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 there's a problem with the part of your car that helps make the spark to start the engine. It's like when a spark plug in a toy car doesn't work right.
The P2305 code indicates an issue with the secondary circuit of ignition coil B, which is responsible for generating the high voltage needed to ignite the air/fuel mixture in the engine's cylinders.
The ignition coil is a critical component in the ignition system, converting the battery's low voltage to the high voltage needed to create an electric spark in the spark plugs. The P2305 code specifically refers to a malfunction in the secondary circuit of ignition coil B, which could be due to wiring issues, a faulty coil, or a problem with the powertrain control module (PCM).
• Engine misfire
• Rough idling
• Reduced engine performance
• Faulty ignition coil B
• Damaged or corroded wiring or connectors
• Faulty powertrain control module (PCM)
Ignition Coil: A component that transforms low voltage from the battery to high voltage needed for spark plugs.
PCM: Powertrain Control Module, the computer that controls engine and transmission functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the ignition coil B and its wiring for damage.
• Test the ignition coil B with a multimeter.
• Replace the faulty ignition coil B.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect ignition components.
• Ensure proper maintenance of the ignition system.
• Avoid moisture exposure to ignition components.
Engine Performance
• Do not ignore engine misfires; they can lead to more severe engine damage.
• Seek professional assistance if unsure about the repair process.
Repairs may be covered under the vehicle's powertrain warranty. Check with your manufacturer.
The P2305 code has been commonly reported in vehicles with high mileage or inadequate maintenance of the ignition system.
Moderate – Addressing this code promptly can prevent further engine damage.
Driving with a misfiring engine can be unsafe and may cause legal issues if emissions are affected.
• Engine running
• Vehicle at operating temperature
The ignition coil B is typically located on the engine, near the spark plugs it serves.
Q: Can I drive my car with a P2305 code?
A: It's not recommended to drive for long periods with this code, as it can cause engine damage.
Q: How do I know if my ignition coil B is bad?
A: Symptoms include engine misfires, rough idling, and reduced performance. A multimeter test can confirm the issue.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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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.