2018 traverse 3.6 awd 110k miles sometimes hard start after refueling. Recently shaking at idle sometimes dying. After doing Google search I thought evap solenoid by throttle body was stuck open. Replaced valve but codes that reappeared are P0442 p0455 p0449 p0171. With a lean code p0171 and solenoid replaced I …The first step to decoding the Chevy engine block code is to locate and identify the code on the engine assembly stamp correctly. Next understand the block code. The code has 15 ch...P0442 Code Chevy Silverado Diagnosis and Troubleshooting | Drivetrain. Check Details. P0496 code chevy silverado. Chevy truck hard to fill gas tank gm evap codes p0442, p0446, p0455 orSilverado evap leak code / p0455 major emissions leak code chevrolet P0442 chevy suburban code 2007Silverado chevy code …Code P0442 2018 Chevrolet Silverado Tech Notes. The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). A loose fuel tank filler cap is the most common cause that will trigger the P0442 code. There is a factory service bulletin for all the models from 2000 through 2021.Check engine light code P0449 means Evaporative System (EVAP) Vent Control Circuit Malfunction. ... Popular Engine Codes P0420 P0172 P00171 P0128 P0300 P0456 P0430 P0442 P0455 P0113. Fixed It But The Check Engine Light Is Still On? ... Chevrolet Tahoe vs. GMC Yukon | The Best Model Year For …If your GMC Acadia has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the GMC Acadia is the P0442 trouble code. This code appears when connecting the vehicle to an …Fix code p0441 p0442 engine light on chevy, chevrolet, gmc, buickP0455 or p0442 code Evap code p04422004 chevy silverado, code p0446: (evap) vent control circuit. Check Details. P0442 code chevy silverado: know all …The P1516 code in Chevy usually relates to the issues with the TAC system. When the P1516 DTC is triggered, it typically points to a fault within the TAC system, affecting the electronic throttle body’s operation. The electronic throttle control system plays a crucial role in regulating the engine’s air intake and improving overall performance.Chevy Express P0442 Code Symptoms. There are rarely any symptoms related to the P0442 code. You may notice the vague smell of gas near the back of your vehicle, the check engine light will illuminate, and you may or may not have a “ check fuel cap message ”. In rare cases, your Express may have difficulty starting after fueling up ...It started off with the 'Tighten gas cap' message, and began throwing P0422 (EVAP small leak) and then P0455. I've also had an occasional P0014 (Bank 1/B camshaft over advanced) code which I think is unrelated... www.impalaforums.com. If you aren't getting tank pressure readings like the above thread then the tank pressure sensor has …This is my luck seeing as it's time for a new tag. I tried making sure the gas cap was tight and clearing the code. It came back on after a ...According to the GM service bulletin, in some 2011-2013 Chevy, Buick and Cadillac vehicles the code P0442 might be caused by the leaking EVAP Vent Solenoid (CVS). The vent solenoid must be tested under vacuum …Jun 27, 2022 · The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP) system of your Chevrolet. It can be caused by a loose fuel tank filler cap, a leaking EVAP canister, a leaking EVAP hose, or a leaking fuel tank. See the possible causes, symptoms, diagnosis, and cost to fix the P0442 code. P0442 Code Chevy Silverado Diagnosis and Troubleshooting | Drivetrain. Check Details. P0496 code chevy silverado. Chevy truck hard to fill gas tank gm evap codes p0442, p0446, p0455 orSilverado evap leak code / p0455 major emissions leak code chevrolet P0442 chevy suburban code 2007Silverado chevy code …Have a code scanner at home and wasn't far away so brought it on home. It gave P0442....Evaporative Emission Control System Leak Detected (small leak). Before we even pulled the code I checked the gas cap and it was on tightly. However, this is an aftermarket replacement cap bought a few years ago after the …The P0496 code indicates that there’s an incorrect amount of intake vacuum flow occurring in the car’s EVAP system. Any time this vacuum is higher than what the computer determines is appropriate, the codes will be set. While this code can occur with all brands, it appears to be most common with GM vehicles.Apr 9, 2020 · The p0442 code listed in the Chevy Silverado will indicate an EVAP system leak has been detected. This is one of the most common fault codes and it typically can be the result f a loose or damaged fuel cap. This will be the first thing to inspect to see if this could be the cause. There can also be other issues with the truck such as a bad ... Nov 14, 2017 ... Chevy Impala 9th Gen Discussion. Posted by cbsaf Updated Dec 9, 2019 · 2015 Impala LT V6 code P0442. Need vapor canister help please. 27 ...Sep 12, 2023 · How to fix a Chevy or GMC P0442 Code: Evaporative Emission System Small Leak DetectedAmazon Link to Smoke Machine: https://amzn.to/41U0DifHow to Test a Purge... Ltaylor0916. 3 posts · Joined 2014. #8 · Nov 7, 2014. Sorry to bring up an old topic, however my truck is giving the PO442 code. I have replaced the purge valve, vent valve, and replaced the gas cap with one from the dealership. The code goes off for a few days and then eventually comes back on.The p0442 code listed in the Chevy Silverado will indicate an EVAP system leak has been detected. This is one of the most common fault codes and it typically can be the result f a loose or damaged fuel cap. This will be the first thing to inspect to see if this could be the cause. There can also be other issues with the truck such as a bad vapor …Jul 9, 2015 ... Just a quick tip of where to look first and possible quick fix if you have a Chevy S10 or Blazer with an EVAP P0442 small leak code.Jul 7, 2020 ... Remove and re-seat your fuel cap. A loose gas cap can cause this code. (It will take a few days for the CEL to self-extinguish if you don't ...The P0442 code is the trouble code for the “small EVAP system leak.”. At engine start, your ECU runs a test for large and small holes in the evaporative emissions system. It does this by pressurizing the system and then looking for any drops in vacuum pressure. The tests are often so sensitive that even holes smaller than half an inch are ...To add coolant to a Chevy Malibu, dilute the coolant with equal parts coolant and water, then pour the coolant-water mixture into the vehicle’s coolant reservoir. The coolant reser...Likes: 312. Received 394 Likes on 247 Posts. check engine - code P0442. Today, out of the blue, the check engine light came on. I pulled all of the codes. The only active one was 10 PCM P0442 C H. I checked the list and it means "Evaporative Emission (EVAP) System Small Leak Detected". I cleared the code. …FIX CODE P0441 P0442 ENGINE LIGHT ON CHEVY, CHEVROLET, GMC, BUICK, CADILLAC Great Car Scanner: https://amzn.to/2QmNBri Check out our Amazon Store for the t...When the Chevy Monte Carlo’s computer detects that the EVAP system has a leak, it will throw the P0442 code. Different code numbers represent the leak size. P0442 indicates your Monte Carlo has a minor EVAP leak.Jul 29, 2018 · Conclusion. If your Chevy Colorado has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Colorado is the P0442 trouble code. This code appears when connecting the ... I have a 2019 chevy equinox with the check engine light on and thisP0010 p0011 chevy equinox 2010 chevy equinox ls 2.4l (engine power reduced) codes: p228d …Diagnostic trouble code (DTC) P0442 stands for “Evaporative Emission Control System Leak Detected (Small Leak)”. Your car’s computer will set the code when it determines there’s a minor leak …If your Chevy Camaro has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Camaro is the P0442 trouble code. This code appears when connecting the vehicle to …Code P0442 Chevrolet Tech Notes. The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). A loose fuel tank filler cap is …Unfortunately, when this code appears by itself, it doesn’t specify which part of the EVAP system the leak is coming from. A professional shop can use a smoke machine to test precisely where your Cavalier’s EVAP system is leaking from. Purge Valve. The vapor canister purge valve is a common cause of the P0442 trouble code and the Chevy ...Feb 7, 2013 ... Drove it today and the smell has gone. I did get a P0442 code today, Evaporative Emission Control System Leak Detected (small leak). I purchased ...So got a 2004 Chevy trailblazer 4.2 v6 and we have the infamous p0442 which is small Evap leak detected and we know it’s not a gas cap issue because we had s... So got a 2004 Chevy trailblazer 4 ...- Silicone paste → https://amzn.to/47g1psq The most common check engine light cause is an EVAP leak. As a professional mechanic of more than 30 years I've ...According to the GM service bulletin, in some 2011-2013 Chevy, Buick and Cadillac vehicles the code P0442 might be caused by the leaking EVAP Vent Solenoid (CVS). The vent solenoid must be tested under vacuum …Feb 23, 2013 ... My Error It's CODE PO442 Help · 1. Defective or Loose Fuel Cap · 2. EVAP cannister or hose cracked or not connected · 3. Purge or vent sol...What is the cost to resolve a P0442 code? Estimated diagnostic cost: $100–$200. Estimated part (s) + labor cost: $50. The diagnosis might be the most expensive part of the bill. Unlike larger leaks, where components have failed or hoses have broken in half, small leaks are much harder to find. An initial diagnostic fee of $100 is customary ...Jul 6, 2018 · If your Chevy Avalanche has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Avalanche is the P0442 trouble code. This code appears when connecting the vehicle to an ... I have a 2015 Impala LT V6. I have about 45K miles on the car. About a month ago the check engine light came on and a scan revealed code P0442, small evap system leak. I tightened the gas cap, reset the light, and soon it came back. I replaced the gas cap, reset the light, and soon it came back. I'm about to replace the purge valve and …I have a perennial P0442 code that has been nagging me and the dealership (and a whole parade of mechanics for years now). ... Ensure your Chevy Suburban's fuel tank is between 1/4 and 3/4 full. Engine coolant temperature must be below 122°F and within 11°F of the ambient air temperature. Do not leave the key …The P0442 is a common trouble code in the Chevy Traverse and arises when the computer detects a leak in the EVAP system. It is important that you have this checked as soon as you can since ignoring it can lead to future issues. Related Posts. P1682 Chevy Traverse: Symptoms & Causes;Jul 29, 2018 · If your Chevy Impala has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Impala is the P0442 trouble code. This code appears when connecting the vehicle to an OBDII ... Code P0446 sometimes indicates that an electrical failure has been detected in either the vent valve itself or its control circuit. While the P0446 can indicate an electrical problem on later model Fords, which, for some strange reason chooses to look at the vent valve electrical circuit to set this code, the P0446 code is highly unlikely to be ...Check engine light code P0449 means Evaporative System (EVAP) Vent Control Circuit Malfunction. ... Popular Engine Codes P0420 P0172 P00171 P0128 P0300 P0456 P0430 P0442 P0455 P0113. Fixed It But The Check Engine Light Is Still On? ... Chevrolet Tahoe vs. GMC Yukon | The Best Model Year For …What Does the P0442 Code Mean? The PO442 indicates that there’s a small leak in the EVAP system. When the vehicle engine is turned off, the Electronic Control Unit (ECM) carries out a leak test to double-check that the evaporative emission control system is functioning correctly. In this test, the ECM seals the EVAP system.Jul 28, 2018 · The vapor canister purge valve is a common cause of the P0442 trouble code and the Chevy Trailblazer. The purge valve lets fuel vapor out of the charcoal canister and into the intake manifold. They are easy to replace. There are a few clips that you need to find and remove. It started off with the 'Tighten gas cap' message, and began throwing P0422 (EVAP small leak) and then P0455. I've also had an occasional P0014 (Bank 1/B camshaft over advanced) code which I think is unrelated... www.impalaforums.com. If you aren't getting tank pressure readings like the above thread then the tank pressure sensor has …For DTC P0442 (small leak detected), the vehicle will set this code due to small leak. The leak can occur from. a stuck open purge valve or stuck open canister vent valve. In addition, the DTC could set due to an unsealed EVAP system, so verifying all purge lines are properly connected should be confirmed. For either DTC P0442 or P0445, it is ...Unfortunately, when this code appears by itself, it doesn’t specify which part of the EVAP system the leak is coming from. A professional shop can use a smoke machine to test precisely where your Cavalier’s EVAP system is leaking from. Purge Valve. The vapor canister purge valve is a common cause of the P0442 trouble code and the Chevy ...P0442 Code: EVAP System Leak Detected (Small Leak) P0440 Code: Evaporative Emission Control System Malfunction; Categories: OBD Codes. Related Posts. P0496 – EVAP Flow During A Non-Purge Condition. P0440 Code – Meaning, Symptoms, Causes (& How to Fix it) P1450 Code – Meaning, Causes and Diagnosis.Jun 3, 2018 ... In this video we have a look at a 2002 Chevrolet 1500 5.3 4x4 that came in with codes, P0440, P0442, P0449, P0453 indicating a problem in ...If you’re in the market for a used SUV, a Chevy Blazer is definitely worth considering. Known for its reliability, versatility, and stylish design, the Chevy Blazer has been a popu...There are two very common, very easy fixes to solve a P0442 Engine Code: Changing the Canister Vent Solenoid and changing the Purge Valve Solenoid. In this...The P0442 code indicates a fault with the EVAP system, specifically a small leak. This system is designed to stop fuel vapor pollution (HydroCarbons) from entering …I have a 2019 chevy equinox with the check engine light on and thisP0010 p0011 chevy equinox 2010 chevy equinox ls 2.4l (engine power reduced) codes: p228d …2010 Chevy Malibu LTZ P0442 Code. Hey guys, My Chevy Malibu's check engine light came on in August. When I checked with the OBD2 machine, it showed me P0442 (Evaporative Emission System, Leak Detected (Small Leak). So I put a new original Chevy gas cap on it just to be sure that it was not related to the gas cap.If your Chevy Aveo has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Aveo is the P0442 trouble code. This code appears when connecting the vehicle to an OBDII ...Jan 7, 2023 · The P0496 code indicates that there’s an incorrect amount of intake vacuum flow occurring in the car’s EVAP system. Any time this vacuum is higher than what the computer determines is appropriate, the codes will be set. While this code can occur with all brands, it appears to be most common with GM vehicles. How to fix Code P0449 EVAP Vent Solenoid on GM vehicles, Silverado , Tahoe, Suburban, Yukon! Make sure that you use quality parts and tools!!!!I hope this vi...Jul 28, 2018 · Chevy Express P0442 Code Symptoms. There are rarely any symptoms related to the P0442 code. You may notice the vague smell of gas near the back of your vehicle, the check engine light will illuminate, and you may or may not have a “ check fuel cap message ”. In rare cases, your Express may have difficulty starting after fueling up ... This is my luck seeing as it's time for a new tag. I tried making sure the gas cap was tight and clearing the code. It came back on after a ...In this video, we go over how to change the Vapor Canister Purge Solenoid Valve on a 2015 Chevy Cruze. This is the main cuprit for the P0442 check engine cod...So got a 2004 Chevy trailblazer 4.2 v6 and we have the infamous p0442 which is small Evap leak detected and we know it’s not a gas cap issue because we had s... So got a 2004 Chevy trailblazer 4 ...Deputy347k9 Discussion starter. 211 posts · Joined 2020. #4 · Apr 1, 2023. After securing the gas tank vent line, so it’s not leaking, I erased the P0442 code last evening. Drove about 60 miles today, no engine light, fingers crossed. Still going to replace the gas cap as it looks like it might be on it’s last leg!Jul 29, 2018 · Conclusion. If your Chevy Colorado has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Colorado is the P0442 trouble code. This code appears when connecting the ... A large leak diagnostic trouble code is related to, and could also cause, these additional trouble codes: P0440; P0441; P0442; P0444; P0445; And more; Many of these EVAP trouble codes are from a series of sensors that measure different areas for air leaks. A major leak could affect more than one area, causing multiple trouble codes. In this video I bring you along as I diagnose the EVAP system on this 2007 Chevrolet Silverado Classic 1500. A couple of quick tests and we have the problem ...P0442 Code: EVAP System Leak Detected (Small Leak) P0440 Code: Evaporative Emission Control System Malfunction; Categories: OBD Codes. Related Posts. P0496 – EVAP Flow During A Non-Purge Condition. P0440 Code – Meaning, Symptoms, Causes (& How to Fix it) P1450 Code – Meaning, Causes and Diagnosis.Check engine light code P0496 means EVAP Flow During a Non-Purge Condition. Find out how to fix it in this article! ... Popular Engine Codes P0420 P0172 P00171 P0128 P0300 P0456 P0430 P0442 P0455 P0113. ... Chevrolet Camaro vs. Ford Mustang | The Best Model Year For Every Budget Nissan Altima …Mar 26, 2017 ... Google search implies that there's a small leak in the evaporative system because it can't hold a vacuum for a set amount of time. Check the ...A popular car modification is the stereo system. Replacing the stereo enables the car owner to add an aftermarket stereo with a number of features such as MP3 players, Bluetooth co...The 2020 Chevrolet Silverado is a fabulous choice if you’re searching for a reliable full-size pickup truck. Why? Because the Silverado is ranked in third place on the US News site...To add coolant to a Chevy Malibu, dilute the coolant with equal parts coolant and water, then pour the coolant-water mixture into the vehicle’s coolant reservoir. The coolant reser...Mar 26, 2017 ... Google search implies that there's a small leak in the evaporative system because it can't hold a vacuum for a set amount of time. Check the ...Ltaylor0916. 3 posts · Joined 2014. #8 · Nov 7, 2014. Sorry to bring up an old topic, however my truck is giving the PO442 code. I have replaced the purge valve, vent valve, and replaced the gas cap with one from the dealership. The code goes off for a few days and then eventually comes back on.Jul 14, 2018 · Chevy Cruze P0442 Code Symptoms. There are rarely any symptoms related to the P0442 code. You may notice the vague smell of gas near the back of your vehicle, the check engine light will illuminate, and you may or may not have a “ check fuel cap message ”. In rare cases, your Cruze may have difficulty starting after fueling up, indicating ... Aug 2, 2018 · If your Chevy Corvette has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Corvette is the P0442 trouble code. This code appears when connecting the vehicle to an ... Aug 2, 2018 · If your Chevy Corvette has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Corvette is the P0442 trouble code. This code appears when connecting the vehicle to an ... Deputy347k9 Discussion starter. 211 posts · Joined 2020. #4 · Apr 1, 2023. After securing the gas tank vent line, so it’s not leaking, I erased the P0442 code last evening. Drove about 60 miles today, no engine light, fingers crossed. Still going to replace the gas cap as it looks like it might be on it’s last leg!Jul 31, 2008 ... It came up as a P0442 evap control system leak small. Theautozone guy said the most likely cause is a faulty gas cap. So i bought a new one for ...A popular car modification is the stereo system. Replacing the stereo enables the car owner to add an aftermarket stereo with a number of features such as MP3 players, Bluetooth co...P0443 code: evaporative emission system purge control valve "a" circuitP0134 code chevy silverado. 4 causes and fixes p0449 chevy silverado or gmc sierra – backyardmechanicP0443 code: evaporative emission system purge control valve "a" circuit Silverado chevy code p0442 p0171 p0121 p0304 misfire …
Likes: 312. Received 394 Likes on 247 Posts. check engine - code P0442. Today, out of the blue, the check engine light came on. I pulled all of the codes. The only active one was 10 PCM P0442 C H. I checked the list and it means "Evaporative Emission (EVAP) System Small Leak Detected". I cleared the code. …. Minimalist logos
This page is meant to help you troubleshoot the Chevy Express P0420 trouble code. It covers the P0420 code’s meaning, symptoms, causes, and possible solutions. ... Related: P0442 Chevy Express. P0420 Causes . Here are the most common causes of P0420 in the Chevy Express: Likely Causes. Bad catalytic converter; Bad O2 …Jul 28, 2018 · The vapor canister purge valve is a common cause of the P0442 trouble code and the Chevy Trailblazer. The purge valve lets fuel vapor out of the charcoal canister and into the intake manifold. They are easy to replace. There are a few clips that you need to find and remove. Unfortunately, when this code appears by itself, it doesn’t specify which part of the EVAP system the leak is coming from. A professional shop can use a smoke machine to test precisely where your Cavalier’s EVAP system is leaking from. Purge Valve. The vapor canister purge valve is a common cause of the P0442 trouble code and the Chevy ...The P0440 code indicates that there is a leak or malfunction in the EVAP emissions system. 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. If there is a leak in the lines between the gas tank and the engine, or if the lines are ...It started off with the 'Tighten gas cap' message, and began throwing P0422 (EVAP small leak) and then P0455. I've also had an occasional P0014 (Bank 1/B camshaft over advanced) code which I think is unrelated... www.impalaforums.com. If you aren't getting tank pressure readings like the above thread then the tank pressure sensor has …2018 traverse 3.6 awd 110k miles sometimes hard start after refueling. Recently shaking at idle sometimes dying. After doing Google search I thought evap solenoid by throttle body was stuck open. Replaced valve but codes that reappeared are P0442 p0455 p0449 p0171. With a lean code p0171 and solenoid replaced I …Jan 31, 2011 ... P0442 Code ... Evap system leak? ... yea that's what the scanner said. but reading on this forum it seems to be a bad gas cap, that's why i bought ...2007 chevy tahoe 5.3l codes p0442, po455, po496. not sure what to doTrouble codes p0442 & p0446 and fuel filler issues on our 2005 chevy Engine code p evap canister purge control valve chevyChevy silverado code p0442. Sparky's answersCheck engine code p0442 Code p0442 small leak purge solenoid???Tahoe …JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals. I have a 2013 Chevy Cruze with a P0442 code The print out provided to me states 4 probable components to address: 1. Gas - Answered by a verified Chevy Mechanic.Jul 29, 2018 · If your Chevy Impala has the P0442 OBD II code, you should first check the fuel cap. If it’s missing or broken, replace it. If the fuel cap seems ok, you must check the EVAP system for a leak. One of the most common issues that happens with the Chevy Impala is the P0442 trouble code. This code appears when connecting the vehicle to an OBDII ... The P0442 code is a diagnostic trouble code that your PCM logs when there is a fault in the EVAP system. There are a few other EVAP system codes. A P0442 code is a specific indication that there is a small leak. Larger, more severe leaks will trip a different code and require a different approach to troubleshooting.He said that it was something that he heard might help with a P0442 problem. The cap with 7% sales tax cost $32.41. I put it in on. I then took my newest code reader, an ACTRON PocketScan Plus to erase the codes. I've had a P0442 set and a P0442 pending. I can't seem to clear them!Mar 3, 2022 · P0442 Causes. There are many potential causes of diagnostic trouble code P0442. Loose or damaged gas cap. Leaking or disconnected EVAP hose. Faulty purge volume control valve. Faulty canister vent control valve. Charcoal canister leak. Leaking fuel tank. Jul 28, 2018 · Chevy Express P0442 Code Symptoms. There are rarely any symptoms related to the P0442 code. You may notice the vague smell of gas near the back of your vehicle, the check engine light will illuminate, and you may or may not have a “ check fuel cap message ”. In rare cases, your Express may have difficulty starting after fueling up ... Auto Tech. Vocational, Technical or Tra... 25,980 satisfied customers. Chevrolet Uplander LT: i have a whole list of fault codes i. i have a whole list of fault codes i need diagnosed: P0120 P0220 P0405 P0442 …Apr 15, 2022 ... Comments28 ; How To Fix P0442 Engine Code - Chevy Silverado - Part 2. Cars, Crafts, & Drafts · 75K views ; P0442 Where Leaks Happen & Easy Common&nb...P0449 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. While the issue can cause some performance issues from AFR’s, it is usually not serious enough to cause major engine … P0442 Diagnostic Theory for Shops and Technicians. The P0442 code indicates that there is a small leak in the EVAP system, but this is somewhat misleading. What the code really indicates is that the EVAP system will not hold a specified level of vacuum for a specified amount of time when it performs its leak test. .