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P0302 GMC

P0302 GMC - Cylinder 2 Misfire Detected

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P0302 GMC Comments |  Add Comment
Possible causes
- Faulty spark plug 2
- Clogged or faulty fuel injector 2
- Faulty ignition coil 2
- Fuel injector 2 harness is open or shorted
- Fuel injector 2 circuit poor electrical connection
- Ignition coil 2 harness is open or shorted
- Ignition coil 2 circuit poor electrical connection
- Insufficient cylinder 2 compression
- Incorrect fuel pressure
- Intake air leak
Help with Possible causes What does this mean?
Tech notes
The P0302 code means that the cylinder 2 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 2. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"
Help with Tech Notes What does this mean?
When is the code detected?
Engine Cylinder 2 is Misfiring.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0302 GMC Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

GMC Technical Service Bulletins for P0302 code
2007 GMC SIERRA Engine And Engine Cooling:engine Details
2007 GMC YUKON Engine And Engine Cooling:engine Details
2007 GMC YUKON DENALI Engine And Engine Cooling:engine Details
2007 GMC YUKON DENALI XL Engine And Engine Cooling:engine Details
2007 GMC YUKON XL Engine And Engine Cooling:engine Details
2008 GMC SIERRA DENALI Engine And Engine Cooling:engine Details
2007 GMC YUKON 061000 Engine And Engine Cooling:engine Details
2007 GMC SIERRA 061000 Engine And Engine Cooling:engine Details
2007 GMC YUKON DENALI 061000 Engine And Engine Cooling:engine Details
2007 GMC YUKON XL 061000 Engine And Engine Cooling:engine Details
More Bulletins Help with Technical Service Bulletins What does this mean?
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