Multiple Cylinder Misfire

Diagnostic Trouble Code (DTC) P0300

Multiple Cylinder Misfire (Catalyst Damage)




                                               Circuit Features


  • To detect whether the engine is misfiring, the ECM keeps a check on the crankshaft.
  • The ECM also supervises the camshaft positions for the same purpose as mentioned in the first sentence.
  • The ECM waits to pick up signals for a quick dip in crankshaft speed.
  • The system executes this test in blocks of 200 engine revolution tests.
  • The number of tests may vary between one to many in order to store a DTC, the MIL.
  • If there is severe misfire then the MIL will begin to glow , indicating that catalyst damage is likely to occur.







Time for setting the DTC

Task boosted after DTC sets

When will DTC clear?

1) When the engine speed is < 4,500 rpm.


1) The Malfunction Indicator Lamp (MIL) will be seen blinking.


1) The Scan Tool can be used to clear off all DTCs

2) When the fuel tank level is > 20%.

2) The ECM will begin to record operating conditions at the time when the diagnostic fails which will be stored in the Freeze Frame.


2) A history DTC will clear by itself after 40 successive warm-up cycles flawlessly

3) When there is no anti-jerk correction.

3) A history Diagnostic Trouble Code (DTC) will be stored.



3)  Disconnecting the ECM battery feed for 10 seconds

4) When there is no rough road detection.



5) When there is no crankshaft oscillation detection.




6) When DTCs P0107, P0108, P0122, P0123, P0341, P0342, P0336 and P0337 are not set.






Diagnostic Assistance

The Following diagnostic tools are available for further verification.


  • A flawed reluctor wheel can cause an intermittent.
  • Remove the CKP sensor
  • Examine the reluctor wheel through the sensor mount hole.
  • Look out for porosity and wheel condition. If the DTC is intermittent then refer to "Symptoms Diagnosis" in this section.