Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer noticed that the spark plug in cylinder number 5 isn't sparking for as long as it should. It's like when a light bulb flickers instead of staying on steadily.
The engine control module (ECM) monitors the duration of the spark in each cylinder. If it detects that the spark in cylinder 5 is shorter than expected, it triggers this code.
The P1305 code is set when the ECM detects that the spark duration for cylinder 5 is shorter than the predetermined threshold. This could be due to issues with the ignition coil, spark plug, or wiring related to cylinder 5.
• Engine misfire
• Rough idling
• Reduced engine performance
• Faulty ignition coil for cylinder 5
• Worn or damaged spark plug in cylinder 5
• Issues with the wiring or connectors to cylinder 5
ECM: Engine Control Module, the computer that controls engine functions.
Ignition Coil: A component that transforms battery voltage into the high voltage needed to create a spark in the spark plug.
• Use an OBD-II scanner to confirm the code.
• Inspect the ignition coil and spark plug for cylinder 5.
• Check the wiring and connectors for damage or corrosion.
• Replace the ignition coil for cylinder 5 if faulty.
• Replace the spark plug in cylinder 5 if worn or damaged.
• Repair or replace damaged wiring or connectors.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly replace spark plugs as per the maintenance schedule.
• Inspect ignition coils during routine maintenance.
• Keep the engine bay clean to prevent wiring damage.
Engine Performance
• Have the vehicle inspected by a professional if you notice misfires.
• Do not ignore the check engine light; it could lead to more serious issues.
Check with your vehicle manufacturer for warranty coverage on ignition components.
This code is typically associated with ignition system issues and has been commonly reported in vehicles with high mileage.
Moderate – Ignoring this issue can lead to more severe engine damage.
Driving with a misfire can cause damage to the catalytic converter and is not recommended.
• Engine running at idle
• Vehicle at operating temperature
The ignition coil and spark plug for cylinder 5 are located on the engine, typically on the passenger side for V-type engines.
Q: Can I drive with a P1305 code?
A: It's best to have it checked as soon as possible. Driving with a misfire can damage the catalytic converter.
Q: How can I prevent this code from appearing?
A: Regular maintenance, including replacing spark plugs and inspecting ignition components, can help prevent this issue.
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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.