Error Code P0354: What It Means & What To Do?

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The P0354 fault code can be defined as Ignition Coil “D” Primary/Secondary Circuit Malfunction.

It is the ignition system which would convert the battery voltage into the high voltage which is used to ignite the cylinder air/fuel mixture. The side of the system which provides low voltage is called the primary circuit. This would include the battery, ignition switch, primary coil winding, crankshaft sensor as well as ECU. On the other hand, the high voltage side of this system is known as secondary circuit. In the modern vehicles, it would include the coil pack as well as the spark plugs. The low primary circuit voltage is converted into the high secondary voltage with the help of coil pack which is needed to fire the plugs. The coil pack is generally a transformer which contains coils of wire inside it. In the primary side there are hundred turns of wire while the secondary side has thousands. Current would be then applied to the primary side of the coil, which would thus create a magnetic field around the winding. The current is then interrupted with the help of a switching device which is generally the PCM.

This would cause the magnetic field to collapse, inducing the voltage into the winding. Similarly, the collapsing magnetic field would create a voltage in the secondary winding. Since there are many more turns of wire in the secondary winding, then the output voltage would be increased to thousands of volts. This would be enough to ignite the spark plugs.

Do you want to learn more about this fault code? This fault code would start indicating that the powertrain control module has detected a defect in the primary or secondary circuit of one or more ignition coils. A lot of OBD equipped vehicles utilize a “coil on plug” system to provide ignition spark. Now in this system, an ignition coil is secured to the engine in a way which would allow for the use of a small spark plug wire. Every ignition coil is controlled electronically by the powertrain control module.

What causes this problem with the Ignition Coil “D” Primary/Secondary Circuit Malfunction?

• The manifold vacuum might be leaking
• Defaults in the idle air control valve or electronic body
• The electronic body might be defective
• One or more spark plugs might be quirky
• Malfunctioning ignition coil
• Some faults in the idle air control valve
• There can be a carbon build up in the throttle body air passages

1. Ignition Coil - There can be some issues with the Ignition Coil due to which you may see P0354 code appearing over and over again. Visit us to buy best quality Ignition Coil online.
2. Powertrain Control Module - A lot of issues can arise do to defective Powertrain Control Module. Did you just see P0354 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Engine Control Module - Faulty Engine Control Module can be the reason why P0354 code is flashing. Visit us to purchase top notch Engine Control Module online.
4. Fuel Ignition System - Fuel Ignition System parts need full care. A faulty Fuel Ignition System parts can be a reason behind the flashing up of P0354 code.
5. Engine Wiring Connector - OBD Code P0354 can appear because of faulty Engine Wiring Connector.
6. Spark Plug - There can be some issues with the Spark Plug due to which you may see P0354 code appearing over and over again. Visit us to buy best quality Spark Plug online.
7. Electronic Control Unit - Are you facing some faults in your Electronic Control Unit? Don’t worry and get them replaced or else P0354 code can turn up.
8. Throttle Body - Common cause behind this P0354 error code can be some fault in Throttle Body. So it will be a good decision to replace them now.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• The malfunction indicator lamp can start appearing
• There can be lack of power in the engine, especially under heavy load
• Car engine may idle roughly
• Engine might misfire on acceleration
• There can be hard to start condition of the engine
• Issue of engine hesitation

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• Restore the Powertrain Control Module
• The faulty ignition coil should be replaced
• If you find out that there are some faults in the wiring harness, then it should be repaired or replaced as per the need
• The leakage in the vacuum should be repaired carefully
• The spark plugs and spark plug wiring should be replaced

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of fusion, wiring diagram, battery connectors, fuse and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

IF the P0354 code is stored, then it would indicate that the PCM is not receiving the proper signals from the ignition coil when the vehicle is in operation. This can be indicative of problems with either the primary computer side of the ignition coil or the secondary spark plug side of the coil.

The cause of the code should be verified and it would require an OBD-II scanner and several tests. A test drive to attempt to reproduce the situation in which the code was stored can also be helpful, so long as the mechanic pays close attention to the throttle position, engine cadence, road speed, and engine load. If you find out that vehicle is misfiring, the code will generally be verified, and the mechanic can continue with diagnostic steps to determine the cause of the problem, fix it, clear the code, and then carefully retest it.

Common Mistakes When Diagnosing The P0354 Code

• Replacing the ignition coil when cause of the malfunction was a leakage in the vacuum
• A lot of people might replace the spark plugs when in reality the issue can be leakage in the vacuum