P0306 is a generic diagnostic trouble code (DTC) defined as “Cylinder 6 Misfire Detected.”
Your car’s Engine Control Module (ECM) or Powertrain Control Module (PCM) registers this code when it detects a misfire on cylinder number 6 of your engine.
Vehicles with internal combustion engines move when they ignite the air and fuel mixture inside the engine cylinder. The power generated through fuel combustion makes the cylinder pistons move up and down and rotate the crankshaft, which helps drive the wheels.
A misfire typically occurs when the ignition timing of your vehicle is off, causing the combustion reaction in the misfiring cylinder to fail. When that happens, the engine speed fluctuates, and the crankshaft position sensor (crank sensor) signals vary.
When your ECM detects this signal fluctuation, it logs the respective misfire code and activates the Check Engine Light.
Typically, the P0306 code is accompanied by a couple of telltale signs. These include:
If your vehicle’s ECM has registered the P0306 misfire code and you can see an illuminated or flashing Check Engine Light, you should stop driving immediately.
A misfire is a severe car malfunction. If ignored, a misfiring cylinder could lead to ignition failure, catalytic converter damage, and several drivability issues. Some of these repairs can be pretty expensive.
A misfire can also cause your engine to run rich, thereby decreasing your vehicle’s fuel efficiency.
A cylinder 6 misfire could be caused by a wide range of reasons, including a faulty ignition system, a worn spark plug failing to generate a high intensity spark or low engine compression.
Here are the common reasons for a misfire on cylinder number 6:
Several reasons could trigger a cylinder 6 misfire. So, an accurate diagnosis is essential to find the root cause and avoid expensive future repairs.
Here’s how your mechanic will diagnose the P0306 code:
Fixing this P0306 cylinder 6 misfire usually begins with an hour of diagnostic time, for which a mechanic may charge you $75-$150.
Based on the diagnosis, here are some of the repairs or replacements that your mechanic may suggest:
Here are the average cost estimates for some of the DTC P0306 repairs (including the labor charges):
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