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

1 Answer

37,905

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 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

Search GMC Yukon Questions

GMC Yukon Experts

#1 clayduster71
clayduster71
Reputation 1,980
#2 Danielle Heller
Danielle Heller
Reputation 440
#3 David Boccabello
David Boccabello
Reputation 380
View All

Related Models For Sale

Used Chevrolet Tahoe
1,064 Great Deals out of 32,232 listings starting at $1,495
Used Cadillac Escalade
368 Great Deals out of 11,028 listings starting at $1,800
Used GMC Yukon XL
393 Great Deals out of 13,224 listings starting at $1,995
Used Chevrolet Suburban
701 Great Deals out of 21,947 listings starting at $2,095
Used GMC Sierra 1500
1,145 Great Deals out of 57,997 listings starting at $995
Used GMC Acadia
1,065 Great Deals out of 40,519 listings starting at $3,505
Used Ford Expedition
621 Great Deals out of 22,769 listings starting at $1,200
Used Chevrolet Silverado 1500
2,604 Great Deals out of 149,094 listings starting at $1,800
Used Jeep Grand Cherokee
1,122 Great Deals out of 69,334 listings starting at $1,500
Used Ford F-150
3,371 Great Deals out of 203,973 listings starting at $1,273
Used Ford Explorer
1,434 Great Deals out of 72,311 listings starting at $985
Used Dodge Durango
461 Great Deals out of 23,039 listings starting at $950
Used Toyota 4Runner
376 Great Deals out of 20,315 listings starting at $2,499
Used Toyota Sequoia
169 Great Deals out of 6,838 listings starting at $2,477
Used Cadillac Escalade ESV
161 Great Deals out of 5,853 listings starting at $3,995