AutoCodes – Mercedes-Benz – P0350 Mercedes-Benz

P0350 Mercedes-Benz Code - Ignition Coil Primary/Secondary Circuit Malfunction

Quick Answer

The ignition signal from the Engine Control Module (ECM) is sent to and amplified by the power transistor. Common causes include Faulty Ignition Coil Primary/Secondary, Ignition Coil Primary/Secondary harness is open or shorted, Ignition Coil Primary/Secondary circuit poor electrical connection. 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: P0350 Mercedes-Benz indicates Ignition Coil Primary/Secondary Circuit Malfunction.
Common causes: Common causes include Faulty Ignition Coil Primary/Secondary, Ignition Coil Primary/Secondary harness is open or shorted, Ignition Coil Primary/Secondary circuit poor electrical connection.
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.

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Code Popularity 5,939

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0350 Mercedes-Benz Description

The ignition signal from the Engine Control Module (ECM) is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil secondary circuit.

OBDII Code P0350 Mercedes-Benz - Ignition Coil Primary/Secondary Circuit Malfunction - AutoCodes.com — P0350 Mercedes-Benz Code - Ignition Coil Primary/Secondary Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0350 Mercedes-Benz?

Faulty Ignition Coil Primary/Secondary
Ignition Coil Primary/Secondary harness is open or shorted
Ignition Coil Primary/Secondary circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0350 Mercedes-Benz?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0350 Mercedes-Benz code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0350 Mercedes-Benz code?

Need more information on how to fix the P0350 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0350 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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 P0350 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0350 in a Mercedes-Benz?

- Common symptoms include engine misfires, rough idling, hesitation during acceleration, and a noticeable decrease in fuel efficiency.

2. What causes the ignition coil primary/secondary circuit malfunction in a Mercedes-Benz?

- The main causes of this issue are faulty ignition coils, damaged wiring or connectors in the ignition coil circuit, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the OBDII code P0350 in my Mercedes-Benz?

- Diagnosing this code involves using a scan tool to check for the specific code, testing the ignition coils and their connections, and inspecting the wiring for any signs of damage.

4. Can I still drive my Mercedes-Benz with the P0350 code present?

- It is not recommended to drive your vehicle with the P0350 code present, as it can lead to more serious engine issues and potential damage if left unresolved.

5. How do I repair the ignition coil primary/secondary circuit malfunction in my Mercedes-Benz?

- Repairing this issue typically involves replacing the faulty ignition coils, repairing any damaged wiring or connectors, and resetting the ECM to clear the code.

6. Are there any preventative maintenance tips to avoid the P0350 code in my Mercedes-Benz?

- Regularly inspecting and replacing ignition coils at recommended intervals, ensuring proper maintenance of the ignition system, and using high-quality fuel can help prevent this code from occurring.

7. Can a DIY enthusiast fix the P0350 code in a Mercedes-Benz?

- While some DIY enthusiasts may be able to address simple issues like replacing ignition coils, diagnosing and repairing complex electrical problems related to this code may require professional assistance.

8. Will resetting the OBDII code P0350 make it go away permanently?

- Simply resetting the code without addressing the underlying issue will not make it go away permanently. It is essential to diagnose and repair the root cause to prevent the code from reoccurring.

9. How much does it typically cost to repair the ignition coil primary/secondary circuit malfunction in a Mercedes-Benz?

- The cost of repairing this issue can vary depending on the extent of the damage, the labor rates of the repair shop, and whether any parts need to be replaced. It is advisable to get a quote from a certified mechanic.

10. Is the OBDII code P0350 specific to Mercedes-Benz vehicles only?

- No, the OBDII code P0350 related to ignition coil primary/secondary circuit malfunction can occur in various makes and models of vehicles, not just limited to Mercedes-Benz.