P0307 GMC - Cylinder 7 Misfire Detected
Repair Importance Level:
Repair Difficulty Level:
- Faulty spark plug 7
- Clogged or faulty fuel injector 7
- Faulty ignition coil 7
- Fuel injector 7 harness is open or shorted
- Fuel injector 7 circuit poor electrical connection
- Ignition coil 7 harness is open or shorted
- Ignition coil 7 circuit poor electrical connection
- Insufficient cylinder 7 compression
- Incorrect fuel pressure
- Intake air leak
The P0307 code means that the cylinder 7 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 7. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"
When is the code detected?
Engine Cylinder 7 is Misfiring.
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0307 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.
Need more help?
Do you need more help with the P0307 GMC code? ask a question to our users or search the top hand picked automotive forums for more information
GMC Technical Service Bulletins for P0307 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
Repair Shops Around Your Area
Need parts to fix this code? Search hundreds of stores at the same time and compare prices
Help us improve Engine-Codes.com. Leave a comment below or tell us if the information above help you fix the code. What are symptoms is your vehicle for the P0307 GMC code? Have you replaced any parts?
Any information is appreciated. Thanks