Error Code P0439: What It Means & What To Do?

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The P0439 trouble code means that the PCM has received a voltage reading by the catalyst heater control circuit which is below the acceptable range for proper functioning of the engine. The PCM would use this data from a lot of sensors in the car engine bank to detect how effectively the catalyst converters are functioning.

P0439 error code can be described as Catalyst Heater Control Circuit (Bank 2).

Willing to learn more about P0439 error code? This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the Catalyst Heater Control Circuit (Bank 2)?

• Using the wrong fuel type
• A faulty coolant temperature sensor
• A faulty mass air flow sensor
• A faulty manifold air pressure sensor
• A faulty fuel pressure regulator or other fuel injection component
• Contaminated oil
• Faulty catalyst temperature sensor
• Poor electrical connection in the catalyst temperature sensor
• Open or short catalyst temperature sensor harness

1. Powertrain Control Module - There can be some issues with the PCM due to which you may see P0439 code appearing over and over again. Visit us to buy best quality PCM online.
2. Air Fuel Ratio Sensor - A lot of issues can arise do to defective turbocharger/supercharger. Did you just see P0439 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Oxygen Sensor - Faulty boost pressure/ turbocharger position sensor can be the reason why P0439 code is flashing. Visit us to purchase top notch turbocharger/supercharger online.
4. Engine Control Module - It is an important auto part which needs full care. A faulty PCM can be a reason behind the flashing up of P0439 code.
5. Camshaft Sensor - OBD Code P0439 can appear because of faulty boost pressure/ turbocharger position sensor. 

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0439 here:

Common Symptoms

• Excessive black smoke can start coming out from exhaust
• Other related diagnostic trouble codes can appear
• The fuel efficiency can start declining
• Overall engine performance decreases
• Malfunction indicator lamp illumination

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• Repair the bad electrical connection in the catalyst temperature sensor
• You must replace the defective catalytic converter
• The flawed catalyst temperature sensor should be replaced
• Make sure to repair the open or short catalyst temperature sensor harness
• Restore the damaged oxygen sensors

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Here are some steps which you should follow in order to diagnose this fault code:

• If you want to diagnose the problem which is giving rise to the P0439 code, then the mechanic should verify the code with an OBD-II scanner, and then perform a visual inspection of all electrical components.
• If they find out that any electrical wires or connectors are damaged, loose, or corroded, then they must be replaced immediately. In order to determine if this repair fixed the issue, the P0439 code should be cleared from the PCM, and the system should then be retested properly
• If the code reappears, the electrical wiring was not to blame, and the mechanic should move on to the two most common malfunctions that cause this issue: the oxygen sensors and the catalytic converter
• After each repair is attempted, the mechanic should clear the code and perform a retest to ensure that the issue was fully diagnosed as well as repaired

Common Mistakes When Diagnosing The P0439 Code

Most of the people try to replace some other parts because replacing the catalytic converters can turn out to be costly process. But in long run, this would result in spending a lot of money