GM Engine Codes - P3004

Cylinder Misfire Detected

What it means: OBD-II code P3004 represents a misfire in cylinder number 4 in your GM’s engine.

A diagnostic code of P3004 is your car’s way of telling you that multiple or random misfires are happening. If the last number of this code is something other than zero, it is telling you that is the cylinder causing the misfire. For example, if the code is P3004, it is cylinder number 4 that is misfiring. 

GM ls1 engineThe GM LS1 V8 engine is notorious for a misfire in cylinder number 4.

In GM V8 vehicles, a misfire in the number four cylinder is a notorious phenomenon, and the cause isn’t always the same from vehicle to vehicle. When this happens, you might look to these issues to nail down the problem:

  • Bad spark plugs or spark plug wires
  • Faulty coil pack
  • Failing O2 Sensor
  • Faulty fuel injector
  • Burned exhaust valve
  • Failed catalytic converter
  • Stuck or bad EGR valve
  • Bad cam position sensor
  • Faulty ECM

Without other symptoms or codes, the best thing to do is to clear the code and hope it doesn’t come back. If the code persists, start by performing a tune up on the mentioned parts that could be problematic. Many times, major problems causing a misfire will also coming up with other symptoms, so note any problems and troubleshoot based off the trouble code and secondary symptoms as well.

NOTE: While every effort has been made to provide correct information and advice about this problem, this write-up is meant to explain the trouble code P3004 and is not meant to act as a definitive troubleshooting guide.