How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask K. Wiggins Your Own Question
K. Wiggins
K. Wiggins, GMC Technician
Category: GM
Satisfied Customers: 2914
Experience:  ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade
Type Your GM Question Here...
K. Wiggins is online now
A new question is answered every 9 seconds

GM gmc sierra: Have a 2006 gmc sierra throwing codes p0300,p0449,p0455.Its

This answer was rated:

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.
K. Wiggins and 2 other GM Specialists are ready to help you