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 is having trouble talking to one of the parts that helps make the engine run. It's like one of the wires to a spark plug isn't working right.
The P0358 code indicates an issue with the ignition coil 'H' primary control circuit, either due to an open circuit or a fault in the control circuit.
The ignition coil is responsible for converting the battery's voltage to a much higher voltage needed to create an electric spark in the spark plugs. Each ignition coil is controlled by the car's engine control module (ECM) through a primary control circuit. Code P0358 is triggered when the ECM detects a malfunction in the primary control circuit of the ignition coil labeled 'H'.
• Check Engine Light is on
• Engine misfire
• Poor fuel economy
• Faulty ignition coil H
• Open or shorted wiring in the ignition coil circuit
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the ignition coil H and its wiring for damage or disconnection.
• Test the ignition coil H with a multimeter to ensure it's functioning properly.
• Replace the faulty ignition coil H.
• Repair or replace damaged wiring in the ignition coil circuit.
• Replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain ignition components.
• Ensure proper installation of ignition coils.
• Use quality ignition parts.
Engine Performance
• Have a professional mechanic inspect the vehicle if unsure.
• Avoid driving the vehicle excessively until the issue is resolved.
Check with the vehicle manufacturer for specific warranty coverage on ignition components.
This code has been commonly associated with vehicles using individual coil-on-plug ignition systems.
Moderate – While the vehicle may still be drivable, ignoring the issue can lead to more serious engine problems.
Driving with a misfire can cause damage to the catalytic converter and increase emissions, which may not comply with local regulations.
• Engine running
• Vehicle at operating temperature
The ignition coil is located on top of the engine, above the spark plugs.
Q: Can I drive with a P0358 code?
A: It's not recommended to drive for long periods with this code, as it can cause further engine damage.
Q: How do I know which coil is 'H'?
A: Refer to the vehicle's service manual for the specific coil labeling.
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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.
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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.