Troubleshooting P0351 Ignition Coil A Primary Secondary Circuit Malfunction

P0351 is an OBD-II Diagnostic Powertrain (P) Trouble Code that indicates a malfunction in the ignition coil ‘A’ primary/secondary circuit. This code may be seen with other codes such as P0300, P0301 and P0302.

The primary/secondary circuit of the ignition coil is responsible for providing the spark that ignites the fuel in the combustion chamber. When this code is stored, it means there is an issue with the primary and secondary circuits not working correctly. This can be caused by a wiring issue, bad spark plug or ignition coil, or a bad connection between them.

Common symptoms associated with this code include: engine misfire, decrease in fuel economy, poor acceleration, and an illuminated Check Engine Light. The best way to diagnose this code is to use a professional grade scan tool and check for any other codes that may be present along with P0351. If any are found they should be addressed first before focusing on the P0351 code itself.

Once all other codes have been addressed you can begin to focus on diagnosing the P0351 code itself. This will involve checking all wiring harnesses connected to the ignition coils, testing all components involved in the primary/secondary circuit (spark plugs, wires, etc.), and replacing or repairing any parts that are found to be faulty or damaged.

Automobile: P0351 Ignition Coil A Primary Secondary Circuit Malfunction

Ignition coil issues can lead to poor performance, engine misfire, and the dreaded check engine light. But what exactly causes the P0351 ignition coil A primary secondary circuit malfunction? Let’s explore the common causes and methods of diagnosing and repairing this issue in automobiles.

Causes of Ignition Coil A Primary Secondary Circuit Malfunction

The two most common causes for this malfunction are electrical and mechanical issues. Electrical issues include wiring problems, faulty connections, and damaged components. Mechanical issues could be caused by vacuum leaks or clogged fuel injectors.

Diagnosing Ignition Coil A Primary Secondary Circuit Malfunction in Automobiles

The first step to diagnosing an ignition coil issue is a visual inspection of the engine compartment components as well as any wiring or connections. After that, a computer scan should be done to isolate the problem area for further diagnosis.

Repairing Ignition Coil A Primary Secondary Circuit Malfunction in Automobiles

Once the source of the problem has been identified, it can be repaired or replaced as needed. Wiring problems may need to be re-routed or replaced. Connections should be checked and tightened if necessary. Damaged components such as spark plugs should be replaced with new ones that are compatible with your vehicle’s make and model. Vacuum leaks should be patched up with silicone sealant, while fuel injectors can typically be cleaned out with a fuel injector cleaner solution or professional cleaning service. With these repairs completed, you should have your vehicle running smoothly in no time!

Automobile: P0351 Ignition Coil A Primary Secondary Circuit Malfunction

P0351 is a generic code that can be triggered by many different malfunctions in the ignition coil A primary secondary circuit. This code indicates that the voltage signal from the primary coil of the ignition coil A is not being detected in the secondary circuit, or vice versa. This code is especially common in vehicles with distributor-less ignition systems (DIS), as these systems rely on multiple ignition coils to fire each spark plug. When this code is triggered, it can cause misfires, rough idling, and decreased fuel economy. In order to fix this problem and restore optimal performance, it’s important to identify the root cause of the malfunction and address it accordingly.

Diagnosis of P0351 Ignition Coil A Primary Secondary Circuit Malfunction

In order to diagnose P0351, technicians usually start by visually inspecting all related components for signs of damage or corrosion. They may also use a specialized scanner tool to check for any fault codes in the vehicle’s computer system. If any faults are found, technicians can then use a multimeter to test each component’s electrical resistance values and determine if they are within manufacturer specifications. Additionally, they may need to check for continuity between circuits using an oscilloscope.

Once all relevant tests have been completed and any faults have been identified and repaired, technicians can then perform a road test in order to ensure that all components are functioning properly. If any issues persist after this point, further investigation will be necessary in order to identify and resolve the root cause of the problem.

Replacing Components

When troubleshooting P0351 ignition coil A primary/secondary circuit malfunctions, one of the most common solutions is to replace both the ignition coils and spark plugs with new ones. This is because over time both components can become worn down due to heat and vibration from regular engine operation which can lead to their eventual failure. Additionally, spark plugs may become fouled due to improper air/fuel mixture or carbon buildup which can prevent them from firing correctly leading to misfires or other performance issues.

When replacing these components it’s important that technicians make sure that they are using parts that are specified by their vehicle manufacturer for optimal performance as well as durability over time. Additionally, any replaced parts should be checked for proper installation as even small errors during installation can lead to further issues down the line such as engine misfire or stalling problems.

Service and Inspection

In addition to replacing worn out components it’s also important that technicians perform regular service inspections on vehicles with this type of issue in order to ensure optimal performance over time. During these inspections technicians will typically check for signs of wear or damage on all related components including spark plugs, wires, connectors and other related parts such as fuel injectors and oxygen sensors if applicable. Additionally they may also check for proper electrical connections between each component as loose connections or faulty wiring can lead to issues with voltage signals being sent between circuits which can trigger this type of fault code in some cases.

Cost of Repair for Ignition Coil A Primary Secondary Circuit Malfunction in Automobiles

The cost of repair for P0351 ignition coil A primary/secondary circuit malfunctions will vary depending on several factors including diagnosis time spent by technicians as well as cost of replacement parts used during repair work. Generally speaking labor costs tend to range anywhere from $50 – $150 depending on how long it takes technicians to diagnose and repair the issue while parts costs tend range anywhere from $50 – $200 depending on what specific components need replacing during repair work such as spark plugs or coils themselves etc..

Preventative Maintenance for Ignition Coil A Primary Secondary Circuit Malfunction in Automobiles

In order protect against similar issues occurring again over time it’s important that owners take steps towards performing regular preventative maintenance work on their vehicles such as changing spark plugs at least every 30k miles or having their fuel injectors cleaned at least once every year etc.. Additionally owners should also make sure that all related wiring harnesses are properly connected at all times as loose connections between circuits could potentially lead trigger this type fault codes again down the line if left unchecked long enough

FAQ & Answers

Q: What is an Ignition Coil A Primary Secondary Circuit Malfunction?
A: An Ignition Coil A Primary Secondary Circuit Malfunction is a common issue that can cause poor performance, engine misfires, and the check engine light to be illuminated in automobiles.

Q: What are some potential causes of Ignition Coil A Primary Secondary Circuit Malfunction?
A: Potential causes of an Ignition Coil A Primary Secondary Circuit Malfunction include electrical issues such as faulty wiring and connections or damaged components, as well as mechanical issues such as vacuum leaks or clogged fuel injectors.

Q: How can I diagnose an Ignition Coil A Primary Secondary Circuit Malfunction?
A: An Ignition Coil A Primary Secondary Circuit Malfunction can be diagnosed through visual inspection of engine compartment components and wiring and connections, as well as computer scanning.

Q: How can I repair an Ignition Coil A Primary Secondary Circuit Malfunction?
A: An Ignition Coil A Primary Secondary Circuit Malfunction can be repaired by replacing components such as ignition coils and spark plugs, and performing service and inspection.

Q: How much does it cost to repair an Ignition Coil A Primary Secondary Circuit Malfunction?
A: The cost of repair for an Ignition Coil A Primary Secondary Circuit Malfunction depends on the cost of labor and parts.

In conclusion, the p0351 ignition coil a primary secondary circuit malfunction is a common issue that can cause problems with starting the engine and engine performance. If this issue is not addressed quickly, it can lead to further damage to the vehicle’s electrical system and will require more expensive repairs. To avoid this issue, regular maintenance of the ignition coils should be done, as well as ensuring that all of the components in the ignition system are in good working order.

Author Profile

Carl Frisch
Carl Frisch
With more than 30 years in the bicycle industry, I have a strong background in bicycle retailing, sales, marketing and customer service. I have a passion for cycling and a dedication to excellence. As a manager, I worked diligently to increase my capabilities and responsibilities, managing up to eleven mechanics (at Palo Alto Bicycles) and later as a working partner in my own store.

As the shop owner of Spoke n’ Word Cycles in Socorro, NM, the success of the mission was my responsibility, which I pursued passionately since we opened in 2003 through the spring of 2011. I am adept at managing owned and loan inventory, preparing weekly & annual inventory statements, and managing staff. The role as managing partner also allowed me tremendous freedom. I used this personal freedom to become more deeply involved in my own advancement as a mechanic, to spearhead local trail building, and advocating for cycling both locally and regionally.

As a mechanic, I have several years doing neutral support, experience as a team mechanic, and experience supporting local rides, races, club events. I consistently strive to ensure that bicycles function flawlessly by foreseeing issues and working with the riders, soigners, coaches and other mechanics. Even with decades of experience as a shop mechanic and team mechanic, and continue to pursue greater involvement in this sport as a US Pro Mechanic, and UCI Pro Mechanic.

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