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Thread: 02 ESCALADE EXT 140K DTC p0200 & p0307 questions

  1. #1
    Ragtp66 is offline Cadillac Owners Member
    Automobile(s): 2002 Escalade EXT
    Join Date
    Feb 2014

    02 ESCALADE EXT 140K DTC p0200 & p0307 questions

    I am getting codes p0307 and p0200. I know normally you would start with the highest dtc first P0307 would be cylinder misfire on cylinder #7 I dont visually see a broken plug wire or that it rubbed on anything. I will try wetting the wires and look for arcing and pull the plug. I am curious though as the P0200 I am thinking is more injector related which if it was dirty or shorted would throw the 200 and then also the p0307. I will try to ohm the injector and check with a noid light for pulses in the morning. It does have a stumble from idle when accelerating at idle feels like it may stall but hasnt yet. I will probably end up doing a full tuneup. Plugs wires fuel and air filters. I am thinking it may not be a bad idea to pull the injectors and have them sonic cleaned and flow tested. If anyone has any other suggestions please let me know.


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  3. #2
    Join Date
    May 2014
    Swap plug/wire/coil. Swap inj. If problem moves address defective part. GM does not recommend Sonic clean.


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