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 has detected a problem with the electrical part of the ignition coil for one of the engine's cylinders. It's like when a flashlight doesn't turn on because the battery connection is loose.
The P2308 code indicates a malfunction in the secondary circuit of the ignition coil labeled as 'C'. This could be due to issues in the wiring, connectors, or the coil itself.
The ignition coil is responsible for transforming the battery's voltage into a much higher voltage needed to create a spark in the spark plug. The secondary circuit is the part of the coil that delivers this high voltage to the spark plug. A fault in this circuit can prevent the spark plug from firing, leading to engine misfires.
• Check Engine Light is on
• Engine misfires
• Poor fuel economy
• Rough engine idle
• Faulty ignition coil
• Damaged wiring or connectors in the ignition coil circuit
• Faulty spark plug
• ECM (Engine Control Module) malfunction
Ignition Coil: A component that transforms battery voltage into a high voltage to ignite the fuel-air mixture in the engine.
ECM: Engine Control Module, the computer that controls engine functions.
• Use an OBD-II scanner to confirm the P2308 code.
• Inspect the ignition coil C and its wiring for damage or disconnections.
• Test the ignition coil with a multimeter.
• Check the spark plug for wear or damage.
• Replace the faulty ignition coil.
• Repair or replace damaged wiring or connectors.
• Replace the spark plug if necessary.
• Reset the ECM and clear the code.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect ignition coils and wiring.
• Replace spark plugs according to the maintenance schedule.
• Keep the engine clean to avoid moisture buildup.
Engine Performance
• Do not ignore the Check Engine Light; have it diagnosed promptly.
• Avoid driving the vehicle with a misfire to prevent further damage.
• Consult a professional mechanic if unsure about the repair.
Check with your vehicle manufacturer for warranty coverage on ignition components.
P2308 has been a common code in vehicles with coil-on-plug ignition systems, particularly as they age and components wear out.
Moderate – While the vehicle may still be drivable, it can lead to further engine damage if not addressed.
Driving with a misfire can lead to increased emissions and potential engine damage, which may not comply with local emission laws.
• Engine running
• Warm engine temperature
The ignition coil is located on top of the engine, directly above the spark plugs.
Q: Can I drive with a P2308 code?
A: It's not recommended to drive for long periods with this code as it can cause engine damage.
Q: How can I prevent ignition coil issues?
A: Regular maintenance and inspections can help prevent issues. Replace spark plugs and coils as recommended.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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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.