P0446 OBD Error Code: Problem & Solutions

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The P0446 trouble code would indicate that there is a possibility of a malfunction in the vent control circuit of the evaporative emission control system. This trouble code would trigger up when the vehicle engine computer would recognize that there is some issue at the vent control of the EVAP. The P0446 does not point to a direct fault or faulty part.

The fault code P0446 can be described as Evaporative Emission Control System Vent Control Circuit Malfunction.

The error code P0446 would indicate that there is an inappropriate drop of voltage in the vent valve circuit in the EVAP system. This drop can be caused because of too much or too little electrical resistance. Now it this would happen, then it would mean that a breakdown is about to happen in the vent valve of the EVAP system.

What causes this problem with the Evaporative Emission Control System Vent Control Circuit Malfunction?

• There can be faulty, missing or broken gas cap
• Faults in the EVAP system hose
• There can be leakage in the fuel tank
• The charcoal canister might be broken or defective
• Defects in the vent valve
• Open, short or excessive resistance on vent valve control circuit
• Blockage of vent valve
• Defaults in the powertrain control module

1. Carbon Canister - A faulty Carbon Canister can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Gas Tank Sealer - If everything is alright with PCM, then there is surely some defect in Gas Tank Sealer. Get it replaced before the situation gets worse.
3. Charcoal Canister - P0446 code can display due to some faults in the Charcoal Canister. So, it is very important to replace the Charcoal Canister with us at equitable prices.
4. Evap Purge Valve - Do you remember when was the last time you got your car Evap Purge Valve inspected up? A damaged Evap Purge Valve can cause a lot of issues like displaying P0446 code.
5. Purge Solenoid - Are you facing some faults in your Purge Solenoid? Don’t worry and get them replaced or else P0446 code can turn up.
6. Fuel Tank - Common cause behind this P0446 error code can be some fault in Fuel Tank. So, it will be a good decision to replace them now.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0446 here:

Common Symptoms

• An illumination in the malfunction indicator lamp
• The fuel economy can start diminishing
• Issue of fuel odour which can be caused due to released fuel vapours
• The car engine might idle, stall or hesitate

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• Replace the faulty vent valve
• You can always repair open, short, or resistance problem in control circuit
• The damaged PCM should be repaired
• Repair the short, open or resistant control circuit
• Restore your vehicle’s PCM
• If there are some faults in the EVAP system vent valve, then it should be surely replaced

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Here are some steps which you should follow in order to diagnose this fault code:

• Use the scan tool to check for any codes present and notes any freeze frame data
• Clear all codes from the vehicle's computer
• Perform a road test of the vehicle to confirm the complaint
• Perform a visual inspection on all of the EVAP system components looking for damage to the gas cap, fuel tank, EVAP lines, and charcoal canister
• Carefully check the gas cap for any damage and insures proper fitment with a gas cap tester
• A scan tool should be used to monitor tank pressure data and make sure it is reading properly
• Perform a self-test of the EVAP system with a scan tool to check the functions of all the valves and solenoids
• Perform a smoke test of the EVAP system if no conclusive answers arise from any of the previous test

Common Mistakes When Diagnosing The P0446 Code

Mistakes can commonly occur with the P0446 code when care is not taken to follow all steps without skipping any. P0446 can be caused by many different components so care must be taken to test all of these properly to avoid misdiagnosis