P0300 NISSAN - Cylinder Misfire Detected Random Cylinders

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

P0300 NISSAN - Cylinder Misfire Detected Random Cylinders

P0300 Nissan Code Mean

This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. So this engine code article applies to Chevrolet, Ford, Nissan, Toyota, Dodge, Honda, GMC, etc. Basically this P0300 code means that the the car's computer has detected that not all of the engine's cylinders are firing properly. A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

P0300 NISSAN Possible Causes 

  1. Faulty spark plug (s)
  2. Faulty ignition coil (s)
  3. Clogged or faulty fuel injector (s)
  4. Intake air leak
  5. Fuel injectors harness is open or shorted
  6. Fuel Injectors circuit poor electrical connection
  7. Ignition coils harness is open or shorted
  8. Ignition coils circuit poor electrical connection
  9. Insufficient cylinders compression
  10. Incorrect fuel pressure

P0300 Nissan Symptoms

  • The engine may be harder to start 
  • The engine may stumble / stumble, and/or hesitate 
  • Other symptoms may also be present
  • Lack/loss of power