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P0357 Mercedes-Benz Code - Ignition Coil 7 Primary/Secondary Circuit Malfunction

Quick Answer

The P0357 diagnostic trouble code (DTC) for Mercedes-Benz indicates a malfunction in the ignition coil 7 primary/secondary circuit. Common causes include Faulty ignition coil for cylinder 7, Damaged wiring or connections in the ignition coil circuit, Issues with the engine control module (ECM). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0357 Mercedes-Benz indicates Ignition Coil 7 Primary/Secondary Circuit Malfunction.
Common causes
Common causes include Faulty ignition coil for cylinder 7, Damaged wiring or connections in the ignition coil circuit, Issues with the engine control module (ECM).
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P0357 Mercedes-Benz Description

The P0357 diagnostic trouble code (DTC) for Mercedes-Benz indicates a malfunction in the ignition coil 7 primary/secondary circuit. The ignition coil is a crucial component of the ignition system responsible for producing the high voltage needed to ignite the air-fuel mixture in the engine cylinders. When this circuit malfunctions, it can lead to misfires, rough idling, and overall poor engine performance.

OBDII Code P0357 Mercedes-Benz - Ignition Coil 7 Primary/Secondary Circuit Malfunction
P0357 Mercedes-Benz Code - Ignition Coil 7 Primary/Secondary Circuit Malfunction

Common Causes of P0357 Mercedes-Benz

  1. Faulty ignition coil for cylinder 7
  2. Damaged wiring or connections in the ignition coil circuit
  3. Issues with the engine control module (ECM)
  4. Corrosion or contamination in the ignition coil circuit
  5. Extreme temperatures affecting the ignition coil's performance

Symptoms of P0357 Mercedes-Benz

  1. Rough idling or engine misfires
  2. Loss of power or acceleration
  3. Engine stalling or difficulty starting
  4. Check Engine Light illuminated
  5. Reduced fuel efficiency

How to Fix P0357 Mercedes-Benz

  1. Use an OBD-II scanner to confirm the P0357 code and verify the issue with the ignition coil for cylinder 7.
  2. Inspect the ignition coil, wiring, and connections for any visible damage or corrosion.
  3. Test the ignition coil's resistance and check for proper voltage output to confirm if it is faulty.
  4. Replace the faulty ignition coil if necessary, ensuring proper installation and secure connections.
  5. Clear the DTC and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0357 Mercedes-Benz

The typical repair cost for addressing the P0357 code on a Mercedes-Benz can range from $150 to $300 for parts and labor. However, prices may vary based on the specific model of the vehicle, the location of the repair shop, and the availability of parts. Additional costs may be incurred if other components need to be replaced or if further diagnosis is required. It is recommended to consult with a trusted mechanic or repair shop to get an accurate estimate for the repair. Remember to consider factors such as diagnosis time and labor rates when calculating the total cost.

When is the Code Detected?

Each ignition circuit is continuously monitored by the Engine Control Module (ECM). The test fails when the ECM does not receive a valid pulse signal from the ignition coil.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0357 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0357 in a Mercedes-Benz related to Ignition Coil 7 Primary/Secondary Circuit Malfunction?

Symptoms may include engine misfires, rough idle, lack of power, and illuminated check engine light.

2. What are the possible causes of OBDII code P0357 in a Mercedes-Benz?

Potential causes include a faulty ignition coil, damaged wiring or connectors, ECM issues, or a problem with the spark plug related to cylinder 7.

3. How can I diagnose the OBDII code P0357 in my Mercedes-Benz?

You can diagnose this code by using a diagnostic scanner to read the code, inspecting the ignition coil and related components, checking for loose connections, and performing a resistance test on the ignition coil.

4. Can I continue driving my Mercedes-Benz with OBDII code P0357 related to Ignition Coil 7 Primary/Secondary Circuit Malfunction?

It is not recommended to continue driving with this code as it can cause further damage to the engine and emission control system.

5. How can I repair OBDII code P0357 in my Mercedes-Benz?

The repair typically involves replacing the faulty ignition coil for cylinder 7, addressing any wiring or connector issues, and clearing the code with a diagnostic scanner.

6. Can a DIY enthusiast fix OBDII code P0357 in a Mercedes-Benz?

Yes, if you have the necessary tools and knowledge, you can attempt to fix this issue yourself. However, it is recommended to consult a professional if you are unsure.

7. Is it common for Ignition Coil 7 to fail in Mercedes-Benz vehicles?

While ignition coil failures can occur in any vehicle, it is not uncommon for them to fail in Mercedes-Benz vehicles, especially as they age.

8. Are there any preventive maintenance tips to avoid OBDII code P0357 in a Mercedes-Benz?

Regularly inspecting the ignition system, replacing spark plugs at recommended intervals, and using high-quality fuel can help prevent ignition coil issues.

9. How long does it typically take to repair OBDII code P0357 in a Mercedes-Benz?

The repair time can vary depending on the extent of the issue and the availability of parts, but it generally takes a few hours to complete the repair.

10. Will resetting the check engine light make OBDII code P0357 go away in a Mercedes-Benz?

Resetting the check engine light may temporarily make the light go away, but the underlying issue causing the code will still need to be diagnosed and repaired to prevent further problems.

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