P0358 Code: Ignition Coil H Primary/Secondary Circuit Malfunction

The ignition coil or coils in the engine are in charge of supplying voltage to the spark plugs to ignite the combustion chamber’s air/fuel mixture. The vehicle will misfire if the ignition coil(s) do not perform reliably. P0358 is a generic trouble code that’s related to ignition coils.

What Does the P0358 Code Mean?

Diagnostic trouble code P0358 stands for “Ignition Coil H Primary/Secondary Circuit Malfunction.”

Modern engines use a coil on plug ignition system. In this type of system, the powertrain control module (PCM) controls the individual coil for each cylinder.

By placing the coil directly above the spark plug, it eliminates the need for spark plug wires. Each coil has at least two wires dedicated to it. One is a battery feed, which is typically supplied by the power distribution center, while the other wire is the PCM’s coil driver circuit.

To activate or deactivate the coil, the PCM grounds or ungrounds this circuit. The PCM checks for faults in the coil driver circuit.

A P0358 might be set if an open or short is detected in the driver circuit for coil #8. Depending on the vehicle, the PCM might also disable the fuel injector to the cylinder.

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

Note: The definition of code P0358 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0358 Code?

• Malfunctioning coil
• Circuit issues, such as a damaged wire or poor connection
• An issue with the PCM, such as software in need of an update

What are the Common Symptoms of the P0358 Code?

• Illuminated check engine light
• Engine misfire

How to Diagnose the P0358 Code

P0358 is a generic trouble code, so various vehicles can log it. But that doesn’t mean that there is a repair procedure that would work for all makes and models.

It’s best to leave the job to a certified mechanic. But if you’re confident you have the tools and knowledge to diagnose the issue yourself, you can do it on your own. Here is a video of what the diagnostic procedure for this code might involve:

How to Fix the P0358 Code

Fixing a P0358 code can be tricky, especially if you’re not familiar with the repair process. It’s why most people prefer to let licensed mechanics resolve the problem because they can ensure that all steps and protocols are followed properly.

However, if you believe you can solve the issue on your own, be sure you are well-informed before moving further. Keep in mind that there isn’t a universal fix that applies to all makes and models. So make sure you consult a vehicle-specific repair manual or online repair database before you get started.

Where to Get an Ignition Coil for Your Vehicle

One of the most common causes for a P0327 is a faulty ignition coil that needs to be replaced. Thankfully, finding the right ignition coil that’s compatible with your vehicle model is easy here at CarParts.com.

Going to brick-and-mortar stores is a thing of the past because you can conveniently get a new ignition coil from the comfort of your own home. Just type your vehicle’s make, model, and engine type in our vehicle selector to see a narrowed-down list of compatible parts. Our ignition coils are obtained from some of the industry’s most reputable brands, and our warehouses are conveniently located across the US. This means you’ll be able to receive your orders within just a few days regardless of where you live.

Don’t wait until your engine’s misfires worsen. Get OE-grade ignition coils for your vehicle here at CarParts.com now!