P0305
High SeverityCylinder 5 Misfire Detected
Ignition System
What Does P0305 Mean?
Cylinder 5 is misfiring. Only on 5+ cylinder engines.
Common Fix
Replace spark plug or coil
Estimated Cost (DIY)
$20 - $500
Common Causes
How to Diagnose P0305
- 1Swap plug/coil
- 2Check injector
- 3Compression test
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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Related Symptoms
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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 4 is misfiring.
Cylinder 6 is misfiring. Only on 6+ cylinder engines.
Frequently Asked Questions
- Do V6 engines often misfire on cylinder 5?
- No specific cylinder is more prone. However, rear cylinders can be harder to service, leading to deferred maintenance.
- What if multiple specific cylinders misfire?
- If cylinders on the same bank misfire, check for a bank-specific issue like a failed coil pack, intake leak, or head gasket.
Related Repair Guides
If your vehicle has triggered P0305, these DIY repair guides may help: