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P0305 is a diagnostic trouble code (DTC) for "Cylinder 5 Misfire Detected". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Cylinder 5 Misfire Detected
P0305 is a generic OBD-II code that the engine control module (ECM) detected a misfire on cylinder number 5 of the engine.
Scans codes and documents the freeze frame data in order to verify the problem
Clears the engine and ETC codes to verify concern comes back
Road tests to verify the misfire to cylinder 5
Removes cylinder 5 ignition coil or plug wire and checks for evidence of spark tracking on outside of coil or plug boot. Also looks for oil contamination from a leaking valve cover
Removes and checks the cylinder spark plug and replaces or switches to a different cylinder to see if misfire moves to the other cylinder
Checks cylinder compression if no ignition problems are found
Not switching the coil to a different cylinder and rescanning to see if the misfire moves to another cylinder to check if it is the coil that is bad.
Not switching one part at a time with a different cylinder to isolate the failed part.
A misfiring cylinder can cause the engine to run excessively rich and can damage the catalyst. The misfire will cause the engine to run rough and hesitate on acceleration resulting in decreased performance and fuel economy.
Replacing the faulty spark plug or replacing all spark plugs as a set if failure was due to a worn out plug.
Replacing the leaking valve cover gasket then replacing the failed coil, plug wires, and plugs.
Code P0305 is triggered when the crankshaft sensor does not get an acceleration of the crankshaft from cylinder number 5 power stroke indicating the cylinder is not contributing to engine power.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230 to have this issue resolved.