P0356 Code: Ignition Coil F Primary / Secondary Circuit Malfunction

If you’re having trouble figuring out what code P0356 means, you’ve come to the right place.

What Does the P0356 Code Mean?

Diagnostic trouble code (DTC) P0356 stands for “Ignition Coil F Primary/Secondary Circuit Malfunction.” If the PCM perceives a possible problem in one of the ignition coils or if it loses control of the circuit, it logs error code P0356.

To understand how this code is set, you can read our technical discussion about the primary and secondary windings of ignition coils here.

Since the ECM/PCM is triggering the primary of each ignition coil or each pair of coils, it has the ability to watch the voltage spike created by the primary winding each time it triggers the secondary winding, and if the ECM/PCM doesn’t see the primary voltage spike, it knows there is a problem of some kind with the primary and possibly the secondary elements of the coil or coil pack.

If the secondary part of the ignition coil is shorted out, the primary spike will be weak as a result. That’s when it typically sets the P0356 code if the fault is on cylinder #6.

You may also watch this video to understand how ignition coil works:

Note: The definition of code P0356 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0356 Code?

P0356 is a generic code, so it can have several triggers. Here are the most common:

• Defective ignition coil
• Wiring issue
• Poor connection
• Faulty PCM

What are the Common Symptoms of the P0356 Code?

You may notice the following symptoms if your vehicle has logged the code P0356:

• Check engine light is active
• Poor engine performance
• Engine misfire
• Poor fuel mileage

How to Diagnose the P0356 Code

Prevent further complications by addressing an engine code P0356 right away. However, obtaining an accurate diagnosis can prove difficult as the code shares common triggers and symptoms with other DTCs. All vehicles are built differently, so the diagnostic steps will also vary depending on their manufacturer.

For instance, the procedure for diagnosing a P0356 on a Toyota may be different from testing for the same code on a Ford. For the appropriate steps, always consult your vehicle’s repair manual. If you decide that DIY auto repair is not for you, you can always seek the help of a mechanic.

How to Fix the P0356 Code

Code P0356 may be logged in vehicles of varying makes and models, so you should always refer to repair information specific to your vehicle for the appropriate repair steps. If you aren’t confident in your automotive know-how, it may be best to leave the job to a mechanic.

However, if you’re set on resolving this code on your own, make sure your automotive knowledge is up to date. Refer to a repair manual or an online repair database to learn how to resolve code P0356.

Where to Get New Ignition Coils to Solve Code P0356

Issues that come with a logged P0356 make driving a hassle and could even cost you more money in the long run. So, if you’ve identified that a defective ignition coil triggered the code, it’s best to replace it immediately. Thankfully, you can find and order what you need with just a few clicks at CarParts.com.

Use our vehicle selector to check out our list of ignition coils that match your ride’s specifications. Simply enter the details of your car, truck, or SUV into the tool. Then, use the search filters to find the ignition coils that match your preferred brand, price, and more.

All our products come with a low-price guarantee to help you get the best value for your money. If you have any questions, you can reach our customer service team anytime via our toll-free hotline.

Shop for new ignition coils today to clear the P0356 code in no time!