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#1
04-02-2010, 09:27 PM
Hummer Veteran
Join Date: Nov 2005
Location: Finland
Posts: 126
P0300 Random/Multiple Cylinder Misfire Detected
I´m on a long road trip far away from home (2000miles away) and hummer failed me today gave the p0300 code and started running reallly rough just all of a sudden when driving aroung 40mph. Any ideas.
Truck have 55000 miles...
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#3
04-04-2010, 04:32 AM
Hummer Veteran
Join Date: Mar 2010
Posts: 107
Re: P0300 Random/Multiple Cylinder Misfire Detected
same here had the code when my cat converter failed
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#4
04-04-2010, 04:55 AM
Hummer Expert
Join Date: Sep 2007
Location: Mason, OH
Posts: 779
Re: P0300 Random/Multiple Cylinder Misfire Detected
When my cats went I did not get that code. But mine did go out at almost the same mileage you have now. Typically when cats are going out you get O2 sensor codes. However if those guys had that code when cats went I would check there first. Then go pulling spark plugs and check if your cats are clear. If it is truly ignition i would replace plugs and cam/crank sensor.
Last edited by HumminNBoatin' : 04-04-2010 at 05:01 AM.
#5
04-04-2010, 11:17 AM
Hummer Veteran
Join Date: Nov 2005
Location: Finland
Posts: 126
Re: P0300 Random/Multiple Cylinder Misfire Detected
This happened after I had some deep snow fun moment earlier.
Goin to do just regular maintenance first hope it helps. Plug wires, Fuel filter, maybe plugs if thy look bad.
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