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 circuit that controls one of the coils that help the engine start. It's like when a flashlight doesn't turn on because the battery connection is loose.
The P2306 code indicates that the voltage in the ignition coil C's primary control circuit is lower than expected.
The ignition coil is responsible for converting the battery's low voltage to the high voltage needed to create an electric spark in the spark plugs, which ignites the fuel. The 'primary control circuit low' means the voltage in the control circuit for ignition coil C is below the threshold set by the manufacturer, which could lead to misfires or engine performance issues.
• Engine misfire
• Rough engine idle
• Check Engine Light on
• Faulty ignition coil
• Wiring issues in the ignition coil circuit
• Faulty Powertrain Control Module (PCM)
Ignition Coil: A component that transforms the battery's voltage to a higher voltage needed to ignite the fuel.
PCM: Powertrain Control Module, the vehicle's main computer that controls engine and transmission functions.
• Use an OBD-II scanner to verify the code.
• Inspect the ignition coil and its wiring for damage.
• Test the ignition coil with a multimeter.
• Replace the faulty ignition coil.
• Repair or replace damaged wiring.
• 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 system components.
• Ensure proper maintenance of electrical connections.
• Use high-quality ignition parts.
Engine Performance
• Do not ignore the Check Engine Light.
• Get the vehicle inspected by a professional if unsure.
• Avoid driving long distances with this issue.
Check with the vehicle manufacturer for warranty coverage on ignition system components.
This code has been associated with ignition coil failures in various vehicle models over the years.
Moderate – It should be addressed soon to avoid potential engine performance issues.
Driving with a misfiring engine can lead to increased emissions and potential damage to the catalytic converter.
• Engine running
• Vehicle at operating temperature
The ignition coil is typically located on the engine, near the spark plugs.
Q: Can I drive with a P2306 code?
A: It's not recommended to drive for long periods with this code as it can lead to engine performance issues.
Q: How can I prevent ignition coil problems?
A: Regular maintenance and using high-quality parts can help prevent issues with ignition coils.
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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.