P0440 Gmc EnvoyGMC Envoy P0480: Meaning, Causes & Diagnosis. Asked by lkfoster in Buford, GA on. 2 presenting with a p0440. Hello,I will be glad to try and assist you with this,Welcome to Just Answer. - Answered by a verified GM Mechanic We use cookies to give you the best possible experience on our website. What the code really indicates is that the EVAP system will not create a significant vacuum when it performs its leak test, as monitored by the Fuel Tank Pressure Sensor. P0440 Diagnosis- GMC Envoy. In fact, the leak can be from a hole as small as 0. P0440 code showing for a 03 gmc envoy. Here are the most common things that are done to diagnose the code: The mechanic will typically check to see if there are any other trouble codes. 2007 GMC Yukon For $10,300. Look for either a tear or hole in it. Inspect for damaged or disconnected hoses around the Evap purge solenoid. A very common trouble code with the Chevy Trailblazer is the P0440 code. 2004 GMC Envoy. A EVAP code P0440 is usually set due to the FTP (Fuel tank pressure) sensor not reporting the correct tank pressure , But there is a possibility it is related to the drivability that you have , and that would be the purge solenoid that sticks open at times then yes you would have stumble as you accelerate due to the engine fuel ratio going lean, …. A code P0442 GM most likely means one or more of the following has happened: A loose or improperly affixed gas cap A non-conforming gas cap (i. 2002 gmc envoy bringing up codes P0440. This could be caused by a bad or improperly installed gas cap. What Does the P0446 GMC 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. I Ask an Expert Car Questions GMC Questions Eric, Automotive Repair Shop 57,312 Satisfied Customers 20+ yrs. For circuit reference, see WIRING DIAGRAMS article. Fuel vapors are routed by hoses to a. I was lucky enough to borrow a Snap-on scan tool for a few hours and played with some of the EVAP system controls. com! Tell us about yourself, your vehicle, mods, location etc. 9K 16M Apr 18, 2023 TrailBlazer / Envoy Chat The TrailBlazer and Envoy Owners and Enthusiast lounge. Code P0440 GMC Evaporative Emission System (With Video). We started having issues with certain speeds the rpm's will go up or it is missing. Common Symptoms Of A P0440 Trouble Code A P0440 will cause the vehicle to fail an emissions. There are also some hose and lines from the fuel tank to the charcoal canister that can be the problem. any ideas how to deal with this thanks guys , and again this is a great forum, lot of. P0440 Evaporative emission control system malfunction. P0440 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Malfunction". The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). P0440 on my 2002 Tblazer LT My t-blazer is a 2002 LT. The code is caused by one bad connection on the EBCM board. Video on diagnosing and repairing code p0440 which is an Evaporative Emission Control System Malfunction on a 2002-2004 GMC Envoy with the 4. The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Volver arriba El Clasificado Facebook Twitter LinkedIn Instagram Youtube Pinterest El Clasificado es parte de EC Hispanic Media, la compañía multimedia líder de habla hispana en el sur de California. I purchased a 2003 GMC Envoy fourteen years ago, spending hundreds of thousands of dollars trying to solve the infamous P0440 EVAP code. 2003 GMC Envoy SLE XL 6cyl 4. GMC P0442 EVAP Control System Leak Detected Small Leak. Have tried changing the gas cap but. With a P0440 OBD-II trouble code, diagnosis can be tricky at times. The other common issue is the wiring that goes to fan clutch. Find Used Gmc 4wd For Sale In Montevideo, MN (with Photos). hey guys, im new here in this great forum! i have a 02 GMC envoy SLT, 131K miles , im getting the code P0440, i replaced the gas cap , (got it from the dealer), then, a month later got it back again. com%2ftrouble-code%2fp0440%2f/RK=2/RS=VDMGTI6NLih4mFqIG2UP7ToCmnU-" referrerpolicy="origin" target="_blank">See full list on mechanicbase. ⭐ 2003 Chevy Trailblazer - P0440 - Evap Emissions System Malfunction Online Auto Repair Videos 118K subscribers Subscribe 1. P0440 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Malfunction". Trouble Code P0440 EVAP System Leak Common Fix. P0440 - Evap system large leak. P0340 – Camshaft Position Sensor “A” Circuit Malfunction (GM). Any idea what it could be so I'm not. I get the code p0440, what… Eric, Automotive Repair Shop Manager Category: GMC 57,365 Experience: 20+ yrs. The Envoy’s radio’s head unit comes straight from a ‘60’s sci-fi flick. P0440 – Meaning, Causes, Symptoms, & Fixes. P0440 definition: Evaporative Emission Control System Malfunction Issue Severity: LOW – Continued driving for a short period of time is okay Repair Urgency: Get this fixed within the next month to prevent poor emissions and. The GMC Envoy 2008 is in perfect running condition. I Ask an Expert Car Questions GMC Questions. 2002 gmc envoy 4. Code P0440 causes the Check Engine Light to go on and this alone will cause a failed emission test. Loose fuel tank filler cap is the most common cause that triggers the P0440. A very common trouble code with the Chevy Trailblazer is the P0440 code. Code P0440 GMC Description The Powertrain Control Module (PCM) tests the Evaporative Emission (EVAP) system for the following conditions: - Large and small leaks - Excess vacuum - Purge flow during non-commanded conditions - Fuel Level and Fuel Pressure sensor faults - EVAP Purge and Vent Valve faults. A EVAP code P0440 is usually set due to the FTP (Fuel tank pressure) sensor not reporting the correct tank pressure , But there is a possibility it is related to. It often appears with, or is related other codes, such as P0420, P0446, and very often P0440. Used GMC Envoy 2008 (1160046). 200 Million used auto parts instantly searchable. Barely Used GMC Envoy 2008 on offer for QAR 14,000. I get the code p0440, what ">I get gmc envoy 2003, engine 4. This will cause the P0440 code. hello have a 2002 GMC envoy keeps giving me code p0440 changed the gas cap and the charcoal canister what can i do next Answered in 1 hour by: GMC Mechanic: Pete Hello,I will be glad to try and assist you with this,Welcome to Just Answer. GMC Envoy P0449 Definition P0449 is a universal OBDII trouble code. Code P0440 GMC Evaporative Emission System (With …. 2003 GMC Envoy SLE XL 6cyl 4. P0440 - Evap system large leak. 2003 GMC Envoy P0440 Evap Code: 1 Complaints. GMC Envoy P0446 Code Diagnosis. Gas cap was already replaced and p0440 persevered. With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Somos su portal de confianza en clasificados para GMC en Montevideo. On drivers side of fan shroud is the connector, it's clipped in there. A EVAP code P0440 is usually set due to the FTP (Fuel tank pressure) sensor not reporting the correct tank pressure , But there is a possibility it is related to the drivability that you have , and that would be the purge solenoid that sticks open at times then yes you would have stumble as you accelerate due to the engine fuel ratio going lean. A loose fuel tank filler cap is the most common cause that triggers the P0440 code. Trouble Code P0440 EVAP System Leak Common Fix. Code P0440 and yes I tried resetting it but it comes back. This trouble code is a reference number that is given to you when you plug your Envoy into a OBDII scanner. Evap System Hose – The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. August 13, 2018 by Jason One of the most common trouble codes with the GMC Envoy is the P0446 code. Shop our large selection of parts based on brand, price, description, and location. A P0440: Evaporative Emission Control System Malfunction means that there's a fuel vapor leak somewhere in the EVAP system. Code P0440 GMC Description The Powertrain Control Module (PCM) tests the Evaporative Emission (EVAP) system for the following conditions: - Large and small. P0495 - Cooling fan rpm too high. The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). A code P0440 could mean one or more of the following has happened: The gas cap is not installed or working properly The purge solenoid has failed The canister is plugged and not working properly Possible Solutions With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Either that or the purge solenoid has failed or the canister is plugged and not working properly. P0300 GMC Code Meaning, Causes, Symptoms, & Tech Notes (With. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. The gas cap is not installed or working properly The purge solenoid has failed The canister is plugged and not working properly. Code P0440 and yes I tried resetting it but it comes back. Answered in 7 minutes by: GM Mechanic: Wicked Wrench P1345 Notes CIRCUIT DESCRIPTION. This trouble code references a number that is given to you when you plug your Trailblazer into a OBDII scanner. P0440 Evaporative Emission Control ">OBD. Test drive Used GMC Cars at home in Marshall, MN. SOLVED: I have a 2002 gmc envoy bringing up codes P0440. Here is how the evaporative leak test is performed by the Powertrain. 2L codes p1345 po340 p0440 p1514 car will start and than quit while the key is still in the start pos. P0440 EVAP System No Flow During Purge Possible Causes Setting Conditions. P0440 - Evap system large leak. Asked by envoy2002 Sep 25, 2014 at 05:12 PM about the 2002 GMC Envoy 4 Dr SLE 4WD SUV. For the past month or so I have had the P0440 code come on. Code P0440 and yes I tried resetting it but it comes back. It indicates that your GMC Envoy’s “cooling fan 1 control circuit” is malfunctioning. Now when we are going 55 down the road it's chugging. Code P0440 GMC Description The Powertrain Control Module (PCM) tests the Evaporative Emission (EVAP) system for the following conditions: - Large and small leaks - Excess vacuum - Purge flow during non-commanded conditions - Fuel Level and Fuel Pressure sensor faults - EVAP Purge and Vent Valve faults. 2002 GMC envoy keeps giving me code p0440 changed the ">Have a 2002 GMC envoy keeps giving me code p0440 changed the. 2 engine To view the full video, you must be a member and have a Video Access Key. On occassion if we get it to start it will run. 2007 GMC ENVOY, ENGINE LIGHT,. Make sure the wires are not broken or burnt. P0440 Evaporative Emission Control System Malfunction. The P0440 code indicates that there is a large leak in the EVAP system, but this is somewhat misleading. I get gmc envoy 2003, engine 4. The 2008 GMC Envoy is a midsize SUV that's offered in three trim levels: SLE, SLT and Denali. A very common issue with the GMC Envoy is the P0449 code. hello have a 2002 GMC envoy keeps giving me code p0440 changed the gas cap and the charcoal canister what can i do next. Evap System Hose - The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. 3K 698K views 8 years ago CEL code P0440, P0441, P0442, P0446 explanation. Inspect the EVAP system for cuts/holes in tubes/hoses. I get the code p0440, what is the issue most common when this cofe appear and how can - Answered by a verified GMC Mechanic. Unfortuately, this trouble code does not pinpoint a specific component as the cause of the EVAP system failure. It’s a generic code, so it has the same meaning for any vehicle made for the 1996 model year and up. For the past month or so I have had the P0440 code come on. A EVAP code P0440 is usually set due to the FTP (Fuel tank pressure) sensor not reporting the correct tank pressure , But there is a possibility it is related to the drivability that you have , and that would be the purge solenoid that sticks open at times then yes you would have stumble as you accelerate due to the engine fuel ratio going lean,. 00 and then fix it for another around $100. A mechanic has a wide range of instruments at his disposal to diagnose what would be causing the P0440 in your GMC Envoy. Trouble Code P0440 EVAP System Leak Common Fix. This trouble code references a number that is given to you when you plug your Envoy into a OBDII scanner. I may need more info in some cases to help with answering your question. Question type: Maintenance & Repair. p0440 code means that the evap system has a leak. P0480 is a relatively common OBDII trouble code. A code P0440 could mean one or more of the following has happened: The gas cap is not installed or working properly The purge solenoid has failed The canister is plugged and not working properly Possible Solutions With a P0440 OBD-II trouble code, diagnosis can be tricky at times. The P0440 code indicates that there is a leak or malfunction in the EVAP emissions system. What can I check for the cod PO455? may be found in the fuel tank filler neck, causing a DTC P0440, P0455 and/or P0442 to set. GMC Envoy P0440: Evaporative Emission Control …. It does not allude to what that problem might be www. A loose fuel tank filler cap is the most common cause that triggers the. Video on diagnosing and repairing code p0440 which is an Evaporative Emission Control System Malfunction on a 2002-2004 GMC Envoy with the 4. Description The Evaporative (EVAP) emission large leak test applies vacuum to the EVAP system and. If one Google searches 2003 GMC Envoy. Vapor Canister Purge Valve - One of the most common causes of the. P0440 Indicates that something is wrong with the EVAP system. Possible Solutions. This is one of the most common issues. P0440 - Evap system large leak. For connector terminal identification, see CONNECTOR IDENTIFICATION. The P0440 code indicates that there is a leak or malfunction in the EVAP emissions system. A EVAP code P0440 is usually set due to the FTP (Fuel tank pressure) sensor not reporting the correct tank pressure , But there is a possibility it is related to the drivability that you have , and that would be the purge solenoid that sticks open at times then yes you would have stumble as you accelerate due to the engine fuel ratio going lean, …. P0440 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Malfunction". P0480 is a relatively common OBDII trouble code. If one Google searches 2003 GMC Envoy P0440. A forum community dedicated to Chevy Trailblazer and GMC Envoy owners and enthusiasts. P0440 on my 2002 Tblazer LT I posted this on this link on 9/2009: A forum community dedicated to Chevy Trailblazer and GMC Envoy owners and enthusiasts. hello have a 2002 GMC envoy keeps giving me code p0440 changed the gas cap and the charcoal canister what can i do next. I get the code p0440, what is the issue most common when this cofe appear and how can Ask an Expert Car Questions GMC Questions I get gmc envoy 2003, engine 4. Search from 43 Used GMC cars for sale, including a 2006 GMC Envoy Denali, a 2007 GMC Yukon SLT, and a 2008 GMC Yukon XL Denali ranging in price from $5,500 to $80,999. We use cookies to give you the best possible experience on our website. DTC P0440: EVAP SYSTEM - LARGE LEAK NOTE: To locate components, see COMPONENT LOCATIONS. "The Engine code P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). There are typically three common problems that set of a code PO440: 1) would be the fuel filler cap 2) would be the evap canister vent solenoid/valve 3) evap cannister purge solenoid/valve. I get the code p0440, what is the issue most common when this cofe appear and how can Ask an Expert Car Questions GMC Questions I get gmc envoy 2003, engine 4. 2003 GMC Envoy SLE XL 6cyl 4. I purchased a 2003 GMC Envoy fourteen years ago, spending hundreds of thousands of dollars trying to solve the infamous P0440 EVAP code. Code P0440 causes the Check Engine Light to go on and this alone will cause a failed emission test. 2002 GMC Envoy 169,000 mi, Visitor. Nov 15, 2008 • 2001 Toyota Corolla Not finding what you are looking for? Open Questions: 0 answers. hello have a 2002 GMC envoy keeps giving me code p0440 changed the gas cap and the charcoal canister what can i do next Answered in 1 hour by: GMC Mechanic: Pete Hello,I will be glad to try and assist you with this,Welcome to Just Answer. Welcome to TrailVoy. Usually the fan clutch stays engaged and is very loud at all speeds (like an airplane taking off), remove and replace fan clutch. GMC Envoy P0449 Code Diagnosis: EVAP System. 2002 gmc envoi 4. 2L codes p1345 po340 p0440 p1514 car will ">2002 gmc envoy 4. GMC Envoy P0440: Evaporative Emission Control System Malfunction. | What are the Possible Causes of the Code P0300 GMC? Faulty spark plug (s) Faulty ignition coil (s) Clogged or faulty fuel injector (s) Intake air leak Fuel injectors harness is open or shorted Fuel Injectors circuit poor electrical connection Ignition coils harness is open or shorted Ignition coils circuit poor electrical connection. We changed the spark plugs and it's still doing it. The center armrest is made of. 2003 GMC Envoy has a problem with the gas tank. GMC Envoy P0440 Evap Code: 1 Complaints">2003 GMC Envoy P0440 Evap Code: 1 Complaints. 2004 gmc envoy_slt_xuv Joined Sep 28, 2010 697 Posts #4 ·Jan 1, 2011 Only show this user Usually Efficiency is determined by the PCM comparing the Front B1S1 sensor readings to the Rear B1S2 sensor readings and comparing it to "normal" conditions programmed into the PCM. SOLVED: 2008 Envoy with P0449 code. Eric is online now Continue Related GMC Questions. hey guys, im new here in this great forum! i have a 02 GMC envoy SLT, 131K miles , im getting the code P0440, i replaced the gas cap , (got it from the dealer), then, a month later got it back again. The plastic tank cracks at the filler neck inlet, causing some gas leakage and code P0440. Camionetas Y SUVs GMC En Venta En Montevideo. P0440 GMC Code Meaning, Causes, Symptoms, & Tech Notes (With. Video on diagnosing and repairing code p0440 which is an Evaporative Emission Control System Malfunction on a 2002-2004 GMC Envoy with the 4. P0440 on my 2002 Tblazer LT I posted this on this link on 9/2009: A forum community dedicated to Chevy Trailblazer and GMC Envoy owners and enthusiasts. 2L codes p1345 po340 p0440 p1514 car will. 0 The cost to diagnose the P0440 GMC code is 1. hey guys, im new here in this great forum! i have a 02 GMC envoy SLT, 131K miles , im getting the code P0440, i replaced the gas cap , (got it from the dealer), then, a month later got it back again. com/_ylt=AwrNZF6vSFVkaIQTYKBXNyoA;_ylu=Y29sbwNiZjEEcG9zAzQEdnRpZAMEc2VjA3Ny/RV=2/RE=1683339568/RO=10/RU=https%3a%2f%2fmechanicbase. Used GMC Cars for Sale Near Me in Marshall, MN. SOLVED: Failed inspection P0440. P0440 Evaporative emission control system malfunction. The EVAP system is a sealed gas vapor system that pulls the fuel vapors from the gas tank and burns them through the engine instead of releasing them into the air. Answered in 1 hour by: GMC Mechanic: Pete. The code means the fuel vapor system has a vapor leak somewhere in the system and vapors can be very flammable and dangerous to breath the vapors. Charcoal canister is loaded with fuel or moisture;. P0449 deals with the evaporative emissions control system. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle’s fuel system. 2003 GMC Envoy SLE XL 6cyl 4. 2L with a P0440 code. I get the code p0440, what. This means that regardless of which make or model of vehicle, the code will mean the same thing (Envoy or not, as long as it was manufactured after 1996). Trouble Code P0440 EVAP System Leak Common Fix. OBD II fault code P0340 is a generic trouble code that is defined as “Camshaft position (CMP) sensor A – Bank 1 – circuit malfunction” and is set when the PCM (Powertrain Control Module) detects a failure, defect, or malfunction in the control, signal, or reference voltage circuit (s) of the position sensor that is associated with the intake …. Come join the discussion about performance, modifications, troubleshooting. The loss of vapors in the system only means the engine did not use them and this may cause a loss. The SUV’s gear lever restricts access to the HVAC controls. We have a 2003 gmc envoy. P0440 code showing for a 03 gmc envoy. With The air conditioning on the 2 vents on the drivers side blows hot air and the passenger vents. 2003 GMC Envoy SLE XL 6cyl 4. "The Engine code P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). The EVAP system is a sealed gas vapor system that pulls the fuel vapors from the gas tank and burns them through the engine instead of releasing them into the air. GM will gladly read this code out for you for around $98. It has various grounds which control different functionalities of the module. This will cause the P0440 code. my check engine light came on I had it checked and the code was p0440 is this something I can fix myself or do I need a mechanic? Asked by envoy2002 Sep 25, 2014 at 05:12 PM about the 2002 GMC Envoy 4 Dr SLE 4WD SUV Question type: Maintenance & Repair 8 Answers 140,505 T_S_T answered 8 years ago. A P0440: Evaporative Emission Control System Malfunction means that there's a fuel vapor leak somewhere in the EVAP system. It indicates that your GMC Envoy’s “cooling fan 1 control circuit” is malfunctioning. Order the part with stock number in hand. Is this the only code showing? A EVAP code P0440 is usually set due to the FTP (Fuel tank pressure) sensor not reporting the correct tank pressure , But there is a possibility it is related to the drivability that you have , and that would be the purge solenoid that sticks open at times. GMC replaces gas tanks for free (up to 160?). Come join the discussion about performance, modifications, troubleshooting, towing capacity, maintenance, and more! Full Forum Listing. 3K 698K views 8 years ago CEL code P0440, P0441, P0442, P0446 explanation and common fix. P0440 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Malfunction". This is one of the most common issues that causes the code. my check engine light came on I had it checked and the code was p0440 is this something I can fix myself or do I need a mechanic? Asked by envoy2002 Sep 25, 2014 at 05:12 PM about the 2002 GMC Envoy 4 Dr SLE 4WD SUV Question type: Maintenance & Repair 8 Answers 140,505 T_S_T answered 8 years ago. I got a code P0440? I have an 03 Envoy. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154. A forum community dedicated to Chevy Trailblazer and GMC Envoy owners and enthusiasts. Common Symptoms Of A P0440 Trouble Code A P0440 will cause the vehicle to fail an emissions test. I use a Snap On Solus to evaluate the evap system and. https://onlineautorepairvideos. P0440 Indicates that something is wrong with the EVAP system. The P0440 code indicates that there is a large leak in the EVAP system, but this is somewhat misleading. If you have already changed the gas cap then assuming it was a good quality one then we should be able to rule that one out. Have a 2002 GMC envoy keeps giving me code p0440 changed the. GMC Envoy P0440: Evaporative Emission Control System. 00 which includes the EVAP part which if you buy at their parts dept. I reset it from time to time only to have it return a few days later ( sometimes maybe a week). P0446 Indicates that there is a fault in the evaporative emission control system. Have a 2002 GMC envoy keeps giving me code p0440 changed the gas cap and the charcoal canister what can i do next - Answered by a verified GMC Mechanic. Diagnosing and fixing p0440 Check Engine Light Chevy. Here are some things to try: Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back. The SLE features 17-inch alloy wheels, dual-zone air-conditioning, a CD player,. The EVAP leak detection generally concerns the fuel tank to carbon cannister plumbing. Due to the location above the liquid fuel level, this small fracture will not cause a visible fluid leak. 5K 129K views 5 years ago For MORE great Auto Repair Videos, visit us. not factory/original brand) A small leak/hole in a fuel vapor hose/tube Other small leak in EVAP system Faulty vent o-ring seal Possible Solutions. Bad mode door actuator : GMC Envoy Heating and Air Conditioning. 7M Mar 22, 2023 TrailBlazer SS Chat The TrailBlazer SS Owners and Enthusiast lounge. 2003 GMC Envoy SLE XL 6cyl 4. Loose fuel tank filler cap is the most common cause that triggers the P0440. OBD2 Code P0442 GM definition: This indicates a fuel vapor leak in the EVAP control system. User Submitted Video What is the Cost to Diagnose the Code P0440 GMC? Labor: 1. Code">2003 GMC Envoy SLE XL 6cyl 4. com TrailBlazer SS and GMC Envoy Forum. 2003 GMC Envoy has a problem with the gas tank. 00 and my dealership parts man told me they sell one a day!. hello have a 2002 GMC envoy keeps giving me code p0440 changed the gas cap and the charcoal canister what can i do next Answered in 1 hour by: GMC Mechanic: Pete Hello,I will be glad to try and assist you with this,Welcome to Just Answer. This code has a real common problem of the fuel fill cap either loose or the seal or check valve bad in the cap. P0449 indicates that the valve or solenoid circuit that controls the evaporation system is not functioning properly. P0480 Definition: Cooling Fan 1 – Control Circuit Malfunction. The P0440 code indicates that there is a large leak in the EVAP system, but this is somewhat misleading. But most common is fuel cap loose or bad. Video on diagnosing and repairing code p0440 which is an Evaporative Emission Control System Malfunction on a 2002 - 2004 GMC Envoy with the 4. 346 115K views 6 years ago patient is a 2002 Trailblazer 4. It means a very small leak has been detected. Seller: Driven by two owners only. This can happen for multiple reasons and a mechanic needs to diagnose. experience as repair shop manager and technician. GMC Envoy P0480: Meaning, Causes & Diagnosis. A P0440: Evaporative Emission Control System Malfunction means that there's a fuel vapor leak somewhere in the EVAP system. Potential Causes: Filler Neck Fuel Tank. P0440 definition: Evaporative Emission Control System Malfunction Issue Severity: LOW – Continued driving for a short period of time is okay Repair Urgency: Get this fixed within the next month to prevent poor emissions and potential emission system damage.