Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's engine has a problem with the fifth cylinder, which is like one of the 'rooms' where the engine makes power. It's not working right, so your car might shake or not run smoothly.
The engine's computer has detected that cylinder number 5 is not firing properly, causing a misfire.
P0305 indicates that the powertrain control module (PCM) has detected a misfire in cylinder 5. This can be due to a variety of reasons including ignition system issues, fuel delivery problems, or mechanical engine faults.
• Check Engine Light is on
• Engine runs rough
• Poor fuel economy
• Loss of power
• Car shakes or vibrates
• Faulty spark plug in cylinder 5
• Bad ignition coil for cylinder 5
• Fuel injector issue in cylinder 5
• Vacuum leak affecting cylinder 5
• Low compression in cylinder 5
PCM: Powertrain Control Module, the vehicle's engine computer.
Misfire: Failure of the air/fuel mixture in the cylinder to ignite at the proper time.
• Use an OBD-II scanner to confirm the code.
• Inspect the spark plug and ignition coil for cylinder 5.
• Check the fuel injector for cylinder 5.
• Perform a compression test on cylinder 5.
• Replace the spark plug for cylinder 5.
• Replace the ignition coil for cylinder 5.
• Clean or replace the fuel injector for cylinder 5.
• Repair any vacuum leaks.
• Address any mechanical issues causing low compression.
• OBD-II scanner
• Spark plug socket
• Compression tester
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly replace spark plugs.
• Maintain fuel system cleanliness.
• Perform routine engine maintenance.
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional.
• Avoid driving long distances if the car is running rough.
Check your vehicle's warranty to see if engine repairs are covered.
Cylinder misfire codes have been common since the introduction of OBD-II systems, often related to ignition or fuel system issues.
Moderate – Addressing this issue promptly can prevent further engine damage.
Ignoring engine misfires can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in park or neutral
Cylinder 5 is located in the engine block, position varies by engine type and manufacturer.
Q: Can I drive with a P0305 code?
A: It's not recommended to drive with a misfire, as it can cause further damage to the engine.
Q: What happens if I ignore a cylinder misfire?
A: Ignoring a misfire can lead to more serious engine damage and increased repair costs.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.