I have a multiple cylinder engine mis Fire code. It happens every morning after 4-7 miles. Car goes into limp mode, I pull over shut off and restart and do not have an issue the rest of the day.

Asked by Dec 31, 2015 at 07:43 AM about the GMC Yukon

Question type: Maintenance & Repair

spark plugs and wires were already changed

2 Answers

79,115

Possible causes - Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient cylinders compression - Incorrect fuel pressure What does this mean? What does this mean? Tech notes The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes". There is a factory service bulletin for the following GMC models: 2000-2008 GMC Sonoma 2000-2008 GMC Sierra 2000-2008 GMC Yukon 2000-2008 GMC Yukon XL 2001-2008 GMC Denali 2001-2008 GMC Denali XL 2001-2008 GMC Savana 2002-2008 GMC Envoy 2002-2008 GMC Safari 2002-2008 GMC Jimmy 2000-2008 GMC Factory Service Bulletin OBDII Code P0300

2 of 2 people found this helpful.

Hi I have gmc yukon xl 2015 misfire cylender 2 I changed plugs wires and even injecters same problem coming up .now i dont know what to do?

Your Answer

GMC Yukon Experts

  • #1
    clayduster71
    Reputation
    2,780
  • #2
    David Boccabello
    Reputation
    920
  • #3
    Drpsychmom
    Reputation
    750
View All

Related Models For Sale

Used Chevrolet Tahoe
818 Great Deals out of 39,941 listings starting at $1,900
Used Cadillac Escalade
284 Great Deals out of 12,164 listings starting at $2,995
Used GMC Yukon XL
290 Great Deals out of 13,339 listings starting at $1,750
Used Chevrolet Suburban
499 Great Deals out of 23,259 listings starting at $1,995
Used GMC Sierra 1500
1,131 Great Deals out of 61,548 listings starting at $1,295
Used GMC Acadia
816 Great Deals out of 43,549 listings starting at $2,800
Used Ford Expedition
487 Great Deals out of 20,190 listings starting at $1,295
Used Chevrolet Silverado 1500
2,727 Great Deals out of 156,978 listings starting at $1,000
Used Cadillac Escalade ESV
147 Great Deals out of 6,317 listings starting at $1,995
Used Ford F-150
3,018 Great Deals out of 230,446 listings starting at $1,300
Used Jeep Grand Cherokee
888 Great Deals out of 71,574 listings starting at $900
Used Ford Explorer
1,082 Great Deals out of 67,959 listings starting at $1,500
Used Dodge Durango
263 Great Deals out of 24,857 listings starting at $1,500
Used Nissan Armada
126 Great Deals out of 10,278 listings starting at $1,990
Used Toyota 4Runner
343 Great Deals out of 29,179 listings starting at $1,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.