P0355 Technical Description
Ignition Coil “E” Primary/Secondary Circuit Malfunction
If you’re seeing the P0355 trouble code, you’re likely wondering what it means and how to fix it. This guide will break down the meaning, symptoms, causes, and fixes for this code.
I’ve fixed this issue many times, so you’re in good hands.
You’ll learn how to identify the symptoms of P0355, understand its causes, and discover practical solutions to get your car running smoothly again.
Alright, let’s get started.
Key Takeaways
- P0355 indicates a malfunction in the ignition coil “E” primary/secondary circuit.
- Common symptoms include engine misfires, rough idling, and reduced performance.
- Diagnose by checking the ignition coil, connections, and wiring.
- Test the ignition coil with a multimeter to ensure proper resistance.
- Swap coils to confirm if the coil is faulty.
- Replacing a faulty ignition coil often resolves the P0355 trouble code.
Table of ContentsShow
What Does P0355 Trouble Code Mean?
The P0355 trouble code means there’s a problem with the ignition coil “E” primary or secondary circuit.
Ignition coils are crucial because they transform the battery’s voltage into the thousands of volts needed to create a spark in the spark plugs.
This spark ignites the fuel-air mixture in the engine cylinders.
When the P0355 code is triggered, it specifically points to a malfunction in the circuit of the fifth ignition coil, labeled “E.”
The engine control module (ECM) monitors all ignition coils for proper function. If the ECM detects an abnormality or interruption in the coil “E” circuit, it sets the P0355 code.
This issue can result in a variety of problems. You might notice rough idling, engine misfires, or even a noticeable drop in engine performance.
The check engine light will likely be illuminated as well. Ignoring this code can lead to more severe engine problems over time, so it’s essential to address it promptly.
In many cases, the problem is due to a faulty ignition coil, damaged wiring, or poor connections in the circuit.
Sometimes, it might be a more complex issue involving the ECM itself. Either way, diagnosing and fixing this code involves inspecting the ignition coil and its connections, and replacing any damaged components.
Understanding the P0355 code helps you pinpoint the source of engine trouble and take the necessary steps to fix it, ensuring your vehicle runs smoothly and efficiently again.
P0355 Trouble Code Symptoms
Here are the common symptoms you might experience when the P0355 trouble code is present:
- Check engine light illuminated
- Engine misfires
- Rough idling
- Reduced engine performance
- Difficulty starting the engine
- Decreased fuel efficiency
P0355 Trouble Code Causes
Here are the common causes for the P0355 trouble code:
- Faulty ignition coil “E”
- Damaged or corroded electrical connections
- Broken or frayed wiring in the ignition coil circuit
- Faulty engine control module (ECM)
- Issues with the powertrain control module (PCM)
How To Fix A P0355 Trouble Code
To fix a P0355 trouble code, follow these steps to diagnose and repair the issue:
1. Scan for Codes
Use an OBD-II scanner to confirm the P0355 code and check for any additional codes that might indicate related issues.
2. Inspect Ignition Coil “E”
Locate the ignition coil labeled “E” (typically the fifth coil). Check for any visible signs of damage or wear.
3. Check Connections
Ensure all electrical connections to the ignition coil are secure and free of corrosion. Look for any loose or damaged wires.
4. Test the Ignition Coil
Use a multimeter to test the ignition coil’s resistance. Compare the readings with the manufacturer’s specifications. If the readings are outside the normal range, the coil may be faulty.
5. Inspect the Wiring
Examine the wiring harness connected to the ignition coil. Look for any frayed wires, breaks, or signs of wear. Repair or replace any damaged wiring as needed.
6. Swap Coils
If you suspect the coil is faulty but want to be sure, swap the ignition coil “E” with another coil (e.g., swap coil 5 with coil 1). Clear the codes and run the engine. If the code changes to the new coil location (e.g., P0351 for coil 1), then the coil is the problem.
7. Replace the Ignition Coil
If the ignition coil “E” is confirmed to be faulty, replace it with a new one. Ensure the replacement part matches your vehicle’s specifications.
8. Check the ECM
If the ignition coil and wiring are in good condition, the problem might be with the engine control module (ECM). This step usually requires professional diagnostic tools and expertise.
9. Clear the Codes
After making repairs, use the OBD-II scanner to clear any trouble codes. Start the engine and check if the check engine light stays off and if the car runs smoothly.
By following these steps, you can effectively diagnose and fix the P0355 trouble code, ensuring your vehicle runs properly again.
Conclusion
Now you know what the P0355 trouble code means and how to fix it yourself.
Have you ever replaced an ignition coil before?
Share your experience or ask questions in the comments below!
