P0446 Chevy CodeI have an evap code (P0446) on my 2004 Silverado 2500HD (6. Simply put, the computer has detected an issue regarding the functionality of your. P0446 is a diagnostic trouble code (DTC) associated with a vehicle’s evaporative emissions control system. Intro Chevy impala Code P0446 EVAP System Vent Control Circuit Fault, Diagnosis and Repair K Diagnostics 25. Secondly, for fuel to come spilling out as soon as the pump shuts off. 2004 chevy silverado, code P0446: (EVAP) vent control circuit malfunction. What should I do about my 2004 suburban K1500 with a P0446. P0446 Evaporative Emission Control System Vent Control Circuit …. The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). It’s giving a P0446 code which says evaporative emission system vent control circuit. P0446 definition: Evaporative Emission Control System Vent Control Circuit Malfunction Issue Severity: LOW- Continued driving for a short period of time is okay. The first place to check is the gas cap. I have tested purge solenoid and it is allowing vacuum to evap canister at acceleration. Replacing a faulty vent control valve is one of the most common fixes for the P0446 code in a Chevy Silverado. P0446 Code – Evaporative Emission Control System Vent …. The P0446 code indicates that there is a problem with the evaporative emission control system. I have tested…">1998 Chevy C1500 5. The P0446 is an error code that indicates a problem with the Evaporative Emission Control (EVAP) system. Put in simpler terms, this code indicates that there’s a problem with the vent valve, the control circuit for that valve, or a blocked vent valve in the EVAP system. com%2ftrouble-code%2fp0446%2f/RK=2/RS=b6FK13. Chevy Malibu P0446 OBDII Code Diagnosis. P0446: Evaporative Emission Control System Vent. 2002 Chevy S10 LS extended cab 4. If you're getting a P0446 trouble code on your OBD-II scanner, read on to get an idea of what this means, what may have caused it, and how you can diagnose and fix it. html See more Reply Save Like Bjay · #8 · Jan 29, 2021 I recorded a video showing how to remove and install a fuel pressure sensor on 2005 GMC Canyon. Let's have a look at this Chevrolet Cobalt that came with a code P0446 for the EVAP Vent Solenoid Performance. P0446 Indicates that there is a fault in the evaporative emission control system. For that reason, the P0446 code will sometimes be a sign that an electrical failure has been detected with either the control circuit or the vent valve, which may result in any number of codes. On the other hand, the Toyota Camry hasn’t listed the code P0446 since the 2007 model. P0446 Chevy S10. 2004 chevy silverado, code P0446: (EVAP) vent control circuit malfunction. P0446 - Evaporative Emission Control (EVAP) System Vent Control Circuit Malfunction P0446 Explained - EVAP Emission Control System Vent Control Circuit Malfunction (Simple Fix) FIXD. EVAP system failures are also commonly referred to as vacuum leaks. It can be a loose gas cap, loose or damaged vacuum or vent hoses, fuel tank pressure sensor, vent valve itself, wiring. If the gas cap didn't work, examine the EVAP system for leaks: Remove the vent tube from the EVAP Vent Control Valve by pinching it. The cost of diagnosing the P0446 2017 Chevrolet Silverado code is 1. P0446 is an OBD2 diagnostic trouble code that indicates a fault within the evaporative emission control system. How to Fix the Code P0446: What’s Behind the Issue. Simply put, the computer has detected an issue regarding the. The fault code P0446 means your vehicle’s evaporative emission control system or the vent valve in the EVAP system is malfunctioning. P0446 Evaporative Emission Control System Vent …. P0446 code definition. Code P0446, otherwise known as Evaporative Emission Control System (EVAP) Vent Control Circuit Malfunction, indicates that your car’s computer has detected (or believes it has detected) a problem with the function of the EVAP system vent valve. Line to tank I can't suck from or blow back to tank. Last one I fixed was a broken wire at the evap canister. i have an 02 chev blazer with w engine code. Information on diagnosing and repairing a vehicle DTC trouble code P0446 which is EVAP emission control system incorrect purge flow. P0446 Code Meaning, Causes, Symptoms, & Tech Notes">P0446 Code Meaning, Causes, Symptoms, & Tech Notes. Note: The fault code P0446 is one of the most common trouble codes with the GMC Sierra and Chevy Silverado. Chevy GM truck P0446 diagnosis. Your OBD-II Trouble Codes. P0446 Code: Evaporative Emission Control System Vent Control Circuit. P0446 is a diagnostic trouble code (DTC) associated with a vehicle's evaporative emissions control system. This code means that the car’s computer detected trouble with the EVAP system vent valve’s function. | Code P0446 2017 Chevrolet Silverado Description This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. A clogged canister can also trigger the P0446 code. It often appears with other codes, such as P0420, P0441, or P0440. P0446 code is set off when the computer of your vehicle's engine detects a restriction or a problem at the vent control portion of the Evaporative (EVAP) Emission Control System. How do you troubleshoot code P0446 ? Charcoal Canister and Vent Control Valve Control circuit malfunctions, as suggested by the definition, are related to problems in the circuit. Trouble code P0446 typically turns up in On-Board Diagnostic testing on account of an illuminated Check Engine Malfunction Indicator Lamp. Code P0446 2018 Chevrolet Silverado Description This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. Using an OBD II scanner, read the codes stored in the ECU and make sure this is the only one before you start diagnosing the cause. P0446 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Vent Control Circuit Malfunction". P0446 Chevy: Evaporative Emission System Vent …. Code P0446 Chevrolet Description This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent. or P0449: Evaporative Emission (EVAP) Vent Solenoid Control Circuit. P0446 - Evaporative Emission Control (EVAP) System Vent Control Circuit Malfunction P0446 Explained - EVAP Emission Control System Vent Control Circuit Malfunction (Simple Fix) FIXD 61K. P0446 is a PITA to diagnose because it can be caused by so many things. What the P0446 code means. Code P0446 2016 Chevrolet Silverado Description This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. Gas caps are inexpensive and frequently the solution to code P0446. A prevalent issue with the Chevy Equinox is the P0446 code. … read more Pete Automotive Diagnostic Specialist General auto certifications 39,125 satisfied customers. The P0446 code in a Chevy Silverado means that there is a problem with the evaporative emission control system (EVAP). P0446 Chevy Aveo OBDII Code Diagnosis. EVAP Failure Symptoms Engine code P0449, P0440, P0441, P0446 Poor idling Out of spec air-to-fuel ratios Difficulty starting the engine, in some cases If you have a small leak, you might not notice any symptoms. LqAYpZ2oibjgfhNE4dC4-" referrerpolicy="origin" target="_blank">See full list on mechanicbase. Need help with diagnosing your trouble code? We can help!. the code p0446 is coming up, I already replaced purge valve canister and gas cap but the code is still there, its a 2006 chevy silerado 1500 … read more Ron Z. This trouble code references a number that is given to you when you plug your S10 into a OBDII scanner. The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP). Drove ~50 miles and the check engine light came back on. What Does the P0446 Chevrolet Code Mean? This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that. My 2016 Cruze LT Check engine light has been going on and off. 1998 Chevy C1500 5. code (P0446) on my 2004 Silverado 2500HD">I have an evap code (P0446) on my 2004 Silverado 2500HD. 5 I got code p0446 I changed…. Chevy Equinox P0446 OBDII Code Diagnosis. The vent valve is managed by your car’s computer (it also controls the purge valve). Let's have a look at this Chevrolet Cobalt that came with a code P0446 for the EVAP Vent Solenoid Performance. The P0446 fault code stands for Evaporative Emission Control (EVAP) system vent control circuit malfunction. I have an evap code (P0446) on my 2004 Silverado 2500HD (6. Code P0446 Chevrolet Description This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. The fault code P0446 means your vehicle's evaporative emission control system or the vent valve in the EVAP system is malfunctioning. | Code P0446 2017 Chevrolet Silverado Description This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. I have a p0446 code for the engine and i was wondering if you could tell me where the vent purge solenoids is located on Ask an Expert Car Questions Chevrolet Repair chevy avalanche i have a p0446 code for the engine and i was… Paul M ASE Master, ASE Master Tech Satisfied Customers ASE Master Tech 20+ Years Paul M ASE Master is online now. P0446: Evaporative Emission Control System Vent Control Circuit Malfunction P0446 is normally not an immediate threat to the drive-ability of your vehicle. Chevy impala Code P0446 EVAP System Vent Control Circuit ">Chevy impala Code P0446 EVAP System Vent Control Circuit. If you’re getting a P0446 trouble code on your OBD-II scanner, read on to get an idea of what this means, what may have caused it, and how you can diagnose and fix it. P0446 is an OBD2 diagnostic trouble code that indicates a fault within the evaporative emission control system. The P0446 code indicates that there is a problem with the evaporative emission control system. Diagnosing the cause of the P0446 code isn’t very difficult if you know where to look and have the required tools for the job. Cleaning the Charcoal Canister: The charcoal canister helps to filter and store fuel vapors. Trouble code P0446 typically turns up in On-Board Diagnostic testing on account of an illuminated Check Engine Malfunction Indicator Lamp. Information on diagnosing and repairing a vehicle DTC trouble code P0446 which is EVAP emission control system incorrect purge flow. P0446 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Vent Control Circuit Malfunction". This system is responsible for controlling the release of vapors from the fuel. It signifies an issue in the vent control circuit in your Chevy Silverado’s EVAP system, which prevents fuel vapor from being released into the atmosphere. Answered in 3 minutes by: Chevy Mechanic: kalamykid kalamykid : The most common reason for these codes is a bad vacuum line from the intake to the evap solenoid on the driver side of the engine. A faulty vent control valve most commonly causes P0446. Using an OBD II scanner, read the codes stored in the ECU and make sure this is the only one before you start diagnosing the cause. Under precise operating conditions—dictated by engine temperature, speed, and load—the EVAP system stores. The exact description of the issue differs from one car model to the other, so you'll need to do some testing to pinpoint the defective component. P0446 code definition. What the P0446 code means. i have codes p0446,p0452. Code P0446 2018 Chevrolet Silverado Description This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. P0446 – Evaporative Emission (EVAP) Vent Control Circuit ">P0446 – Evaporative Emission (EVAP) Vent Control Circuit. This could usually mean a faulty vent valve, an inadequate control circuit for that valve, or a blockage in the vent valve itself. Fixing a P0446 Code on Chevy Silverado. It signifies an issue in the vent control circuit in. What is P0446? The fault code P0446 means your vehicle’s evaporative emission control system or the vent valve in the EVAP system is malfunctioning. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. OBD-II Code P0446 is defined as a Evaporative System Vent Control Circuit Malfunction. This mayrefer to the circuit in the sensor or actuator itself, but do not simply “replace the valve” because the DTC refers to the vent control valve circuit. The P0446 code is triggered by the ECU when a malfunction occurs with the EVAP control system vent control valve. Note: The fault code P0446 is one of the. The P0446 code in a Chevy Silverado means that there is a problem with the evaporative emission control system (EVAP). Pulling … Automotive Tech Vocational, Technical or Tra 43,742 satisfied customers. Chevy Silverado Evap P0446 Diagnosis and Fix | Using Scan Data and Critical Thinking Valley Mobile Automotive 8. Intro Chevy impala Code P0446 EVAP System Vent Control Circuit Fault, Diagnosis and Repair K Diagnostics 25. The EVAP is important as it prevents fuel vapors from escaping into the atmosphere and causing environmental harm. Code P0446 2008 chevy tahoe Can't fuel up with out stop and go on the gas pump. What Does the P0446 Code Mean? This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. How to Diagnose the Cause of P0446 Code. Gas caps are inexpensive and frequently the solution to code P0446. This improper electrical condition will cause the vent valve to malfunction. I just replaced the Evap control Solenoid (on the manifold) and the Cvap canister vent valve (in the back near the tank). Code P0446 2018 Chevrolet Silverado Description This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to. P0446 Chevy, also known as evaporative emission system vent control circuit malfunction, indicates that the computer in your vehicle has discovered (or believes it has identified) a problem with the. It signifies an issue in the vent control circuit in your Chevy Blazer's EVAP system, which prevents fuel vapor from being released into the atmosphere. 1K subscribers Subscribe 225 Share 13K views 1 year ago Diagnostic & Car Repair. It signifies an issue in the vent control circuit in your Chevy HHR’s EVAP system, which prevents fuel. The Engine Control Module (ECM) commands the EVAP purge solenoid valve Open and the EVAP vent solenoid valve Closed. Repair Urgency: Get this code fixed withing the next month to prevent issues related to the emissions system including failed inspections. It signifies an issue in the vent control circuit in your Chevy Monte Carlo’s EVAP system, which prevents fuel. Posted by Anonymous on Jul 30, 2014 2 Answers taterhead 3e Chevrolet Expert 200 Answers Evap solinoid on intake is bad ,,, stuck open,,,hard start or no start and smell of gas,,, 25 bucks and 5 min to fix Posted on Jan 04, 2015 Anonymous. Code P0446 indicates that there is an improper voltage drop in the EVAP Vent Valve circuit, which can be caused by either too little or too much electrical resistance. Note: The fault code P0446 is one of the most common trouble codes with the GMC Sierra and Chevy Silverado. What Does the P0446 Code Mean? Trouble code P0446 stands for an Evaporative Emission Control System (EVAP) Vent Control Circuit Malfunction. Your OBD-II Trouble Codes Repair Site. Code P0446 Chevrolet Description This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. Chevy Blazer P0446: Meaning, Causes, How to Fix. The vent valve is managed by your car's computer (it also controls the purge valve). Most auto repairs shops charge between $75 and $150 per hour. Chevrolet 1500: P0446 EVAP Vent Performance 270,324 views Oct 11, 2019 In this video i have a look at a 2003 Chevrolet 1500 that has a P0446 Canister Vent Valve Performance code stored in. 5 I got code p0446 I changed…">I have a 2006 Chevy Impala 3. I was able to find several videos on how to do this. Chevrolet 1500: P0446 EVAP Vent Performance 270,324 views Oct 11, 2019 In this video i have a look at a 2003 Chevrolet 1500 that has a P0446 Canister Vent Valve Performance code stored in. A code P0446 could mean one or more of the following has happened: Faulty vent valve Open, short or excessive resistance on Vent valve control circuit Blockage of vent valve Bad PCM Possible Solutions With a P0446 OBD-II trouble code, here are some things to try: Replace Vent valve Repair open, short, or resistance problem in control circuit. 1K views 1 year ago #cars #carmechanic. What Does the P0446 Chevrolet Code Mean? This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. Use an EVAP smoke machine leak check to pressurize the EVAP system and check if any hoses or seals are leaking smoke. P0446 Trouble Code: EVAP System Vent Control Circuit Malfunction">P0446 Trouble Code: EVAP System Vent Control Circuit Malfunction. How to Diagnose the Cause of P0446 Code. Table of Contents Definition Symptoms Causes Diagnosis How to Fix P0446 Definition P0446 is a standard OBDII trouble code,. 7 Pulling a P0446 code. This code corresponds to a specific number obtained when connecting your HHR to an OBDII scanner. What Does the P0446 Code Mean? This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. This vent valve is also known as the purge valve. The FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. Other EVAP system codes may be seen with P0446. The P0446 is an error code that indicates a problem with the Evaporative Emission Control (EVAP) system. P0446 Trouble Code: EVAP System Vent Control Circuit Malfunction. The Engine Control Module (ECM) commands the EVAP purge solenoid valve Open and the EVAP vent. The EVAP system comprises several critical components, including the gas cap, charcoal canister, purge valve, and vent valve. What is P0446? The fault code P0446 means your vehicle’s evaporative emission control system or the vent valve in the EVAP system is malfunctioning. 14780 Views 14 Replies 5 Participants Last post by Blackout92, Sep 7, 2018. I also tested all my fuses and assured that adequate power was being supplied to the solenoid. Im not quite sure what else it could be. Vocational, Technical or Tra satisfied customers Working on a 2005 Chevy equinox with a 3. Correctly diagnosing P0446 code on Chevrolet and GM cars and trucks Show more. Home; Trouble Codes; FAQs; Forums; Store; Search; 2000 Chevy Silverado P0446 I have a 2000 Chevy Silverado, I get a code of P0446 when my gas tank reads half or. P0446 Code – Evaporative Emission Control System Vent Control ">P0446 Code – Evaporative Emission Control System Vent Control. P0442 Chevrolet Code Meaning, Causes, Symptoms, & Tech Notes. If the EVAP system detects a leak, it triggers the DTC P0446. I have an 02 chev blazer with w engine code. A smoke test pushes smoke through the EVAP system to see if the smoke exposes any leaks. P0446 Evaporative Emission Control System Vent Control Circuit Malfunction The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission. P0446 is a diagnostic trouble code (DTC) associated with a vehicle’s evaporative emissions control system. On the other hand, the Toyota Camry hasn't listed the code P0446 since the 2007 model. P0446 definition: Evaporative Emission Control System Vent Control Circuit Malfunction Issue Severity: LOW– Continued driving for a short period of time is okay. The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). A P0446 error code indicates an evaporative emission control system (EVAP) vent control circuit malfunction. Intro Chevy impala Code P0446 EVAP System Vent Control Circuit Fault, Diagnosis and Repair K Diagnostics 25. A loose fuel tank filler cap is the most common cause that will trigger the P0442 code. P0446 CODE: What does it mean and How to Fix it. Other EVAP system codes may be seen with P0446. com/_ylt=AwrFANdSrWBkXjElTbVXNyoA;_ylu=Y29sbwNiZjEEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1684086226/RO=10/RU=https%3a%2f%2fmechanicbase. This system is responsible for controlling the release of vapors from the fuel tank. The P0446 code in a Chevy Silverado means that there is a problem with the evaporative emission control system (EVAP). It often appears with other codes, such as P0420, P0441, or P0440. Replacing a faulty vent control valve is one of the most common fixes for the P0446 code in a Chevy Silverado. Some mechanics use a smoke test to check for leaks. The P0446 code may be caused by a failed EVAP canister, a blocked EVAP vent hose, or a leak in the EVAP system. The diagnostic chart in the FSM is 3 pages. The P0446 code is triggered by the ECU when a malfunction occurs with the EVAP control system vent control valve. What Does the P0446 Code. P0446 - Evaporative Emission Control (EVAP) System Vent Control Circuit Malfunction P0446 Explained - EVAP Emission Control System Vent Control Circuit Malfunction (Simple Fix) FIXD 61K. P0446 Chevy: Evaporative Emission System Vent Control Circuit. The man at Autozone who pulled the code for me says I need to replace the canister purge valve. The P0446 fault code stands for Evaporative Emission Control (EVAP) system vent control circuit malfunction. Chevy Suburban P0446 OBDII Code Diagnosis. P0446 is a PITA to diagnose because it can be caused by so many things. What Does the P0446 Code Mean? This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. Chevy Silverado Evap P0446 Diagnosis and Fix | Using Scan Data and Critical Thinking Valley Mobile Automotive 8. com/p0446 2013-2022 GM Vapor Canister Purge Valve 12632174 | GM Parts Center. If the EVAP system detects a leak, it triggers the DTC P0446. What Does the P0446 Code Mean? Code P0446, otherwise known as Evaporative Emission Control System (EVAP) Vent Control Circuit Malfunction, indicates that your car's computer has detected (or believes it has detected) a. This code means that the car’s computer detected trouble with the EVAP system vent valve’s. Correctly diagnosing P0446 code on Chevrolet and GM cars and trucks. Chevy Silverado Evap P0446 Diagnosis and Fix | Using Scan Data and Critical Thinking Valley Mobile Automotive 8. i have an 02 chev blazer with w engine code. The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e. Code P0446 2008 chevy tahoe. The FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. This generic OBD-II code indicates that the evaporative vent valve in the emission control system is malfunctioning. First, Code P0446 indicates that there is an improper voltage drop in the EVAP Vent Valve circuit, which can be caused by either too little or too much electrical resistance. Correctly diagnosing P0446 code on Chevrolet and GM cars and trucks. After you repair the holes (if you find any), clear the code. P0446 Chevy, also known as evaporative emission system vent control circuit malfunction, indicates that the computer in your vehicle has discovered (or believes it has identified) a problem with the operation of the EVAP system vent valve. they are all evap codes. If the P0446 code persists, check for a leak. On the other hand, the Toyota Camry hasn’t listed the code P0446 since the 2007 model. P0446 Chevrolet Code Meaning, Causes, Symptoms, & Tech …. There is a factory service bulletin for all the models from 2000 through 2021. Trouble code P0446 typically turns up in On-Board Diagnostic testing on account of an illuminated Check Engine Malfunction Indicator Lamp. Recently had code P0442, found and replaced a broken gas cap gasket. A code P0446 could mean one or more of the following has happened: Faulty evap vent valve Open, short or excessive resistance on Vent valve control circuit Blockage of vent valve Bad PCM Read more at: https://www. have a 2006 Chevy Impala 3. This code means that the car's computer detected trouble with the EVAP system vent valve's function. In all cases, it clearly shows the mechanic that a check of the EVAP vent valve is in order. Cleaning the canister can resolve the issue. P0446 Chevrolet Code Meaning, Causes, Symptoms, & Tech Notes. It often appears with other codes, such as P0420,. First, Code P0446 indicates that there is an improper voltage drop in the EVAP Vent Valve circuit, which can be caused by either too little or too much electrical resistance. the fuel tank, filler neck, and fuel cap). If the gas cap is faulty, damaged, or deteriorating, replace it and then clear the code. The EVAP is important as it prevents fuel vapors from. i have codes ">I have an 02 chev blazer with w engine code. P0446 Code – Meaning, Causes, Symptoms (& How To Fix). A prevalent issue with the Chevy HHR is the P0446 code. I have notice that most people will get sucked into the trap of changing parts. My 2016 Cruze LT Check engine light has been going on and off. DTC P0446 Evaporative Emission Vent System PerformanceHow to fix P0446 EVAP Vent system performance code on a GM or Chevy truck. P0446 Indicates that there is a fault in the evaporative emission control system. P0446 Evaporative Emission Control System Incorrect Purge Flow. What Does the P0446 Chevrolet Code Mean? This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. One of the most common trouble codes with the Chevy S10 is the P0446 code. Chevrolet 1500: P0446 EVAP Vent Performance.