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 it start and keep running. It's like when a flashlight's switch is broken, and it can't turn on the light.
The P0351 code indicates an issue with the primary circuit of the ignition coil 'A'. This means the coil isn't getting the right signals to work properly.
The ignition coil is responsible for converting the battery's low voltage to the high voltage needed to ignite the fuel in the engine. The P0351 code is triggered when the Engine Control Module (ECM) detects a malfunction in the primary control circuit of ignition coil 'A'. This can be due to an open circuit, short to ground, or short to voltage.
• Check Engine Light is on
• Engine misfires
• Poor fuel economy
• Faulty ignition coil
• Poor electrical connection
• Open or shorted ignition coil harness
ECM: Engine Control Module
Ignition Coil: A component that transforms the battery's voltage to a higher voltage needed to ignite the fuel.
• Use an OBD-II scanner to confirm the P0351 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 or connectors.
• Clear the code and test drive the vehicle.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect ignition components.
• Keep electrical connections clean.
• Use quality ignition parts.
Engine Performance
• Address this issue promptly to avoid further engine damage.
• Consult a professional mechanic if unsure about repairs.
Check with your vehicle manufacturer for warranty coverage on ignition components.
P0351 is a common code that has been reported across various makes and models, often due to ignition coil wear.
Moderate – Should be addressed soon to prevent drivability issues.
Driving with a misfiring engine can be unsafe and may lead to increased emissions.
• Engine running
• Code set after ECM detects fault in ignition coil circuit
The ignition coil is typically located on top of the engine, near the spark plugs.
Q: Can I drive with a P0351 code?
A: It's not recommended to drive for long with this code, as it can cause engine damage.
Q: How do I know if my ignition coil is bad?
A: Symptoms include engine misfires, poor fuel economy, and the Check Engine Light being on.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
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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.
View options on Amazon
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.