P0358 Mercedes-Benz Code - Ignition Coil 8 Primary/Secondary Circuit Malfunction
Quick Answer
The ignition system on the vehicle uses individual ignition coils for each cylinder. Common causes include Faulty Ignition Coil 8, Ignition Coil 8 harness is open or shorted, Ignition Coil 8 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
- P0358 Mercedes-Benz indicates Ignition Coil 8 Primary/Secondary Circuit Malfunction.
- Common causes
- Common causes include Faulty Ignition Coil 8, Ignition Coil 8 harness is open or shorted, Ignition Coil 8 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.
Code P0358 Mercedes-Benz Description
What are the Possible Causes of the DTC P0358 Mercedes-Benz?
- Faulty Ignition Coil 8
- Ignition Coil 8 harness is open or shorted
- Ignition Coil 8 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0358 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 P0358 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 P0358 Mercedes-Benz code?
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Frequently Asked Questions about P0358 Mercedes-Benz Code
1. What does the OBDII code P0358 mean on a Mercedes-Benz?
P0358 indicates a malfunction in the primary or secondary circuit of the ignition coil for cylinder 8.
2. What are the symptoms of code P0358 in a Mercedes-Benz?
Common symptoms include engine misfires, rough idling, reduced power, difficulty starting, and an illuminated check engine light.
3. What causes the P0358 code to appear on a Mercedes-Benz?
The most common causes are a faulty ignition coil, damaged wiring or connectors, a defective spark plug, or a malfunctioning engine control module (ECM).
4. Can I drive my Mercedes-Benz with a P0358 code?
Driving with a P0358 code is not recommended as it can lead to engine misfires, reduced fuel efficiency, and potential damage to the catalytic converter.
5. How is the P0358 code diagnosed on a Mercedes-Benz?
A mechanic will use a scan tool to confirm the code, inspect the ignition coil and wiring for damage, test the coil’s resistance, and check for proper ECM output.
6. How do I fix the P0358 code on my Mercedes-Benz?
Repairs may include replacing the ignition coil for cylinder 8, fixing damaged wiring or connectors, replacing the spark plug, or reprogramming the ECM if necessary.
7. How much does it cost to repair a P0358 code on a Mercedes-Benz?
The repair cost varies but typically ranges from $100 to $300, depending on whether the ignition coil, spark plug, or wiring needs to be replaced.
8. Can a bad spark plug cause the P0358 code on a Mercedes-Benz?
Yes, a worn or damaged spark plug in cylinder 8 can cause the ignition coil to malfunction, triggering the P0358 code.
9. What tools are needed to troubleshoot the P0358 code on a Mercedes-Benz?
A diagnostic scan tool, a multimeter, and basic hand tools are typically required to diagnose and repair this code.
10. Will clearing the P0358 code fix the problem on my Mercedes-Benz?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be fixed to prevent the code from returning.
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