Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the part of the car that makes the spark for the engine in cylinder number 3. It's like when a light bulb doesn't work because the wire is broken or not connected properly.
The engine control module (ECM) has detected a problem with the electrical circuit of the ignition coil for cylinder 3. The circuit is showing high resistance or no resistance at all.
P3315 indicates that the ECM has detected an abnormal resistance level in the ignition coil circuit of cylinder 3. This could be due to an open circuit, short circuit, or a faulty ignition coil. The ignition coil is responsible for converting the battery's low voltage to the high voltage needed to create a spark in the spark plug.
• Engine misfire
• Check Engine Light illuminated
• Rough engine idle
• Faulty ignition coil for cylinder 3
• Open or shorted wiring in the ignition coil circuit
• Poor connection at the ignition coil connector
Ignition Coil: A component that converts the battery's voltage to a higher voltage needed for spark plugs.
ECM: Engine Control Module, the computer that manages engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the ignition coil and its wiring for cylinder 3.
• Test the ignition coil's resistance with a multimeter.
• Replace the faulty ignition coil.
• Repair or replace damaged wiring in the ignition coil circuit.
• Ensure all connections are secure and corrosion-free.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford Focus
• Regularly inspect ignition system components.
• Ensure connections are tight and corrosion-free.
• Replace ignition coils at recommended intervals.
Engine Performance
• Do not ignore the Check Engine Light.
• Have a professional inspect the ignition system if unsure.
• Regular maintenance can prevent such issues.
Check with the vehicle manufacturer for specific warranty coverage on ignition components.
P3315 is a relatively uncommon code, typically associated with specific ignition system failures.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with an engine misfire can lead to increased emissions and potential engine damage.
• Engine running
• Warm engine temperature
The ignition coil for cylinder 3 is typically located on top of the engine, above the corresponding cylinder.
Q: Can I drive my car with a P3315 code?
A: It's not recommended to drive for long 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 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.