Quantcast
Jump to content

  • Welcome to Auto Parts Forum

    Whether you are a veteran automotive parts guru or just someone looking for some quick auto parts advice, register today and start a new topic in our forum. Registration is free and you can even sign up with social network platforms such as Facebook, Twitter, Google, and LinkedIn. 

     

2011 Chevy Equinox 2.4L P0420 Code


Recommended Posts

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 this? I was hoping it was a loose gas cap or something lol...But seems from looking online it can be a variety of things. 

Link to post
Share on other sites

Yes it could be a variety of things and the right thing would be to have it diagnosed either at a repair shop or a dealer, unless you are able to run some test on the 02 and exhaust. The other thing to consider is if there are some warranty or added warranty items available on this vehicle. If you haven't already, get your car loaded into myChevy https://my.chevrolet.com/home . You'll be able to see if there are any recalls and service items extended to 150k. Some of these GM vehicles have additional coverage added to them because of known issues and some include the catalytic converter, fuel pump, and also oil consumption which could trigger your code as well. :D

  • Like 1
Link to post
Share on other sites
  • 3 weeks later...

here are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly.
The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc.
The easiest thing to do first is a visual check of things. Visually inspect the exhaust system for leaks, check the catalytic converter for dents, holes, severe discoloration, and check for a rattle inside. If any of those syptoms are there, the converter likely needs replacement.
Then, visually inspect the downstream O2 sensor (behind the converter). Check for broken wires, obvious faults, etc. If all that checks out, you'll want to check the operation of the O2 sensor. To do that, you'll need access to a scan tool or oscilliscope. Check that the waveform is pretty steady. If the reading fluctuates then the sensor is likely bad and will need to be replaced.
Try this, turn the ignition key to the on position, (engine not running) and pull the fuse to your ECM for 30 seconds and then re-install it. Once re-installed, start the engine and let idle for 1 min and then go for a test drive.
If the engine stalls, let it. The ECM is relearning the sensors and engine, just restart it and after 1 min when the RPM drops. Go for a test drive and see if the service engine light comes back on and re-scan for the DTC codes and address the issues indicated by the DTC code.
 

Edited by MCT
Misspell
  • Like 1
Link to post
Share on other sites

So we left Saturday on vacation and left the equinox at the dealer to check into the car efficiency code, oil consumption, occasional hard shift, and slow l/f tire leak. So we'll see, they have it for the week. I also dug up a letter from GM for an extended warranty on replacing the cat if needed.

Link to post
Share on other sites
  • 2 weeks later...
  • 2 weeks later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Similar Topics

    • By Eliauk
      1.Difference between diesel powered refrigeration unit and engine driven refrigeration unit
      Diesel powered refrigeration unit: Independent and non-independent refrigeration units are divided according to power source. Independent refrigeration unit (Diesel powered refrigeration unit) means that the refrigeration unit has a separate power source and the unit itself has an independent power source.
      Generally speaking, diesel powered reefer unit is integrated structures, but there are also modified split structures (this structure is generally hoisted on the beam of the reefer truck). This type of unit itself has an engine and a generator that provide power and electricity to the refrigeration system Device. It can work independently without being restricted by the working state of the truck engine.
      Non-independent refrigeration unit (Engine driven refrigeration unit😞 As the name implies, it is a refrigeration unit that cannot work independently. This type of unit has no power unit and must rely on the truck engine to drive the compressor to work.
      The engine driven refrigeration unit can also be divided into an integral structure and a split structure from the structure. The split structure also includes three types of condenser front type, condenser top-mounted type and condenser bottom-mounted type (bottom-mounted or concealed); but the condenser front-mounted structure is the most common structure in split non-independent refrigeration units.

      2.Advantages and disadvantages of diesel engine refrigeration unit and engine driven refrigeration units
      Independent refrigeration unit
      Advantages: The advantage of diesel engine refrigeration unit is stability and reliability, which is also the most needed for refrigerated trucks. Since the diesel engine refrigeration unit has a separate source of power output, the refrigerator can still work when the refrigerated vehicle is turned off or the refrigerated vehicle has an engine failure, so as to ensure that the goods in the refrigerated vehicle will not deteriorate.
      Integrated independent refrigeration unit
      Disadvantages: The disadvantage of independent refrigeration units is that they are expensive and maintenance is more complicated than non-independent refrigeration units. Due to the addition of a set of power systems, independent refrigeration units are more complicated than non-independent refrigeration units in terms of maintenance, and independent refrigeration units are relatively more technically complex and more expensive.
      Non-independent refrigeration unit
      Advantages: The advantages of non-independent refrigeration units are low price, simple structure and easy maintenance.
      Disadvantages: The disadvantage of the non-independent refrigeration unit is that it relies too much on the power source of the refrigerated vehicle. When the refrigerated vehicle engine stops working, the non-independent refrigeration unit loses power support and the refrigeration system stops working. If the door is frequently opened when the vehicle is turned off, the large loss of cold air in the refrigerated box causes the temperature in the box to rise, or the refrigerator will stop cooling when the vehicle fails (engine failure), and the cargo in the vehicle is easily lost.
      3.Choice of independent refrigeration unit and non-independent refrigeration unit
      From the price point of view: If your budget is relatively sufficient and have strict temperature requirements (the required temperature should be at least minus 10 degrees below) ) It is recommended to use a diesel powered refrigeration unit.
      In terms of the length of transportation distance: For short-distance distribution within the city or between districts and counties, it is recommended to use non-independent units, which not only lower the procurement cost, but also easy to repair even if there is a failure; For long-distance transportation, it is recommended to use independent refrigeration units, because Even if the vehicle engine stops working during long-distance transportation, the refrigerator can still cool normally to ensure the safety of the transported items.
      In terms of vehicle models: Generally speaking, light trucks with a body less than 7 meters are recommended to use non-independent units. For trucks and semi-trailers above 7 meters, independent refrigeration units are better.
      If you have any questions, please feel free to contact us. [email protected]
    • By Eliauk
      Truck refrigeration system consists of four parts: compressor, condenser, expansion valve and evaporator.
      transport refrigeration units
      1.compressor
      The compressor is the power of the refrigeration cycle and is driven by an electric motor to continuously rotate. It can not only extract the vapor in the evaporator in time, maintain low temperature and low pressure, but also increase the pressure and temperature of the refrigerant vapor through the compression function, creating conditions to transfer the heat of the refrigerant vapor to the external environment medium. In other words, the low-temperature and low-pressure refrigerant vapor is compressed to a high-temperature and high-pressure state, and room temperature air or water is used as a cooling medium to condense the refrigerant vapor.
       
      The function of the compressor is to compress low-pressure steam into high-pressure steam, thereby reducing steam volume and increasing pressure. The compressor sucks the working medium vapor with lower pressure from the evaporator, and sends it to the condenser after the pressure increases. The high-pressure liquid is condensed in the condenser. After being throttled by the throttle valve, it becomes a low-pressure liquid and is sent to the evaporator. In the evaporator, it absorbs heat and evaporates into low-pressure steam, which is then sent to the compressor inlet to complete the refrigeration cycle.
       
      2.Condenser
       
      The condenser is a heat exchange device that uses the ambient cooling medium (air or water) to take the heat of the high temperature and high pressure cooling steam from the cooling compressor, so that the high temperature and high pressure refrigerant vapor is cooled and condensed into a high pressure normal temperature refrigerant liquid. It is worth mentioning that in the process of transforming refrigerant vapor into refrigerant liquid, the pressure of the condenser is constant and still at high pressure.
       
      3.Throttle element (namely expansion valve)
       
      The high-pressure and normal-temperature refrigerant liquid is directly sent to the low-temperature scale evaporator. According to the corresponding principle of saturation pressure and saturation temperature, the pressure of the refrigerant liquid is reduced, thereby reducing the temperature of the refrigerant liquid. The high-pressure and normal-temperature refrigerant liquid passes through the throttling element of the decompression device to obtain a low-temperature and low-pressure refrigerant, which is sent to the evaporator to absorb heat and evaporate. In daily life, capillary tubes are often used as throttling elements for refrigerators and air conditioners.
       
      4.Evaporator
       
      The evaporator is also a heat exchange device. The low-temperature and low-pressure refrigerant liquid evaporates (boils) into steam after being throttled, absorbs the heat of the material to be cooled, reduces the temperature of the material, and achieves the purpose of freezing food. In the air conditioner, the surrounding air is cooled to cool and dehumidify the air. The lower the evaporation temperature of the refrigerant in the evaporator, the lower the temperature of the cooling substance. In the refrigerator, the evaporation temperature of the general refrigerant is adjusted to -26°C to -20°C, and in the air conditioner, it is adjusted to 5°C to -8°C.
       
      We have over 20 years history and are TOP 1 export manufacturer among all Chinese Truck refrigeration system Suppliers. We not only provide high quality products, but also provide Professional technical support, Timely after-sale service,big project developing support,Key client developing support and so on.
       
      We are seeking for dealer worldwide, welcome to visit our Truck refrigeration system factory to cooperate with us!
      transport refrigeration systems
      You are also welcome to follow Corunclima on Facebook& Linkedin!
       

      Truck refrigeration system V450F for midtrucks from 12-28m³
    • By sneedspeed
      At Sneed4Speed, get the best deals on Mini Cooper Replacement Engine and other parts with an affordable price. At Sneed4Speed all engines are properly checked, cleaned and hand assembled by one of our master race engine builders.  All engines come with a 1 year warranty against manufacturer defects. 

    • By RockAuto
      Get a $25 rebate with purchase of an AMS Clutch System Kit.
      View on RockAuto.com

×
  • Create New...