Code p0420 chevy equinox

Chevy Traverse. Tech Section. Engine/Drivetrain The Dreaded P0420. Jump ... Malibu and Equinox forum contributor '20 High Country Silver Ice Met.-'16 Equinox 3.6 AWD LTZ -'23 Silverado 6.2 LTZ-Ski Doo's-FLHR-F3S Spyder-Boats. ... So i have resolved the P0420 with the O2 sensors. when the codes cleared, they never came …

Make sure the camshaft timing is correct. If the timing is off, it can cause the P0016 code to be triggered. 5. Replace any worn or damaged components in the timing system, such as the timing chain, tensioner, or other related parts. 6. If the engine is overheating, it can cause the P0016 code to be triggered.Before you fix P0420, make sure you correctly diagnose the cause of the code first. If you don’t, you could end up spending $1000s buying a new catalytic converter when that wasn’t the cause of the code. Below are some of the main causes of a P0420 code. Click on sections below to learn more about each repair. Conclusion. P0506 is a serious issue. Due to the unsafe nature of driving with an engine that can stall at any time, we recommend having your Equinox serviced as soon as possible. Good luck! P0506 is a common OBDII trouble code. It is typically triggered when the engine idle speed is lower than the predetermined limit set by the manufacturer ...Apr 19, 2018 · Diagnosing P0420 and P0171. Hey everyone! My very first post! Greetings all. I'll just jump right in, I just bought a 2014 Equinox LT AWD about 6 months ago. My check engine light came on so I decided to get a OBD II device and check what could be wrong. It threw the P0171 (Lean Engine) and P0420 (Catalyst efficiency below threshold) codes both. My 2014 Chevy equinox is throwing codes P0014, P0016, P0017. We changed both camshaft solenoids (intake and exhaust) replaced broken guides, new spark plugs, new gaskets, and fresh oil. ... equinox 2.4l just got a engine put in and i have all these codes coming up now C027b C0800 C1100 U0100 C0040 P0089 P0420 P0010 …P0017 on Chevy vehicles translates to Crankshaft Position – Exhaust Camshaft Position Not Plausible. Despite the varying names given by respective manufacturers, P0017 code simply means that the PCM believes the difference between the crankshaft position and the camshaft position exceeds specification.Chevy equinox 2011: code p0420. americanfoxusa. Dec 16, 2018. Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission. Dec 16, 2018. #1. A.Chevy Traverse. Tech Section. Engine/Drivetrain The Dreaded P0420. Jump ... Malibu and Equinox forum contributor '20 High Country Silver Ice Met.-'16 Equinox 3.6 AWD LTZ -'23 Silverado 6.2 LTZ-Ski Doo's-FLHR-F3S Spyder-Boats. ... So i have resolved the P0420 with the O2 sensors. when the codes cleared, they never came …

The enigmatic P0420 code twirls through the veins of every Chevy Equinox owner's nightmare. Like a cryptic riddle, it challenges our automotive prowess. Perplexed, we unravel the mysteries behind this Chevy enigma, delving into the heart of the Equinox's exhaust system. Join us on this quest as we decipher the riddles of the P0420 code and …P0420 is a diagnostic trouble code (DTC) for "Catalyst System Efficiency Below Threshold (Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic ...The enigmatic P0420 code has befuddled many Chevy Equinox owners, leaving them scratching their heads in disbelief. In this article, we will unravel the mysteries behind this elusive code, exploring its causes, potential fixes, and ultimately providing clarity for those lost in the sea of automotive confusion. Stay tuned for an enlightening journey into the …Saturday at 4:39 PM. 3rd Gen : 2018+ Current Chevy Equinox. 2nd Gen : 2010-2017 Chevy Equinox. ok i have the 2013 equinox nd i get the p0420 code all day long. i know why because the engine burned so much oil i had to have a refinery in the backyard to keep up. anyway because we do not live in a test state i drilled out the cat so the engine ...Multiple codes, diagnosis in different directions, sad ending.Have a P0420 code on a 2010 equinox 2.4l 4cyl. Just measured back pressure at at upstream sensor port it appears OK--at idle its around 1.25psi -1.5psi and when at 2000-2500 rpm it stays at the same reading. Is it possibly the dow... Have a P0420 code on a 2010 equinox 2.4l 4cyl.

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 ...Before you fix P0420, make sure you correctly diagnose the cause of the code first. If you don’t, you could end up spending $1000s buying a new catalytic converter when that wasn’t the cause of the code. Below are some of the main causes of a P0420 code. Click on sections below to learn more about each repair. What Does Chevrolet Malibu Code P0420 Mean? Chevrolet Malibu P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid further damage to your emission system and …Dec 16, 2013 · We have a 2010 Equinox 3.0 with ~65,000miles on it. Recently the CEL came on so I had the codes checked and was told it's a P0017 (CKP/CMP timing misalignment-ECM detected the crank sensor is not aligned with the cam sensor.) and a P0420 (Catalyst efficiency low-bank 1.) Was also told the P0017 probably caused the triggering of the P0420. Saturday at 4:39 PM. 3rd Gen : 2018+ Current Chevy Equinox. 2nd Gen : 2010-2017 Chevy Equinox. ok i have the 2013 equinox nd i get the p0420 code all day long. i know why because the engine burned so much oil i had to have a refinery in the backyard to keep up. anyway because we do not live in a test state i drilled out the cat so the engine ...What Does Code P0420 Mean? OBD II fault code P0420 is a generic code that is defined as “Catalyst System Efficiency Below Threshold (Bank 1)”, and is set when the PCM (Powertrain Control Module) detects a condition that indicates that the catalytic converter on Bank 1 is operating below the minimum allowable efficiency threshold. Note …

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Step 1 – Resolve Engine Trouble Codes. The first step is to resolve any other codes that may have come up in addition to the P0420; especially troublesome is the P0300 series of cylinder misfire codes. A P0300 code could be related to something in the ignition (spark plug or coil), the fuel injector, compression or fuel contamination.The P0420 code went away, but comes back periodically after I clear it and I have the P0013 and P0014 codes all the time. ... the car having any trouble driving but it does burn oil which is apparently a common issue with the engine in the Equinox. ... With that information coupled with the fact that Chevy did nothing more than plug in a code ...My 2014 Chevrolet Equinox keeps showing P0420 Code My car was brought to dealership for fixing and they charged me 1400.00 for a manifold when I …You may ever experience troubleshooting, such as P0420 Chevy equinox. It happens after your car is connected to the scanner. The code appears to indicate there …

How to diagnose, repair, and info on symptoms and causes of a P0420 OBD-II trouble code which means the catalytic converter is no longer performing at a normal level. Often this means the bank 1 converter will need to be replaced. Search. ... 2010 Chevy Traverse P0420 code I have a 2010 Chevy Traverse with approx. 150000 miles on it. About a ...============================Claim your FREE engine code eraser 👉 https://free.nonda.co 👈============================Engine Code P0420 Saving Repair Parts:C...The CEL lit up a few weeks ago with the first code, P0420, the Catalytic Converter Bank 1 was below the efficiency threshold. ... Build Date: 4-11-2019 - Bought 6-22-2019 SOLD - - 2015 Equinox LTZ 3.6L FWD Champagne Silver Metallic *Build Date 1-08-2015 * SOLD with ... Chevy Equinox, and Cadillac SRX owners and enthusiasts. Come …See Part_2 for loose timing chain. https://youtu.be/Xa09SV8tprQFor Buick Regal 2012-2013, 2015-2017For Buick Verano 2012-2017For Chevrolet Captiva Sport 2012...P0191 Chevy Equinox code meaning. If you’re a Chevy Equinox owner and have been getting the P0191 code, don’t worry, you’re not alone. The P0191 Chevy Equinox OBD-II code is a common one and usually indicates a fuel rail pressure sensor issue. In this post, we’ll go over what the P0191 code means, what causes it, and how to fix it. The chart below shows the most likely repair and cost range for Equinoxs for all of the years that FIXD has data on. See moreP0411 is a general OBDII trouble code, which means that it has the same meaning for the Chevy Equinox as it would any other car or truck. By definition, the code is letting you know that the ECM has …How to diagnose code P0420 Here’s a quick rundown of how to troubleshoot and diagnose the P0420 engine code: First off, make sure that P0420 is the only engine code present. Clear the code and drive for approximately 15 minutes. Check to see if the code is returned. If not, repeat the process a few times to be sure.Here is a tutorial on P0420 code fix catalyst efficiency below threshold How To Diagnose a p0420 code. p0420 Code Fix how to diagnose and fix a Catalytic Co...Apr 2, 2018 · 2011 Equinox 2.4L P0420 DIY Cat replacement. 2011 Equinox 2.4L is throwing code P0420 repeatedly. Runs fine and no other codes. New o2 sensors. Has 185,000 miles on it and now on engine #3 so its time to replace. Those engines have burned a lot of oil as we all know and i'm sure the cat is coked up with junk. Need help on a 2011 Chevy equinox LT, has a code of: P0420. Hi, need help on a 2011 Chevy equinox LT, has a code of: P0420. If i clear it out , It comes back before starting the car again.

Chevrolet Equinox P0016 definition: The correlation of the camshaft and crankshaft positions on bank 1 is incorrect based on the intake camshaft position sensor. Repair Urgency: Fix this code immediately (same day if possible) to avoid internal engine damage. Diagnosis: This trouble code can cause the vehicle to be hard to start and run …

16 years of experience. The code P0420 for your 2.4 L engine is for the after the catalyst O2 sensor. Your vehicle has only two O2 sensors. One is in manifold before …2011 Chevy Cruze LT 1.4. Have a P0420 and no other codes. Replaced plugs (looked to be a good burn), checked PCV system, changed oxygen sensors and replaced catalytic converters with aftermarket ones. PCV hose from turbo housing to intake was found to be bad as the check valve was not seating properly. Replaced.I am working on a 2011 Chevy Equinox. I overhauled the engine. After I got it back together, it runs just fine but when it runs, but after the codes P228D, P0089, P0420 and P0271 all come up, the engi … read moreJun 20, 2022 · Code P0420 Chevrolet Tech Notes. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (it is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the catalytic ... Jan 24, 2023 · These are the 5 most Chevy Equinox Check Engine Light Codes: ... P0420: MODERATE– Extended driving with this code can cause internal engine damage: Apr 19, 2018 · Diagnosing P0420 and P0171. Hey everyone! My very first post! Greetings all. I'll just jump right in, I just bought a 2014 Equinox LT AWD about 6 months ago. My check engine light came on so I decided to get a OBD II device and check what could be wrong. It threw the P0171 (Lean Engine) and P0420 (Catalyst efficiency below threshold) codes both. Short fuel trim is the immediate response of the ECM/PCM to rich and lean conditions reported by the O2 sensor. A Closer Look at Fuel Trim. Fuel trim isn’t something that can be read with an oscilloscope or meter – it must be reported to a scan tool by way of the datastream.Short fuel trim is the immediate response of the ECM/PCM to rich and …

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SOURCE: engine code p0420 on 2002 Chevrolet Express Van V8. Hello! the code you speak of relates strictly to the catalytic converter. it is possible there is a faulty sensor, however that choice is highly unlikely.Saturday at 4:39 PM. 3rd Gen : 2018+ Current Chevy Equinox. 2nd Gen : 2010-2017 Chevy Equinox. ok i have the 2013 equinox nd i get the p0420 code all day long. i know why because the engine burned so much oil i had to have a refinery in the backyard to keep up. anyway because we do not live in a test state i drilled out the cat so the engine ...Replied by Tyler on topic Chevrolet Equinox Set A Code p228D and p0089 Reduced Engine Power I like pole71's suggestion to investigate the rail pressure sensor. A quick check is to run the low …I have a 2012 Chevy Equinox with codes PO300, ... Need help on a 2011 Chevy equinox LT, has a code of: P0420. Hi, need help on a 2011 Chevy equinox LT, has a code of: P0420. If i clear it out , It comes back before starting the car again. Bad O2 Sensor? Thanks in advance, ...FIX CODE P0420 ON CHEVROLET CRUZE, CHEVY SONIC Catalyst System Efficiency Below ThresholdIf you have engine light on and code such as P0420 we will explain ...2012 Chevy equinox 2.4L at about 135K miles threw a fan belt about 6 months ago on a road trip. Limped it to a dealership for fanbelt replacement and they said the timing chain was making a lot of noise and need replaced too. So I got it back home and had a shop do the timing chain with new tensioners and guide vanes as well as new water pump.2014 Chevy Equinox P0420. Thread starter possum328; Start date Sep 8, 2023; 1; 2; Next. 1 of 2 Go to page. Go. Next Last. P. possum328. Joined Feb 1, 2012 ... Was near an Oreilly’s and stopped in to have the code read. Got the P0420 cat related code. Could that have any correlation with the solenoid replacements or are the two …Jan 24, 2023 · These are the 5 most Chevy Equinox Check Engine Light Codes: ... P0420: MODERATE– Extended driving with this code can cause internal engine damage: On a good WOT pull the pressure climbed to 1800 - 2125 psi range. When coasting to a stop ( foot off the gas ) the fuel rail pressure briefly dropped to 280-350 psi range then returned to 425-440 range. On a cold start the pressure was 1800-2050 for the first 30 seconds or so.. Hope these number can help you out. ….

Apr 9, 2020 · 4. Jonathan C. April 9, 2020. The p0300 code on the chevy equinox means that the engine has a misfire that is not related to only one cylinder. Like. (3) pablo June 4, 2023. Misfire cylinder one spark plug wet like engine oil mile on car 66.000 2021. Like. (1) What Does Chevy Code P0420 Mean? Chevrolet P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended …Before you fix P0420, make sure you correctly diagnose the cause of the code first. If you don’t, you could end up spending $1000s buying a new catalytic converter when that wasn’t the cause of the code. Below are some of the main causes of a P0420 code. Click on sections below to learn more about each repair.Replied by Tyler on topic Chevrolet Equinox Set A Code p228D and p0089 Reduced Engine Power I like pole71's suggestion to investigate the rail pressure sensor. A quick check is to run the low …Top Answer Xavier T. December 21, 2020 When the Chevy Equinox displays a p0420 fault code, this indicates a bad oxygen sensor. Replacing the …What Does Chevrolet Equinox Code P0011 Mean? Chevrolet Equinox P0011 definition: Intake Camshaft Timing – Over-Advanced Bank 1 Issue Severity: SEVERE – Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid damage to multiple internal engine components. Diagnosis: This …The code P0420 for your 2.4 L engine is for the after the catalyst O2 sensor. Your vehicle has only two O2 sensors. One is in manifold before the catalyst and the other is after the catalyst. The code can be from a defective sensor or catalytic convertor. The system should have further tests done to make sure the correct part is replaced before ...Watch on What Does Chevy Code P0420 Mean? Chevrolet P0420 definition : Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE - Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid further damage to your emission system and possible engine damage.Have you had trouble finding youre down stream oxygen sensor? We had the common check engine code p0420 come up we started with replacing the upstream senso...If your Chevy Equinox has the P0420 code, it means that the catalytic converter is not functioning properly. There are a few things that can cause this, but the most common is a problem with the oxygen sensor. If you have this code, take your car to a mechanic and have them check the oxygen sensor. Code p0420 chevy equinox, Technician. automotive technology. 157 satisfied customers. I am working on a 2011 Chevy Equinox. I was getting a cat. I am working on a 2011 Chevy Equinox. I was getting a cat low efficiency code P0420 (Catalytic system efficiency below threshold Bank 1), so I … read more., A P0420 code is set when the upstream sensor and the downstream oxygen sensor sense the catalytic converter is not doing its job. Basically, the amount of oxygen going into the converter is not being burned, and it detects it through the downstream sensor. Oxygen is the key here. Modern Engine Management Systems leave a little bit of extra ..., Codes: (MOST CURRENT CODES AS OF RIGHT NOW) P2097: Post catalytic converter fuel trim (FT) bank 1- too rich. P0420: Catalytic converter system, bank 1 -efficiency below threshold. Exact Chevy Diagnosis: CAUSE: ENG replaced valve cover, customer declined spark plugs, advised converter may have been damaged also., Jan 4, 2020 · 2012 Chevy equinox 2.4L at about 135K miles threw a fan belt about 6 months ago on a road trip. Limped it to a dealership for fanbelt replacement and they said the timing chain was making a lot of noise and need replaced too. So I got it back home and had a shop do the timing chain with new tensioners and guide vanes as well as new water pump. , Jan 7, 2022 · Service stabilitrak, flashing CEL and rough idle. After a week of not being driven, finally threw codes P0302 (cylinder 2 misfire) and P0036 (downstream o2 sensor). The shop says it looks like someone tried to steal my catalytic converters and cut o2 sensor wire.Would a downstream sensor cause (specific cylinder) misfire, and sudden rough idle. , The P0420 code signals a low catalyst system efficiency. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car ... , 2013 Chevy Cruze LT 1.4 Turbo I have code P0420.I've changed the Bank 1 sensor 1 sensor and the code came back. ... 2005 Chevy Equinox w/ code P0420 scanned at Autozone.. 78,000miles.. AWD.. Any suggestions to fix this Catalyst System Efficiency Below Threshold problem! ..., Feb 21, 2022 · Common P0420 Diagnosis Mistakes. Oftentimes, this code is thought to be a faulty O2 sensor or A/F Sensor. While this is a possibility, the most common problem is a faulty catalytic converter. Do not overlook other codes that are paired along with P0420. Codes like P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, and P0308 are misfire ... , I changed the o2 sensors 2008 Chevy Avalanche. Check engine light comes up every 2 weeks. sometimes a bit of rough idle at 500 RPM other times runs great. ... I have a p0420 code on my 2018 chev equinox lt 1.5 tubrocharge. But mechanic saying it might be my o2 senor but I change and code still come up. Should I just change …, Diagnosing the error code P0420 on a Chevy Equinox (2011) Wicked Wrench Garage 540 subscribers 8 Share 2.7K views 8 months ago SEATTLE Diagnosing the error code P0420 on a Chevy..., Before you fix P0420, make sure you correctly diagnose the cause of the code first. If you don’t, you could end up spending $1000s buying a new catalytic converter when that wasn’t the cause of the code. Below are some of the main causes of a P0420 code. Click on sections below to learn more about each repair., When it comes to purchasing a vehicle, the options can be overwhelming. From brand-new models to used cars, there are many factors to consider. If you’re in the market for a reliable and affordable SUV, a pre-owned Chevy Equinox might be ju..., Chevy equinox 2011: code p0420. americanfoxusa. Dec 16, 2018. Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission. Dec 16, 2018. #1. A., 4. Jonathan C. April 9, 2020. The p0300 code on the chevy equinox means that the engine has a misfire that is not related to only one cylinder. Like. (3) pablo June 4, 2023. Misfire cylinder one spark plug wet like engine oil mile on car 66.000 2021. Like. (1), Apr 19, 2018 · Diagnosing P0420 and P0171. Hey everyone! My very first post! Greetings all. I'll just jump right in, I just bought a 2014 Equinox LT AWD about 6 months ago. My check engine light came on so I decided to get a OBD II device and check what could be wrong. It threw the P0171 (Lean Engine) and P0420 (Catalyst efficiency below threshold) codes both. , Dec 13, 2022 · Diagnosis: The most common cause of Chevrolet Equinox P0420 is a bad catalytic converter, but it can be caused by anything from a faulty oxygen sensor to a rich or lean running condition, or misfires. There are many variables that could cause this code. , Aug 4, 2022 · How to diagnose code P0420 on a Chevrolet Equinox. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced exhaust ... , The CEL lit up a few weeks ago with the first code, P0420, the Catalytic Converter Bank 1 was below the efficiency threshold. ... Build Date: 4-11-2019 - Bought 6-22-2019 SOLD - - 2015 Equinox LTZ 3.6L FWD Champagne Silver Metallic *Build Date 1-08-2015 * SOLD with ... Chevy Equinox, and Cadillac SRX owners and enthusiasts. Come …, Need help on a 2011 Chevy equinox LT, has a code of: P0420. Hi, need help on a 2011 Chevy equinox LT, has a code of: P0420. If i clear it out , It comes back before starting the car again., May 9, 2022 · Need help on a 2011 Chevy equinox LT, has a code of: P0420. Hi, need help on a 2011 Chevy equinox LT, has a code of: P0420. If i clear it out , It comes back before starting the car again. , Before you fix P0420, make sure you correctly diagnose the cause of the code first. If you don’t, you could end up spending $1000s buying a new catalytic converter when that wasn’t the cause of the code. Below are some of the main causes of a P0420 code. Click on sections below to learn more about each repair., The code P0420 - Catalyst Efficiency Below Threshold (Bank 1) means that there is a problem with the catalytic converter of the Bank 1. The code P0430 means the same fault for the Bank 2 catalytic converter in an engine with two cylinder banks (e.g., V6 or V8). The catalytic converter or "cat" is a key component of the vehicle emission control ..., How to diagnose code P0420 Here’s a quick rundown of how to troubleshoot and diagnose the P0420 engine code: First off, make sure that P0420 is the only engine code present. Clear the code and drive for approximately 15 minutes. Check to see if the code is returned. If not, repeat the process a few times to be sure., Jan 4, 2020 · 2012 Chevy equinox 2.4L at about 135K miles threw a fan belt about 6 months ago on a road trip. Limped it to a dealership for fanbelt replacement and they said the timing chain was making a lot of noise and need replaced too. So I got it back home and had a shop do the timing chain with new tensioners and guide vanes as well as new water pump. , A P0420 code is set when the upstream sensor and the downstream oxygen sensor sense the catalytic converter is not doing its job. Basically, the amount of oxygen going into the converter is not being burned, and it detects it through the downstream sensor. Oxygen is the key here., Jun 20, 2022 · Code P0420 Chevrolet Tech Notes. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (it is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the catalytic ... , I have a 2011 Chevy equinox, these codes keep coming up p0138, P0341, p0420, p0340. I had issues with jerking when idle, rpm’s are high when accelerating after getting to speed they drop, sometimes when stopped at light and then try and accelerate the car shuts off. I had the car looked at buy pep boys., Before you fix P0420, make sure you correctly diagnose the cause of the code first. If you don’t, you could end up spending $1000s buying a new catalytic converter when that wasn’t the cause of the code. Below are some of the main causes of a P0420 code. Click on sections below to learn more about each repair., Jul 24, 2017 · So my check engine light came on and I was able to pull a code P0420 Catalyst system low efficiency. Now I know this could mean a bad cat, bad O2 sensor(s) or even a crack in the manifold. I have a 2011 Chevy Equinox 2.4L with a little over 80k on it. Does anyone know if there is a common fix for... , 3. Views. 1K. Feb 13, 2023. corvairbob. C. I have a 2016 Equinox with a 4.2L. There have been two aftermarket converters insalled but the p0420 code keeps coming back. I'm being told the only to resolve this is to install an OEM converter from Chevy and not use aftermarket., 13 thg 9, 2023 ... Find out what a P0420 code means, how to diagnose this problem and the common fixes that you can do to resolve this trouble code., The low side fuel pressure is greater than 300 kPa (44 psi). The diagnostic runs once for each engine start. The high pressure fuel pump has exceeded it's control limits. This condition exists when the high pressure fuel pump actuator command is 0° or greater than 240°. The condition exists for greater than 10 s., Oct 8, 2022 · The code P0420 - Catalyst Efficiency Below Threshold (Bank 1) means that there is a problem with the catalytic converter of the Bank 1. The code P0430 means the same fault for the Bank 2 catalytic converter in an engine with two cylinder banks (e.g., V6 or V8). The catalytic converter or "cat" is a key component of the vehicle emission control ...