P0351 Code: Ignition Coil "A" Primary/Secondary Circuit Malfunction

Written by RepairDost Editorial Team
Updated on February 10, 2024

3 Min Read

P0351 code definition

Ignition Coil “A” Primary/Secondary Circuit Malfunction

What does the P0351 code mean?

P0351 is an OBD-II code, meaning it’s a generic code that applies to various vehicles. The P0351 code means the ignition coil “A” primary/secondary circuit malfunction.

What causes the P0351 code?

Ignition coil “A” open or shorted circuit
Ignition coil “A” grounded circuit (to ground)
Ignition coil “A” control circuit malfunction

What are the most common symptoms of the P0351 code?

Hard to start the car
Check engine light is on
The engine runs rough and stalls/dies out frequently when you’re driving
The car may also feel misfiring, which can be detected by listening to a rattling sound under the hood.

How does a mechanic diagnose the P0351 code?

A mechanic will check for blown fuses and loose or corroded connectors. They’ll also review the wiring for damage and any sensors or relays that could be causing the problem. If everything checks out, they will check your engine control module (ECM), which controls various systems, including ignition coils. If this is too much work for you, consider taking it into a shop and letting them diagnose it for you.

How do I know if my ignition coil is bad?

Common signs of a bad ignition coil include engine misfires, rough idling, a decrease in fuel efficiency, and difficulty starting the engine. Additionally, a diagnostic scan may reveal a P0351 code.

Can I clear the P0351 code without fixing the issue?

Clearing the trouble code without addressing the underlying problem will only temporarily turn off the Check Engine Light. The issue will likely persist, and the code may return. It’s crucial to diagnose and fix the problem to prevent further issues.

How much does it cost to fix it?

The cost to fix the P0351 code can vary depending on the cause of the issue, the vehicle make and model, and labor rates in your area. Costs may include parts such as ignition coils or spark plugs and labor for diagnosis and repair.

Can I replace the ignition coil myself?

Replacing an ignition coil can be a DIY task for those with automotive repair experience. However, it’s essential to follow the vehicle’s service manual and use the correct tools. If you’re not comfortable with the repair, it’s advisable to seek professional assistance

Can I still drive with the P0351 code?

The P0351 code is the most serious of the ignition coil codes. This means that if you continue to drive your vehicle with this code stored in memory, you could cause further damage to your engine.

Can a faulty spark plug cause the P0351 code?

Yes, a faulty spark plug can contribute to the P0351 code. It’s advisable to inspect and replace spark plugs when addressing the P0351 code, as worn or damaged spark plugs can affect the performance of the associated ignition coil.

Which is ignition coil C?

Ignition coil C in a standard 4-cylinder engine corresponds to the coil serving the third cylinder in the firing order. However, it’s crucial to consult the vehicle’s service manual or manufacturer’s specifications for precise information, as the labeling and arrangement of ignition coils can vary between different makes and models. The service manual provides details about the engine layout, cylinder numbering, and specific ignition coil designations. If this information is not readily available, contacting the vehicle manufacturer’s customer support or seeking assistance from a qualified mechanic is recommended for accurate guidance based on your particular vehicle.

How long does it take to fix the P0351 code?

he repair time for the P0351 code varies depending on the cause and the accessibility of the ignition coil. Replacing an ignition coil is a relatively straightforward task and can often be done in a few hours, but additional diagnostic time may be needed.

Can a loose or damaged wire cause the P0351 code?

Yes, loose or damaged wiring in the ignition coil circuit can trigger the P0351 code. It’s essential to inspect the wiring and connectors for any issues and repair or replace them as necessary.

Will the Check Engine Light turn off automatically after fixing the P0351 code?

n many cases, the Check Engine Light will turn off after the repair is completed. However, some vehicles may require the use of an OBD-II scanner to clear the stored trouble codes and reset the light.

Can extreme weather conditions affect the occurrence of the P0351 code?

Yes, extreme weather conditions, such as extremely hot or cold temperatures, can influence the electrical components in the ignition system and contribute to the occurrence of the P0351 code.

Can aftermarket ignition coils be used to replace a faulty one?

Yes, aftermarket ignition coils can be used as replacements, but it’s crucial to ensure they meet the specifications of the vehicle’s manufacturer. High-quality aftermarket parts from reputable brands are generally suitable alternatives.

The video below shows how to fix P0351 engine code.