P0312 OBD Error Code: Problem & Solutions

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The P0312 is a fault code which starts appearing when the car engine has a misfire which is not related to just one cylinder. This code would set the check engine light and it should be as soon as possible. 

The trouble code P0312 can be defined as Cylinder 12 Misfire Detected.

The meaning of misfire is just what it sounds like, a cylinder which is not firing as it should. The P0312 is a fault code which is caused due to a misfire on the number 12 cylinder. The misfire monitor diagnostic would be based on the variation in the crankshaft velocity. This information would be then determined by the powertrain control module by using the crankshaft position sensor as well as camshaft position sensor.

What causes this problem with the Cylinder 12 Misfire Detected?

• The valves might be burned
• Quirks in the spark plug 12
• The camshaft sensor might have some defects
• Defaults in the mass airflow sensor
• Problems with the catalytic converter
• The fuel injector 12 might be faulty or clogged
• Opened or shorted fuel injector 12 harness
• There can be some issues in the fuel injectors
• The ignition timing might be bad
• Leakage in the vacuum
• Flaws in the crankshaft sensor
• Bad electrical connection in the fuel injector 12 circuit
• Ignition coil 12 harness might be open or shorted
• There can be insufficient cylinder 12 compression
• Incorrect fuel pressure
• Issue of intake air leak

1. Spark Plug - OBD Code P0312 can appear because of faulty Spark Plug.
2. Oxygen Sensor - There can be some issues with the Oxygen Sensor due to which you may see P0312 code appearing over and over again. Visit us to buy best quality Oxygen Sensor online.
3. Camshaft Sensor - Are you facing some faults in your Camshaft Sensor? Don’t worry and get them replaced or else P0312 code can turn up.
4. Head Gasket - Common cause behind this P0312 error code can be some fault in Head Gasket. So, it will be a good decision to replace them now.
5. Powertrain Control Module - Camshaft Sensor is perfectly fine but still but having that trouble code P0312 flashing? In such a situation your Powertrain Control Module might be faulty. Why don’t you think of getting that replaced?
6. Crankshaft Sensor - The P0312 code can also arise due to some issues in Crankshaft Sensor. So it is advised to replace them as soon as possible.
7. Fuel Injector - P0312 code does not really end up spoiling your Crankshaft Sensor, but it might also accompany few Fuel Injector issues. We have best Fuel Injector with us.

It is essential 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 P0312 here:

Common Symptoms

• Fuel smell may start coming from the exhaust
• Hesitations/Jerking when accelerating
• Illumination in the check engine light
• Engine might start running roughly and may shake
• There can be lack of power in the engine
• The car engine may die
• Engine may not start at all
• The fuel economy might start decreasing

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0312:

• You can always replace the damaged spark plug
• The damaged spark plugs wires should be replaced
• Repairing damaged engine components
• Fix the leaking head gaskets
• Replace the burned valves
• The worst-case scenario would be having to replace the engine because cylinder damage had become so extensive

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

• A mechanic should begin by using an OBD-II scanner to find out which problem codes have been stored by the PCM
• They all the engine components should be checked properly
• This would include cylinder #12, its spark plug, wiring and connectors.
• After making necessary repairs and replacements, a test drive would be necessary while the scanner is plugged in and live

Common Mistakes When Diagnosing The P0312 Code

The most common mistake which is done by many people is that they just replace the spark plug and think that it would be sufficient

There are a lot of problems which would give rise to P0312 code, that’s the reason why replacing just a spark plug without doing a comprehensive diagnosis would be a big mistake