2003 SLS ECM code: DTC "P0300

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Northstar Engines and System Technical Discussion Discussion, 2003 SLS ECM code: DTC "P0300 in Cadillac Engine Technical Discussion; "Engine Misfire" Anyone care to assist me with this? To date, I have replaced the crank sensors but not the ...
  1. #1
    scottio is offline Cadillac Owners Member
    Join Date
    Mar 2005
    Nashville, TN

    2003 SLS ECM code: DTC "P0300

    "Engine Misfire"

    Anyone care to assist me with this? To date, I have replaced the crank sensors but not the cam sensor, the alternator and cleaned both coil packs. It runs great but MIL flashes 15 or 20 times then sets to on. Any suggestions?

    Scott in Nashville

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  3. #2
    Logandiagnostic's Avatar
    Logandiagnostic is offline Cadillac Owners Connoisseur
    Automobile(s): 2001 DTS, 2005 Mustang GT, 2010 MINI S
    Join Date
    Feb 2003
    Nashville, TN

    Exclamation Re: 2003 SLS ECM code: DTC "P0300

    One of the most common GM OBDII codes.

    Po300 is engine misfire detected. You can see which cylinder using a GM Tech 2. We have a GM Tech 2 and are in Nashville (near Brentwood.)

    The flashing check engine light is indicating that the miss is bad enough to potentially damage the cat converter.

    Could be bad plug or coil pack.

    Logan Diagnostic

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