P0302
High SeverityCylinder 2 Misfire Detected
Ignition System
What Does P0302 Mean?
Cylinder 2 is misfiring.
Common Fix
Replace spark plug or coil
Estimated Cost (DIY)
$20 - $500
Symptoms
- ⚠️Rough idle
- ⚠️Power loss
- ⚠️Check engine light
- ⚠️Vibration
Related Symptoms
Common Causes
How to Diagnose P0302
- 1Swap plug or coil to another cylinder to test
- 2Check injector
- 3Compression test if spark/fuel OK
OEM Diagnostic Flowchart
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Related Resources
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OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali AWD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali 2WD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-6.0L Service Manual | Operation CHARM Operation CHARM : Car repair...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-5.3L Service Manual | Operation CHARM Operation CHARM : Car repair...
Exact Repair Workflows
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Open the exact repair flow most commonly associated with P0302 on this vehicle.
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Related Symptoms
Browse →Rough idle often traces back to ignition, air metering, vacuum leaks, or timing-related faults before it becomes a full misfire complaint.
A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.
Exact Vehicle Hubs
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Open the exact vehicle hub grounded by OEM manual evidence related to P0302.
Open the exact vehicle hub grounded by OEM manual evidence related to P0302.
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Related Codes
The engine is misfiring across multiple cylinders. This is often caused by something that affects all cylinders — spark plugs, fuel quality, vacuum leak, or low compression.
Cylinder 1 is misfiring — not firing properly. Could be spark plug, coil, injector, or compression issue on that specific cylinder.
Cylinder 3 is misfiring.
Frequently Asked Questions
- Is the diagnosis the same for all cylinder misfires?
- Yes — P0301 through P0308 are diagnosed the same way. Swap components to the affected cylinder to isolate the cause.
- What if the misfire does not follow the coil or plug?
- Then the issue is specific to the cylinder — check injector, compression, or valve timing on that cylinder.
Related Repair Guides
If your vehicle has triggered P0302, these DIY repair guides may help: