The Mazda CX-5 is a reliable and popular SUV known for its performance and sleek design. However, even the most well-crafted vehicles can experience issues with their ignition coils. If you’re a proud owner of a Mazda CX-5 and have found yourself facing ignition coil problems, you’re not alone.
Numerous owners around the world have been suffering from Mazda CX-5 ignition coil issues, particularly, frequent coil failure, engine misfiring, and other associated issues. But what’s the cause behind such issues? And how do you know if your ignition coil is faulty?
To know all the facts, you have to stay with us till the end. Here. we’re going to explore the common signs and symptoms of ignition coil issues in the Mazda CX-5, explore their underlying causes, and provide expert insights on how to address these challenges effectively.
What Causes Ignition Coil Problems in Mazda CX-5?
Ignition coil problems in Mazda CX-5 can be caused by various factors. One common issue is overheating, which can occur due to the high temperatures generated within the engine compartment. This excessive heat can cause the ignition coils to degrade over time, leading to performance issues.
Also, moisture and corrosion are significant culprits behind ignition coil issues in Mazda CX-5 vehicles. Water infiltration into the engine bay or exposure to harsh environmental elements can accelerate corrosion on the ignition coils, affecting their functionality.
Regular maintenance practices such as inspecting for signs of water damage and ensuring proper sealing of engine components can help mitigate these issues and prolong the lifespan of the ignition coils in your Mazda CX-5.
Moreover, another factor that contributes to ignition coil issues in Mazda CX-5 is electrical faults. Any disruptions in the electrical system, such as faulty wiring or voltage spikes, can strain the ignition coils and lead to malfunctions.
A leaking spark plug tube in a Mazda CX-5 can lead to ignition coil issues, potentially causing damage and misfiring. The problem often stems from a defective seal in the valve cover of the spark plug tube, making replacing it with a new one the most effective solution.
Symptoms of Ignition Coil Problems in Mazda CX-5
When it comes to diagnosing ignition coil problems in the Mazda CX-5, drivers should be vigilant for specific symptoms that indicate potential issues. Some of the common symptoms are mentioned below:
- Engine misfire is one of the most obvious signs of ignition coil problems in Mazda CX-5. This can result in rough idling and decreased performance.
- Additionally, you may experience stalling or difficulty starting the vehicle.
- Another sign to look out for is a significant decrease in fuel efficiency, as faulty ignition coils can affect the combustion process.
- In some cases, there may be a noticeable reduction in engine power or acceleration, making it difficult to drive smoothly.
- Furthermore, you might observe that the check engine light illuminates on the dashboard, signaling potential issues with the ignition system.
Common Mazda CX-5 Ignition Coil Problems
Before we delve into our discussion regarding Mazda CX-5 ignition coil problems, one thing we should mention is that issues with the ignition coil often can be directly marked as the symptoms.
However, the internal factors can be more complex if we dig down the issues. So, in this portion, we’ll explore the most common issues reported by Mazda CX-5 owners.
1. Engine Misfire with DTC Code
In 2016, Mazda issued an official service bulletin addressing potential issues with certain vehicles. The bulletin highlighted symptoms such as reduced engine power, rough idling, and the illumination of the check engine light, accompanied by specific misfire-related diagnostic trouble codes (DTCs) including P0300:00, P0301:00, P0302:00, P0303:00, and P0304:00.
Mazda attributed these concerns to possible internal ignition coil failure resulting from significant temperature differentials between cold and warm environments. Fortunately, Mazda reassured customers that modifications had been made to the ignition coil production process to resolve this issue.
Notably, ignition coils are now sourced from two distinct suppliers, YUMEBISHI and MITSUBISHI. The problem is isolated to YUMEBISHI-produced coils. To differentiate between YUMEBISHI and MITSUBISHI coils, one should examine their lot numbers; YUMEBISHI coils feature four-digit lot numbers while MITSUBISHI coils have five digits.
Mazda has officially demonstrated a repair procedure to address the issue at hand. The first step involves confirming the customer’s concern and identifying any misfire-related Diagnostic Trouble Codes (DTCs) using the M-MDS system. Next, swap the ignition coils of the cylinder experiencing a misfire with one from a cylinder without issues.
If the misfire moves to the new cylinder, it indicates a faulty ignition coil and requires replacement as per the workshop manual instructions. If the misfire persists, other potential causes such as wiring harness or spark plug malfunctions should be investigated further. Subsequently, replace any defective ignition coils with modified versions specified in sections 01-18 of the workshop manual.
Additionally, inspect all non-defective coils for YUMEBISHI production before lot number 6328 (March 28, 2016). Any identified coils meeting these criteria should also be replaced with modified versions. Finally, confirm that the repair process has been successful through thorough verification procedures.
2. Frequent Ignition Coil Failure
Despite the past ignition coil issues and the technical service bulletin issued by Mazda, numerous CX-5 owners continued to experience ignition coil failures. Despite replacing faulty ignition coils, some owners reported needing to replace multiple coils due to ongoing issues.
The problem persisted even after initial replacements were made, highlighting a deeper underlying issue within the ignition system of these vehicles. Owners sought assistance from dealerships and independent mechanics to address the repeated ignition coil failures in their CX-5 vehicles.
The financial burden of replacing multiple coils added to the dissatisfaction and inconvenience experienced by affected owners. Some questioned the effectiveness of previous attempts to rectify the issue, leading to concerns about the long-term durability and quality of their vehicles.
P0300 Code after Spark Plug Replacement
Mechanics and dealerships often recommend replacing spark plugs as a common solution for ignition coil issues. Some Mazda CX-5 owners have experienced persistent P0300 trouble codes and illuminated check engine lights even after multiple plug and coil replacements.
These vehicles are particularly sensitive to ignition component quality, with low-cost coils from sources like Amazon typically proving unreliable. While tempting budget options exist on Amazon, the higher price of OEM coils reflects their superior performance. In such cases, Delphi ignition coils are proven to be effective and also recommended by Mazda themselves.
Addressing a P0300 code in an older CX-5 without proper diagnosis can lead to costly plug and coil replacements that may not resolve the issue. Misfires are commonly attributed to faulty plugs or coils, prompting some shops to skip detailed diagnostics in favor of immediate part replacement.
However, isolated P0300 codes in Mazda CX-5 models could also result from excessive carbon buildup on intake valves due to the engine’s GDI design lacking port injectors for valve cleaning assistance. DIY valve cleaning sprays offer a potential solution, but heavily carboned valves may require professional intervention for effective cleaning due to the limitations of consumer-grade products.
How to Fix Mazda CX-5 Ignition Coil Issues
To deal with any ignition coil-related issue in your Mazda CX-5, we have formulated a universal troubleshooting process. Here is the step-by-step process you can follow to fix Mazda CX-5 ignition coil issues:
- Begin by locating the ignition coil in your Mazda CX-5 engine compartment, typically found on top of the engine near the spark plugs.
- Use a socket wrench to carefully remove the bolts securing the ignition coil to the engine block.
- Gently disconnect the electrical connector attached to the ignition coil by pressing on the release tab and pulling it away.
- Inspect both the ignition coil and its wiring for any signs of damage or wear, such as cracks, fraying, or discoloration.
- If there are visible issues, replace the faulty ignition coil with a new one specifically designed for your Mazda CX-5 model.
- Secure the new ignition coil in place by reattaching and tightening the mounting bolts using a socket wrench.
- Reconnect the electrical connector to ensure a proper connection between the ignition coil and your vehicle’s electrical system.
- Double-check all connections and make sure everything is tightly secured before closing the hood of your Mazda CX-5.
- Start your vehicle and test for any abnormal engine behaviors or warning lights to confirm the successful resolution of the ignition coil issue.
DIY Mazda CX-5 Ignition Coil Replacement
Since replacing the ignition coil isn’t much difficult task, many owners seek a DIY approach. However, a simple mistake can lead to something more serious than the issue you’re dealing with. So, for those, who prefer DIY ignition coil replacement, we have structured the following process. Let’s see.
- Disconnect the negative battery terminal to prevent any electrical mishaps during the replacement process.
- Next, carefully detach the wiring harness connectors from each ignition coil and remove any retaining bolts securing them in place. Take note of the specific placement of each coil to ensure they are correctly reinstalled later. Gently lift out the old coils and discard them.
- Before installing the new ignition coils, it is recommended to apply dielectric grease to the connectors for improved connection and protection against moisture.
- Securely fasten the new coils in place using the retaining bolts and reconnect the wiring harness connectors. Finally, reattach the negative battery terminal and test start your Mazda CX-5 to ensure the proper functioning of the new ignition coils.
Final Words
Mazda CX-5 ignition coil problems are a common issue that owners may encounter. Owners need to be aware of the symptoms of a faulty ignition coil, such as engine misfiring and decreased acceleration.
Regular maintenance and prompt replacement of faulty ignition coils can help prevent more serious issues with the vehicle’s engine.
If you suspect your Mazda CX-5 is experiencing ignition coil issues, do not hesitate to seek professional assistance to ensure the safety and performance of your vehicle. Stay proactive in addressing any potential issues to keep your Mazda CX-5 running smoothly and efficiently.
