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 is a problem with one of the car's spark plug coils. It's like a part that helps the car start is not working right.
The engine control module (ECM) has detected a malfunction in the ignition coil circuit for cylinder G.
The P0357 code indicates that the ECM has found an issue with the primary control circuit of the ignition coil labeled 'G.' This could mean there is an open circuit, a short, or another issue preventing the coil from receiving the proper signals.
• Check Engine Light is on
• Engine misfires
• Rough engine idle
• Faulty ignition coil
• Open or shorted ignition coil wiring
• Poor electrical connection in the ignition coil circuit
ECM: Engine Control Module
Ignition Coil: A component that transforms battery voltage into a higher voltage needed to create a spark in the engine.
• Use an OBD-II scanner to confirm 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.
• Ensure all connections are secure and corrosion-free.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect ignition system components.
• Replace spark plugs and coils as recommended by the manufacturer.
• Ensure proper maintenance of engine electrical systems.
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Avoid driving the vehicle excessively until repaired.
Check with your vehicle's manufacturer for warranty coverage on ignition system components.
P0357 has been a common code for vehicles with coil-on-plug ignition systems, particularly as vehicles age and components wear out.
Moderate – Ignoring this issue can lead to more severe engine problems.
Driving with a malfunctioning ignition coil can lead to increased emissions and potential engine damage.
• Engine running
• Warm engine
The ignition coil is typically located on top of the engine, near the spark plugs.
Q: Can I drive with a P0357 code?
A: It's not recommended to drive for long periods with this code, as it can cause engine damage.
Q: How do I know which coil is 'G'?
A: Refer to your vehicle's service manual to identify the coil labeled 'G.'
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.