

How To Fix P0443 ObdII Code

How To Fix P0443 

Are you looking for any solutions to fix the P0443 error code? Then you’ve come to the right place. Here are some fixes that you can perform to resolve the issue. 

  • The leak detecting pump should be changed if it is malfunctioning.
  • The EVAP lines or canisters that have been damaged should be repaired.
  • To purge the solenoid, make sure there are no open or short circuits in the voltage feed circuit.
  • The purge command circuit in the PCM should be fixed correctly if it is open.
  • The defective purge solenoid should be replaced.
  • If necessary, the vacuum switch should be fixed or replaced.
  • Restriction in the EVAP line, canister, or solenoid should be restored.
  • The resistance in the purge connection may always be repaired.
  • If the PCM has any flaws, it should be replaced immediately.

Vehicles that usually face P0443 issues?

This issue can occur to any vehicle with the OBD2 port. 


Where is the purge valve located in a vehicle?

The purge control valve for the canister is usually found in the engine compartment on a line that connects the intake to the canister. You can also possibly find it near the gasoline tank.

What are the signs that my purge valve is stuck open?

The purge valve’s most typical issue is that it sticks open or does not shut completely. Therefore, your vehicle illuminates the  “Check Engine light”. If you are facing issues with starting the vehicle right after refilling at a gas station, there is a possibility that your purge valve is stuck open. Moreover, you may feel the engine running rough and stuttering for the first few seconds after refilling gas. 

How much does a purge valve replacement cost?

You can expect roughly $150 to $200 when it comes to replacing the canister purge valve.

The components are the most costly portion here, costing between $75 and $110. On the other hand, the labor is usually around $50.