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 found a problem with the electrical circuit that controls one of the car's ignition coils, specifically the one labeled 'D'. It's like a light switch that's not working properly, so the light (or in this case, the engine) can't turn on correctly.
The P0354 code is triggered when the Powertrain Control Module (PCM) detects a malfunction in the ignition coil 'D' primary control circuit.
The ignition coil 'D' primary control circuit is responsible for controlling the ignition coil, which generates the spark necessary to ignite the air/fuel mixture in the engine's cylinders. An open circuit or a fault in this circuit can prevent the coil from firing correctly, leading to misfires and engine performance issues.
• Check Engine Light is on
• Engine misfires
• Poor fuel economy
• Faulty ignition coil
• Open or shorted wiring in the ignition coil circuit
• Faulty PCM
PCM: Powertrain Control Module, the vehicle's engine control unit.
Ignition Coil: A component that converts battery voltage into a high voltage spark to ignite the engine's air/fuel mixture.
• Use an OBD-II scanner to confirm the code.
• Inspect the ignition coil and its wiring for damage or disconnection.
• Test the ignition coil with a multimeter to check its resistance.
• Replace the faulty ignition coil.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-150
• Toyota Camry
• Honda Accord
• Regularly inspect ignition system components.
• Replace spark plugs and coils at recommended intervals.
• Keep the engine clean to prevent corrosion.
Engine Performance
• Have the vehicle inspected by a qualified technician.
• Avoid driving the vehicle if experiencing severe misfires.
Check your vehicle's warranty coverage for ignition system components.
The P0354 code has been commonly reported in vehicles with high mileage or those that have not had regular ignition system maintenance.
Moderate – While the vehicle may still be drivable, ignoring the issue can lead to more severe engine damage over time.
Driving with a misfiring engine can lead to increased emissions and potential engine damage. Address the issue promptly.
• Engine at operating temperature
• Vehicle in a safe location for testing
The ignition coil is typically located on top of the engine, near the spark plugs.
Q: Can I drive my car with a P0354 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, including spark plug and coil replacements, can help prevent issues.
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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.