P0301, p0302, p0303, p0304, p0305, p0306 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-23-2009, 11:12 PM   #1
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Default P0301, p0302, p0303, p0304, p0305, p0306

P0301, P0302, P0303, P0304, P0305, P0306

P0301 Cylinder #1 Misfire Detected
P0302 Cylinder #2 Misfire Detected
P0303 Cylinder #3 Misfire Detected
P0304 Cylinder #4 Misfire Detected
P0305 Cylinder #5 Misfire Detected
P0306 Cylinder #6 Misfire Detected

A P030x code means that the the car'* computer has detected that one of the engine'* cylinders is not firing properly.

Symptoms may include:
  • Engine may be harder to start
  • Engine may stumble and or hesitate
A code P030x may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor
  • Faulty fuel injector
  • Faulty ICM
  • Burned exhaust valve
  • Faulty catalytic converter
  • Running out of fuel
  • Poor compression
  • Faulty MAF
  • Defective computer
Possible Solutions
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obd2, obdii, p0301, p0302, p0303, p0304, p0305, p0306, p301, p302, p303, p304, p305, p306

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