P0308 - CYLINDER #8 MISFIRE

POST UPDATED IN September, 2020

Description of DTC code P0308 Generic

The misfire monitor checks the Crank Position Sensor (CKP) constantly to detect misfires.

When there are misfires, the most likely cause is that one of the cylinders is not working properly. In this case, DTC code P0308 OBDII indicates that cylinder number eight is not firing as it should. It should be noted that this code only indicates that an ignition failure has been detected, not necessarily because the cylinder is defective. For this reason, it is needed to do a thorough diagnosis.

Symptoms of fault code P0308 Generic

  • Malfunction Indicator Lamp (MIL) or Check Engine lights up.
  • Vibrations when driving at idle.
  • It lowers engine performance.
  • Lower fuel economy.

Causes of OBD2 P0308 Generic

The diagnostic code P0308 OBD2 is set because of the following reasons:

  • Components such as spark plugs, ignition coils, or cylinder cables may be in poor condition.
  • Defective number 8 fuel injector.
  • A low level of fuel.
  • Bad compression.
  • The Oxygen Sensor may be defective.

Possible solutions of the DTC code P0308 Generic

To resolve the fault code P0308 OBDII, you should check the following:

  • If there are no symptoms, the first thing you should do is delete the code and see if it comes back.
  • In case the engine has problems such as instability when driving, check all the connectors related to the cylinders. It is advisable to change these components as part of a maintenance program.
  • If you notice a strange odor coming from the exhaust, check the status of the Catalytic Converter (TWC). Change the converter jack.
  • Test the injector to make sure it's in good condition. If not, change it.

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