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Old 12-18-2012, 04:23 PM   #1
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PO300, 302,303,305 codes

Today my CEL came on, I scanned it and got the PO300,302,303,305
Random misfire and misfire on 2,3 and 5 cylinder. The car has been running fine. There are no tunes, and the only mods on the engine is a K & N CAI and flowmaster exhaust.

Can anyone give insight? I couldn't clear the codes off either.
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Old 12-18-2012, 04:25 PM   #2
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Take it to the dealer.
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Old 12-18-2012, 04:25 PM   #3
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Quote:
Originally Posted by Frid View Post
Take it to the dealer.
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Old 12-18-2012, 04:43 PM   #4
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Onstar can tell you what the codes are, and I'm sure you can look up the codes online somewhere.
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Old 12-18-2012, 10:01 PM   #5
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my friend would get those codes on Trifecta tune with ghost cam...but that causes that for no effect.
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Old 12-19-2012, 10:44 AM   #6
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My 2010 did this and there was a re-flash for it.
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Old 12-19-2012, 11:46 PM   #7
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What is wierd is the performance is fine.
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Old 12-20-2012, 12:06 AM   #8
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Call the dealer and ask if there are any TSB(Technical Service Bulletin) for your car.
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Old 12-20-2012, 07:28 AM   #9
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If its under warranty take it to the dealer, if its not any scan tool with enhanced capabilities can look at the misfire counter and see if its really misfiring or if there is another problem. It may not be clearing because there are now things called permanent codes that will only clear after the problem is corrected and the computer verifies that is the case.
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Old 12-22-2012, 11:46 PM   #10
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just go get the re-flash for it
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