P0307
Cylinder 6 Misfire Detected
Powertrain Ignition System Cylinder 6 misfire detection 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

Cylinder 6 isn't firing properly, like a spark plug that keeps misfiring in one chamber of your engine. The engine computer detected the cylinder isn't contributing power on multiple combustion cycles.

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Symptoms You May Notice
3 known symptoms for this code
Rough idle or stumbling acceleration
Check Engine light illuminated
Noticeable vibration or shaking at stop lights
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors crankshaft speed variation using the crankshaft position sensor to detect misfires. When cylinder 6 fails to ignite properly, the crankshaft slows momentarily, triggering a misfire count. If misfire events exceed the threshold within a specific driving window, the fault code sets.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Crankshaft Acceleration Variance Smooth, consistent tooth timing Irregular deceleration on cylinder 6 combustion stroke
Misfire Count (per 1000 revolutions) 0-2 misfires 3+ misfires detected
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Spark plug for cylinder 6
Remove and inspect the spark plug; replace if worn, fouled, or gapped incorrectly.
2
Ignition coil pack for cylinder 6
Test coil output with a multimeter or swap with another cylinder coil to isolate the fault.
3
Fuel injector for cylinder 6
Clean or replace injector if fuel spray pattern is weak or clogged.