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I have replaced the throttle position sensor, all plugs and coils and the camshaft position sensor. I am getting codes 300, 305 and 355.

If I unplug the battery and let it sit for a few it starts right up and runs great for awhile but then codes will start coming back.

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  • Cars & Trucks Master
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What make vehicle , model an year . P0300 is a random misfire , P0305 is a misfire on cylinder # 5 P0355 P0355 Ignition Coil Primary Secondary Circuit Malfunction Could be a bad PCM .

Posted on Mar 27, 2016

  • Michael Smith Mar 27, 2016

    it is a 2000 jeep grand cherokee 4.7L. I think its weird if I unhook the battery for awhile then reconnect the codes go away for awhile and it runs perfect.

  • Jeff Armer Mar 27, 2016

    I'm not sure about Jeeps but some manufactures have a strategy programmed in the computer , that if a misfire happens , to protect the transistor that controls that coil. It will shut it off an resetting the PCM Will get it working again . Till the problem happens again. I would look for a wiring problem on cylinder #5 .Do you know how to read a wiring diagram ? Go herehttp://www.bbbind.com/free_tsb.html free wiring diagrams . There are some good videos on youtube , basic electrical trouble shooting , trouble shooting all the codes you have . Myself P0355 is the code I'd checking out . I have service info for ford an GM ,diagnostic trouble flow chart . It could work for your problem .

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