P0356 Ford F150: A Comprehensive Guide to Understanding the Error Code

The P0356 error code in Ford F150 is a common issue that many drivers face. This error code is related to the ignition system of the vehicle and can be caused by several factors, including loose connections within the coil, malfunctioning wires, open wiring/driver circuit, and broken coil connectors. When this error code appears, it indicates that there is a problem with the ignition coil, specifically with the primary or secondary wiring circuits.

To diagnose the problem, drivers need to know what causes the P0356 error code in their Ford F150. In this guide, we will provide a complete overview of the error code, including its causes, symptoms, and possible solutions. We will also cover how to fix the error code and prevent it from happening again in the future. Whether you are a seasoned mechanic or a novice driver, this guide will help you understand the P0356 error code and how to address it.

What is P0356 Error Code?

P0356 is a diagnostic trouble code that is specific to Ford vehicles. It indicates that there is a problem with the ignition coil “F” primary or secondary circuit. This error code is often accompanied by P0306, which indicates a misfire in cylinder 6.

The ignition coil is responsible for providing the spark that ignites the fuel in the engine. The primary circuit of the ignition coil is responsible for delivering power to the coil, while the secondary circuit is responsible for delivering the high voltage spark to the spark plugs. If there is a problem with either of these circuits, it can cause the P0356 error code to be triggered.

The P0356 error code is often caused by a faulty ignition coil or a problem with the wiring or connections to the coil. It can also be caused by a problem with the PCM (powertrain control module), which is responsible for controlling the ignition system.

Causes of P0356 Error Code

Faulty Ignition Coil

The ignition coil is responsible for converting the battery’s low voltage into high voltage that is required to ignite the fuel in the engine. If the ignition coil is faulty, it can cause the P0356 error code. A faulty ignition coil can be caused by several factors, including:

• Loose connections within the coil
• Malfunctioning wires in your vehicle
• Open wiring/driver circuit
• Broken coil connectors

Wiring Issues

Poor wiring connections in the vehicle can also cause the P0356 error code. Wiring problems can occur due to several reasons, including:

• Short circuits
• Open circuits
• Bad grounds

These problems can cause the ignition coil to malfunction, leading to the P0356 error code.

Failed PCM

The Powertrain Control Module (PCM) is responsible for controlling the ignition system in the vehicle. If the PCM fails, it can cause the P0356 error code. A failed PCM can be caused by several factors, including:

• Short circuits
• Open circuits
• Overheating
• Water damage

If the PCM fails, it can cause the ignition coil to malfunction, leading to the P0356 error code.

Symptoms of P0356 Error Code

When the P0356 error code appears in a Ford F150, it can cause a range of problems. Here are the most common symptoms:

Engine Misfires

One of the most noticeable symptoms of a P0356 error code is engine misfires. This means that one or more cylinders in the engine are not firing correctly, which can cause a rough running engine and a loss of power. The misfires can also cause damage to the catalytic converter if left untreated, which can be costly to replace.

Poor Fuel Economy

Another symptom of a P0356 error code is poor fuel economy. When the engine is not firing correctly, it can cause the vehicle to use more fuel than normal. This can lead to a decrease in fuel efficiency and an increase in fuel costs over time.

Difficulty Starting the Engine

A P0356 error code can also cause difficulty starting the engine. This is because the ignition system is not working correctly, which can prevent the engine from starting. This can be frustrating for the driver and can lead to a breakdown if left untreated.

It is important to address a P0356 error code as soon as possible to prevent further damage to the vehicle. By identifying the symptoms of the error code, drivers can take action to fix the problem and get their vehicle back on the road.

Diagnosing P0356 Error Code

When the P0356 error code appears on a Ford F150, it is essential to diagnose the problem as soon as possible to prevent further complications. There are several ways to diagnose this error code, including using an OBD-II scanner, checking the ignition coil, and inspecting the wiring. Here’s a closer look at each of these methods:

Using OBD-II Scanner

The first step in diagnosing the P0356 error code is to use an OBD-II scanner. This tool can read the error code and provide more detailed information about the problem. It can also help identify any additional codes that may be related to the issue. To use an OBD-II scanner, follow these steps:

• Connect the scanner to the vehicle’s OBD-II port, usually located under the dashboard on the driver’s side.
• Turn the ignition key to the “On” position, but do not start the engine.
• Follow the scanner’s instructions to read the error code(s).
• Record the error code(s) and any other information provided by the scanner.

Checking Ignition Coil

The ignition coil is a crucial component of the engine’s ignition system. If it is malfunctioning, it can cause the P0356 error code to appear. To check the ignition coil, follow these steps:

1. Disconnect the negative battery cable to prevent electrical shock.
2. Locate the ignition coil, which is usually mounted on the engine block or valve cover.
3. Inspect the coil for any signs of damage, such as cracks or corrosion.
4. Use a voltmeter to test the voltage at the coil pack. The reading should be between 12 and 15 volts.
5. If the voltage is outside this range, the ignition coil may need to be replaced.

Inspecting Wiring

The wiring circuits that connect the ignition coil to the PCM can also cause the P0356 error code to appear. To inspect the wiring, follow these steps:

• Visually inspect the wiring for any signs of damage, such as frayed or broken wires.
• Use a multimeter to test the wiring for continuity and resistance.
• If any wires are damaged or have poor continuity or resistance, they should be repaired or replaced.
• Check the PCM connections for any signs of damage or corrosion.

Diagnosing the P0356 error code can be a challenging task, but by following these steps, you can identify the problem and take the necessary steps to fix it. If you are unsure about any of these steps, it is best to consult a professional mechanic for assistance.

Fixing P0356 Error Code

Replacing Ignition Coil

If the cause of P0356 is a malfunctioning ignition coil, replacing it is the best solution. The ignition coil is responsible for converting the battery voltage into high voltage required to create a spark in the spark plugs. A faulty ignition coil can cause misfires, rough idling, and reduced fuel efficiency. To replace the ignition coil, follow these steps:

1. Disconnect the battery to prevent electrical shock.
2. Locate the ignition coil that needs to be replaced. It is usually located on the engine block.
3. Disconnect the electrical connector from the ignition coil.
4. Remove the bolts that hold the ignition coil in place.
5. Install the new ignition coil and tighten the bolts.
6. Reconnect the electrical connector to the ignition coil.
7. Reconnect the battery and start the engine to test the new ignition coil.

Repairing Wiring Issues

If the cause of P0356 is a wiring issue, repairing the wiring is the best solution. A short circuit or open circuit in the wiring can cause the ignition coil to malfunction. To repair the wiring, follow these steps:

1. Disconnect the battery to prevent electrical shock.
2. Locate the wiring that needs to be repaired. Use a voltmeter to test the continuity of the wiring.
3. If there is a short circuit, repair the damaged wiring or replace it with a new one.
4. If there is an open circuit, find the break in the wiring and repair it or replace the wiring.
5. Reconnect the battery and start the engine to test the repaired wiring.

Replacing PCM

If the cause of P0356 is a faulty PCM, replacing it is the best solution. The PCM is the brain of the engine control system and controls various functions such as fuel injection, ignition timing, and emissions. A faulty PCM can cause various problems such as stalling, poor acceleration, and reduced fuel efficiency. To replace the PCM, follow these steps:

1. Disconnect the battery to prevent electrical shock.
2. Locate the PCM that needs to be replaced. It is usually located under the dashboard or in the engine compartment.
3. Disconnect the electrical connectors from the PCM.
4. Remove the bolts that hold the PCM in place.
5. Install the new PCM and tighten the bolts.
6. Reconnect the electrical connectors to the PCM.
7. Reconnect the battery and start the engine to test the new PCM.

Preventing P0356 Error Code

Regular Maintenance

Regular maintenance is one of the most effective ways to prevent the P0356 error code. The ignition system is a crucial component of the vehicle, and it requires regular maintenance to keep it in good condition. This includes replacing spark plugs, ignition coils, and wires at the recommended intervals. It is also important to keep the engine clean and free from debris, as this can cause damage to the ignition system.

Using Quality Parts

Using quality parts is another important factor in preventing the P0356 error code. It is important to use OEM or high-quality aftermarket parts when replacing ignition coils, spark plugs, and wires. Low-quality parts can cause damage to the ignition system and lead to the P0356 error code. It is also important to ensure that the parts are installed correctly, as improper installation can also cause the error code to appear.

Proper Driving Habits

Proper driving habits can also help prevent the P0356 error code. This includes avoiding harsh acceleration and braking, as well as avoiding excessive idling. Harsh acceleration and braking can cause damage to the ignition system, while excessive idling can cause the engine to overheat, which can also damage the ignition system.

Conclusion

Preventing the P0356 error code requires regular maintenance, the use of quality parts, and proper driving habits. By following these guidelines, drivers can help ensure that their ignition system remains in good condition and avoid the inconvenience and expense of dealing with the P0356 error code.