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K. Wiggins
K. Wiggins, GMC Technician
Category: GM
Satisfied Customers: 2435
Experience:  ASE Certified Technician AA in automotive Technology, 15+ years in the trade
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GM gmc sierra: Have a 2006 gmc sierra throwing codes p0300,p0449,p0455.Its

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Have a 2006 gmc sierra throwing codes p0300,p0449,p0455.Its miss firing and has no power.
Hello, the codes you have PO300 random/multiple misfire, PO455 canister purge control solenoid and PO455 large EVAP leak are all inter related.
The most likely cause of this is the purge solenoid is stuck open. This will cause the po300 and po455 codes.
This is a pretty common problem on these trucks. I will post the replacement procedure HERE Once you replace the solenoid clear the codes and you should be good. Let me know if I may assist you further.
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