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Code P0354: Meaning, Causes, Fixes, FAQs

October 15, 2021

What does the trouble code P0354 mean?
And is it safe to drive with an active P0354 error code?

In this article, we’ll answer the above questions and go over all you need to know about DTC P0354. We’ll go over its causes, symptoms, and fixes. We’ll then mention the easiest solution to the P0354 trouble code.

As a bonus, we’ll also answer five FAQs associated with code P0354.

This Article Contains:

Let’s get started.

What Is Code P0354?

Code P0354 is defined as “Ignition Coil D Primary or Secondary Circuit Malfunction”. 

It’s a generic diagnostic trouble code (DTC), which essentially means that this code points to the same issue in all vehicles irrespective of make and model. However, the diagnosis and fixes for the error code will depend on the make and model of your vehicle.

But what exactly is this fault code saying about your car? 

What Does Code P0354 Mean?

Code P0354 indicates that your powertrain control module (PCM) or engine control module (ECM) has detected an issue with the primary or secondary circuit in ignition coil ‘D’ — the coil used on cylinder number 4 (cyl #4) of your engine.

Here, the last digit of this error code (‘4’) essentially refers to the cylinder number where the issue has occurred.

By that logic, an issue with the ignition coil on cylinder number 1 would trigger the error code P0351. Similarly, problems with the ignition coil C on cylinder number 3 (cyl #3) could trigger the DTC P0353.

Now that you know what code P0354 means, let’s go over the possible causes of this diagnostic trouble code:

What Causes The P0354 Error Code?

Several factors can commonly trigger the fault code P0354, including a:

Next, we’ll take a look at some symptoms associated with the P0354 trouble code.

What Are The Common Symptoms Of Code P0354?

Here are six symptoms that could indicate a code P0354 issue:

When you notice any of the above symptoms, you’re potentially dealing with a P0354 DTC.

Now, the question is: should you be worried? 
Let’s find out.

Is The P0354 Code Critical?

In short, yes.

Remember, code P0354 gets logged when proper ignition doesn’t occur in cylinder number 4.

As a result:

  1. The other cylinders in your car engine must work harder to make up for the power lost due to improper ignition.
  2. Your car’s engine will start to misfire intermittently, which can damage or clog the catalytic converter.
  3. You may experience drivability issues that can compromise your road safety.

Essentially, if your car throws the P0354 trouble code, request a mechanic’s help ASAP.

Next, we’ll describe how professional mechanics usually diagnose the fault code P0354:

How Is The Fault Code P0354 Diagnosed?

Although code P0354 is a generic DTC, the diagnosis and troubleshooting process will differ based on your vehicle’s model, make, and year.

To diagnose what caused the code P0354, a mechanic would:

Now that you’ve been introduced to how the code P0354 diagnosis is performed, we’ll tell you how this error code is usually fixed.

How Is The P0354 Code Fixed?

Since several factors can trigger the code P0354, the fixes will depend on what causes the code in the first place.

To fix the P0354 diagnostic trouble code, the mechanic may:

That’s a lot of potential fixes — wondering if there’s an affordable and reliable way to get the P0354 code fixed?

The Easiest Solution To Trouble Code P0354

Correctly diagnosing and fixing the misfire code P0354 requires a skilled and experienced mechanic.

Moreover, when hiring a mechanic, you’ll also need to confirm that they:

But where do you find experienced mechanics who meet these criteria?
The answer is RepairSmith — a convenient and reliable mobile auto repair service that can come to your driveway to fix car issues!

How much is it going to cost you?

Generally, RepairSmith charges between $95 and $150 to diagnose the OBD error code, depending on your location. And when you decide to continue with RepairSmith to fix the error code, we’ll add this cost to your repair cost.

The repair cost can vary based on which part is acting up and triggering the code P0354.

To give you some idea, if it’s your ignition coil that triggered the P0354 code and you need a replacement, you can expect to pay around $240-$270 for repairs.

For a more accurate estimate, just fill this online form.
Next, we’ll answer some frequently asked questions about the misfire code P0354:

5 Code P0354 FAQs

Here are answers to five commonly asked questions associated with code P0354:

1. How Is The Code P0354 Triggered?

Most modern engines use a coil on plug (COP) ignition system. 

Here, each cylinder has an individual ignition coil above the spark plug, controlled by the ECM or PCM. 

The ECM or PCM constantly monitors the COP driver circuit (aka coil driver circuit). And when there’s an issue with the coil driver circuit, the ECM or PCM logs a circuit malfunction error code. Moreover, in some vehicles, the PCM may also shut down your vehicle’s fuel injector.

How does the ECM or PCM know that there’s a fault in the coil driver circuit?
Every ignition coil in your car has a primary coil winding (near the ignition switch) and a secondary coil winding (near the spark plug).

When the primary coil winding gets triggered by the ECM or PCM, it creates a high voltage spark in the coil’s secondary wiring (winding). Since the ECM or PCM triggers the primary coil winding, it can monitor the voltage spark produced in the primary winding wire.

If for some reason, the ECM or PCM doesn’t detect a voltage spark in the primary wiring of ignition coil D, it logs the error code P0354.

2. What Is An Ignition Coil?

An ignition coil is an induction coil that transforms a low voltage (a few volts) at the primary winding wire into a high voltage (thousands of volts) on the secondary winding wire. This high voltage is delivered to the spark plug used on your engine cylinder.

3. What Is A Coil Pack?

A coil pack is an electronically controlled set of ignition coils regulated by the ECM or PCM in your car. This component builds up electrical energy and then releases it via the spark plug cables in your vehicle’s ignition system.

4. What Is A Spark Plug?

A spark plug is a small device that produces an electric spark using the high voltage generated by the secondary wiring (secondary circuit) of the ignition coil. The spark created by the spark plug ignites the air-fuel mixture in your engine, resulting in combustion. 

It’s this energy that powers your car.

Moreover, the spark plug may also function as a heat exchanger by transferring the heat generated in the engine to the vehicle’s cooling system.

5. What Are The ECM And PCM?

ECM is the short form of ‘engine control module’. And PCM is the short form of ‘powertrain control module’.

Although many people use these technical terms interchangeably when referring to the vehicle’s computer, there are significant differences between the two.

The ECM only controls specific aspects of the engine, such as its ignition timing, throttle position, and more.

In contrast, the PCM usually oversees and controls all vehicle functions, including the transmission system. For example, the PCM controls your engine timing, gear transmission, fuel injector operation, etc.

Closing Thoughts

Code P0354 in an OBD-II scan tool indicates an issue with the ignition process in cylinder number 4 (cyl #4) of your engine. It can result in engine misfire issues and drivability problems, potentially compromising your road safety.

If you’re looking for a reliable and hassle-free solution to this, simply reach out to RepairSmith. Our ASE-certified mechanics will come to where you are for all vehicle repair, service, and maintenance needs.