Mercedes C300 Eco Start Stop Not Working: Troubleshooting Guide

The Mercedes C300 eco start stop system is a convenient feature that enhances fuel efficiency. Is your Mercedes C300 Eco Start Stop Not Working? CARDIAGTECH.NET has the solutions. We dive into common causes and provide a step-by-step guide to help you troubleshoot the issue and get your system back on track, ensuring a smooth and eco-friendly driving experience. Learn about auxiliary battery problems, sensor malfunctions, and diagnostic tools and discover how to maintain your system.

1. Understanding the Mercedes C300 Eco Start Stop System

The Mercedes-Benz C300 eco start-stop system is designed to improve fuel economy and reduce emissions. The system automatically shuts off the engine when the vehicle comes to a complete stop, such as at a traffic light or in heavy traffic. It then restarts the engine when the driver releases the brake pedal or presses the accelerator. This seamless operation can significantly reduce fuel consumption, particularly in urban driving conditions where idling time is substantial.

1.1 How the System Works

The eco start-stop system relies on a complex interplay of sensors, control units, and actuators. When the vehicle stops and certain conditions are met (e.g., engine at operating temperature, battery sufficiently charged, climate control demands within limits), the engine control unit (ECU) shuts off the engine. A specialized starter motor and robust battery are used to ensure a quick and reliable restart when needed.

1.2 Benefits of the Eco Start Stop System

The primary benefit of the eco start-stop system is fuel efficiency. By reducing idling time, the system lowers fuel consumption, which translates to cost savings for the vehicle owner. Additionally, it contributes to lower emissions, helping to reduce the vehicle’s environmental impact. For instance, studies have shown that start-stop systems can improve fuel economy by 5-10% in urban driving scenarios.

1.3 Key Components Involved

Engine Control Unit (ECU): The brain of the system, monitoring various parameters and deciding when to stop and start the engine.
Starter Motor: A heavy-duty starter motor designed for frequent use.
Battery: An enhanced absorbent glass mat (AGM) battery or auxiliary battery to handle the increased demands of frequent starts.
Sensors: Various sensors monitor engine temperature, battery charge, brake pedal position, and other critical parameters.

2. Common Reasons Why the Eco Start Stop System May Not Work

Several factors can prevent the eco start-stop system from functioning correctly. These range from simple issues like a low battery to more complex problems involving sensors or the ECU. Understanding these common causes is the first step in troubleshooting the problem.

2.1 Low Battery Voltage

One of the most frequent causes of a non-functional eco start-stop system is low battery voltage. The system requires a sufficient charge in the main or auxiliary battery to operate effectively. If the battery voltage drops below a certain threshold, the system will disable itself to prevent potential starting problems.

Main Battery: The primary battery provides the initial power to start the engine. If it’s old or not properly charged, the start-stop system may not engage.
Auxiliary Battery: Some Mercedes-Benz models have an auxiliary battery specifically for the start-stop system. If this battery is weak, the system won’t work.

2.2 Faulty Sensors

The eco start-stop system relies on various sensors to monitor critical parameters. A faulty sensor can provide incorrect data to the ECU, preventing the system from functioning.

Crankshaft Position Sensor: Monitors the engine’s rotational speed and position.
Brake Pedal Sensor: Detects when the brake pedal is pressed.
Battery Sensor: Monitors the battery’s voltage and temperature.

2.3 Engine Temperature

The engine must be at its optimal operating temperature for the eco start-stop system to activate. If the engine is too cold or too hot, the system will remain inactive to protect the engine.

2.4 Climate Control Settings

The climate control system can also affect the operation of the eco start-stop system. If the air conditioning or heating is set to high, the system may remain inactive to maintain passenger comfort.

2.5 System Overrides

In some cases, the eco start-stop system may be temporarily overridden due to various factors. These overrides are designed to protect the vehicle’s components or ensure driver safety.

Steep Inclines: The system may not activate if the vehicle is on a steep incline.
Trailer Towing: When towing a trailer, the system is typically disabled.

2.6 Software Issues

Software glitches or outdated software in the ECU can also cause the eco start-stop system to malfunction. Regularly updating the vehicle’s software can help resolve these issues.

2.7 Faulty Starter Motor

Although rare, a failing starter motor can be the reason for start/stop malfunctions. The eco start-stop system uses the starter motor more frequently than a conventional vehicle. This increased usage can cause premature wear and tear on the starter motor.

3. Step-by-Step Troubleshooting Guide

When your Mercedes C300 eco start-stop system isn’t working, follow these troubleshooting steps to identify and resolve the issue.

3.1 Initial Checks

Before diving into more complex diagnostics, perform these initial checks:

Check the Battery Voltage:
- Use a multimeter to measure the battery voltage. A fully charged battery should read around 12.6 volts.
- If the voltage is below 12 volts, charge the battery using a battery charger.
Inspect the Battery Terminals:
- Ensure the battery terminals are clean and free of corrosion.
- Tighten any loose connections.
Verify the Eco Start Stop Button:
- Make sure the eco start-stop button is not manually turned off. The system may have a button to disable it.
Check the Dashboard for Error Messages:
- Look for any error messages or warning lights related to the start-stop system or battery.

3.2 Using a Diagnostic Scanner

A diagnostic scanner can provide valuable information about the system’s status and any stored error codes.

Connect the Scanner:
- Plug the diagnostic scanner into the OBD-II port, usually located under the dashboard.
Read Error Codes:
- Turn on the ignition and use the scanner to read any stored error codes.
- Note down the codes for further analysis.
Clear Error Codes (If Applicable):
- If the codes seem minor and you’ve addressed the potential issue, clear the error codes and see if the system starts working again.

3.3 Checking the Auxiliary Battery

Many Mercedes-Benz models use an auxiliary battery to support the eco start-stop system. Check its condition and voltage.

Locate the Auxiliary Battery:
- The auxiliary battery is usually located in the trunk or under the rear seat. Consult your owner’s manual for the exact location.
Measure the Voltage:
- Use a multimeter to measure the voltage of the auxiliary battery. It should be around 12.6 volts when fully charged.
Test the Battery’s Health:
- Use a battery tester to assess the battery’s overall health and ability to hold a charge.

3.4 Inspecting Sensors

Faulty sensors can prevent the eco start-stop system from working correctly. Inspect the relevant sensors for damage or loose connections.

Crankshaft Position Sensor:
- Locate the crankshaft position sensor near the crankshaft pulley.
- Check for any visible damage or loose connections.
Brake Pedal Sensor:
- Locate the brake pedal sensor near the brake pedal assembly.
- Ensure the sensor is properly connected and functioning.
Battery Sensor:
- Locate the battery sensor on the battery terminal.
- Check for corrosion or damage.

3.5 Checking Engine Temperature

The engine needs to be at its normal operating temperature for the eco start-stop system to function.

Monitor Engine Temperature:
- Start the engine and let it run for a few minutes.
- Check the engine temperature gauge on the dashboard. It should reach the normal operating range.
Check Coolant Levels:
- Ensure the coolant levels are adequate to maintain the correct engine temperature.

3.6 Reviewing Climate Control Settings

High climate control settings can prevent the system from activating.

Adjust Climate Control:
- Turn off the air conditioning or lower the fan speed to see if the eco start-stop system starts working.
Monitor System Behavior:
- Observe if the system engages when the climate control settings are reduced.

3.7 Seeking Professional Help

If you’ve performed these troubleshooting steps and the eco start-stop system is still not working, it may be time to seek professional help. A certified mechanic can diagnose and repair more complex issues. Contact CARDIAGTECH.NET at 276 Reock St, City of Orange, NJ 07050, United States or Whatsapp: +1 (641) 206-8880. You can also visit our website at CARDIAGTECH.NET for immediate assistance.

4. Advanced Diagnostic Techniques

For more complex issues, advanced diagnostic techniques may be required. These techniques often involve specialized equipment and expertise.

4.1 Using Mercedes-Benz STAR Diagnostic System

The Mercedes-Benz STAR Diagnostic System is a comprehensive tool used by dealerships and specialized mechanics to diagnose and repair Mercedes-Benz vehicles.

Connect to the Vehicle:
- Connect the STAR Diagnostic System to the vehicle’s OBD-II port.
Run Diagnostic Tests:
- Use the system to run diagnostic tests on the eco start-stop system and related components.
Analyze Data:
- Carefully analyze the data provided by the system to identify any faults or anomalies.
Perform Calibrations:
- Use the system to perform any necessary calibrations or adjustments.

4.2 Checking for Software Updates

Outdated software can cause various issues with the eco start-stop system. Ensure the vehicle’s software is up to date.

Check for Updates:
- Visit a Mercedes-Benz dealership or authorized service center to check for software updates.
Install Updates:
- Have the latest software updates installed to ensure optimal performance.

4.3 Testing Individual Components

Individual components, such as sensors and the starter motor, can be tested to determine if they are functioning correctly.

Sensor Testing:
- Use a multimeter or oscilloscope to test the output signals from the crankshaft position sensor, brake pedal sensor, and battery sensor.
- Compare the readings to the manufacturer’s specifications.
Starter Motor Testing:
- Use a specialized starter motor tester to assess the motor’s performance and identify any faults.

5. Maintaining Your Mercedes C300 Eco Start Stop System

Proper maintenance is crucial for ensuring the longevity and reliability of your Mercedes C300 eco start-stop system.

5.1 Regular Battery Maintenance

Maintaining the battery is essential for the eco start-stop system to function correctly.

Keep the Battery Charged:
- Regularly check the battery voltage and charge it as needed.
- Use a trickle charger if the vehicle is not driven frequently.
Clean Battery Terminals:
- Keep the battery terminals clean and free of corrosion.
- Use a wire brush and battery terminal cleaner to remove any buildup.
Check Battery Health:
- Have the battery’s health checked periodically by a professional.

5.2 Sensor Care

Keeping the sensors clean and in good condition is important for accurate readings.

Clean Sensors Regularly:
- Clean the sensors with a soft cloth to remove any dirt or debris.
Inspect for Damage:
- Regularly inspect the sensors for any signs of damage or wear.
Replace Faulty Sensors:
- Replace any faulty sensors as soon as possible.

5.3 Software Updates

Staying up-to-date with the latest software updates can help prevent issues with the eco start-stop system.

Check for Updates Regularly:
- Visit a Mercedes-Benz dealership or authorized service center to check for software updates.
Install Updates Promptly:
- Install any available updates to ensure optimal performance.

5.4 Professional Inspections

Regular professional inspections can help identify potential issues before they become major problems.

Schedule Regular Checkups:
- Schedule regular checkups with a certified mechanic to inspect the eco start-stop system.
Address Issues Promptly:
- Address any identified issues promptly to prevent further damage.

6. The Role of CARDIAGTECH.NET in Maintaining Your System

CARDIAGTECH.NET offers a range of diagnostic tools and equipment to help you maintain your Mercedes C300 eco start-stop system. From battery testers to diagnostic scanners, we have everything you need to keep your system running smoothly.

6.1 Diagnostic Tools Available

CARDIAGTECH.NET provides a variety of diagnostic tools suitable for both professional mechanics and DIY enthusiasts.

OBD-II Scanners: Read and clear error codes, monitor system parameters, and diagnose issues with the eco start-stop system.
Battery Testers: Assess the health and charge of the battery.
Multimeters: Measure voltage, current, and resistance to diagnose electrical issues.
Specialized Sensor Testers: Test the functionality of individual sensors.

6.2 Benefits of Using Quality Diagnostic Tools

Investing in high-quality diagnostic tools can save you time and money in the long run.

Accurate Diagnostics: Identify issues quickly and accurately.
Reduced Downtime: Minimize the time your vehicle is out of service.
Cost Savings: Avoid unnecessary repairs by accurately diagnosing the problem.
Preventative Maintenance: Identify potential issues before they become major problems.

6.3 How CARDIAGTECH.NET Supports Automotive Technicians

CARDIAGTECH.NET is committed to supporting automotive technicians with the tools and resources they need to succeed.

Wide Range of Products: We offer a wide range of diagnostic tools and equipment from leading manufacturers.
Expert Advice: Our team of experts can provide advice and support to help you choose the right tools for your needs.
Competitive Pricing: We offer competitive pricing on all our products.
Exceptional Customer Service: We are committed to providing exceptional customer service and support.

Don’t let a malfunctioning eco start-stop system slow you down. Contact CARDIAGTECH.NET at 276 Reock St, City of Orange, NJ 07050, United States or Whatsapp: +1 (641) 206-8880. You can also visit our website at CARDIAGTECH.NET for immediate assistance and expert advice.

7. Understanding Battery Issues in Detail

Battery problems are a primary culprit behind eco start-stop system failures. Understanding the nuances of battery health, types, and maintenance can greatly assist in resolving these issues.

7.1 Types of Batteries Used in Eco Start Stop Systems

Mercedes-Benz eco start-stop systems typically use enhanced flooded batteries (EFB) or absorbent glass mat (AGM) batteries.

EFB Batteries: These batteries are an enhanced version of standard flooded batteries, designed to withstand the increased demands of start-stop systems.
AGM Batteries: AGM batteries are more robust and offer superior performance in start-stop applications. They are more resistant to vibration and have a longer lifespan.

7.2 How Battery Age Affects the System

As batteries age, their ability to hold a charge diminishes. This can lead to the eco start-stop system becoming less effective or failing altogether.

Reduced Capacity: Older batteries have a reduced capacity, making it difficult for them to provide the necessary power for frequent starts.
Increased Internal Resistance: As batteries age, their internal resistance increases, reducing their ability to deliver current quickly.

7.3 Testing Battery Health

Regularly testing battery health can help identify potential issues before they cause system failures.

Voltage Test:
- Use a multimeter to measure the battery voltage. A fully charged battery should read around 12.6 volts.
Load Test:
- Use a load tester to assess the battery’s ability to deliver current under load.
State of Charge (SOC) Test:
- Use a diagnostic scanner to check the battery’s state of charge.
State of Health (SOH) Test:
- Use a diagnostic scanner to check the battery’s state of health, which provides an overall assessment of the battery’s condition.

7.4 When to Replace the Battery

Knowing when to replace the battery can prevent unexpected system failures.

Age: Batteries typically last 3-5 years. If your battery is older than this, consider replacing it.
Frequent Jump Starts: If you frequently need to jump-start your vehicle, the battery may be failing.
Slow Cranking: If the engine cranks slowly when starting, it could be a sign of a weak battery.
Warning Lights: If the battery warning light is illuminated on the dashboard, have the battery checked immediately.

8. Exploring Sensor-Related Problems

Sensors play a crucial role in the eco start-stop system. When these sensors malfunction, the system can fail.

8.1 Role of Each Sensor in the System

Each sensor provides critical data to the ECU, which determines when to stop and start the engine.

Crankshaft Position Sensor: Monitors the engine’s rotational speed and position.
Brake Pedal Sensor: Detects when the brake pedal is pressed.
Battery Sensor: Monitors the battery’s voltage and temperature.
Vehicle Speed Sensor: Monitors the vehicle’s speed.
Engine Temperature Sensor: Monitors the engine’s temperature.

8.2 Identifying Faulty Sensors

Identifying faulty sensors requires careful inspection and testing.

Visual Inspection:
- Check the sensors for any visible damage or loose connections.
Diagnostic Scanner:
- Use a diagnostic scanner to read error codes related to the sensors.
Multimeter Testing:
- Use a multimeter to test the sensor’s output signals and compare them to the manufacturer’s specifications.

8.3 Replacing Sensors

Replacing faulty sensors can restore the eco start-stop system to proper working order.

Purchase Replacement Sensor:
- Purchase a replacement sensor from a reputable supplier.
Disconnect Old Sensor:
- Disconnect the old sensor from its wiring harness.
Install New Sensor:
- Install the new sensor and connect it to the wiring harness.
Test the System:
- Test the eco start-stop system to ensure the new sensor is functioning correctly.

8.4 Common Sensor Error Codes

Understanding common sensor error codes can help you diagnose issues more quickly.

P0335: Crankshaft Position Sensor A Circuit Malfunction
P0703: Brake Switch A Circuit Malfunction
P0562: System Voltage Low

9. Addressing Software and ECU Issues

Software glitches and outdated ECU software can also cause problems with the eco start-stop system.

9.1 Signs of Software Problems

Identifying software problems can be challenging, but certain signs can indicate an issue.

Intermittent System Failures: The system works sometimes but not others.
False Error Codes: The system displays error codes that don’t seem related to any specific component.
System Inactivity: The system never engages, even when all conditions are met.

9.2 Updating ECU Software

Updating the ECU software can resolve many software-related issues.

Visit Dealership:
- Visit a Mercedes-Benz dealership or authorized service center to have the ECU software updated.
Follow Instructions:
- Follow the technician’s instructions carefully during the update process.
Test the System:
- Test the eco start-stop system after the update to ensure it is functioning correctly.

9.3 Resetting the ECU

Resetting the ECU can sometimes resolve minor software glitches.

Disconnect Battery:
- Disconnect the negative terminal of the battery for 15-20 minutes.
Reconnect Battery:
- Reconnect the battery terminal.
Test the System:
- Test the eco start-stop system to see if the reset has resolved the issue.

9.4 When to Seek Professional Assistance

If software updates and ECU resets do not resolve the issue, it may be necessary to seek professional assistance. A certified technician can perform more advanced diagnostics and repairs.
Contact CARDIAGTECH.NET at 276 Reock St, City of Orange, NJ 07050, United States or Whatsapp: +1 (641) 206-8880. You can also visit our website at CARDIAGTECH.NET for immediate assistance.

10. DIY vs. Professional Repair: Making the Right Choice

Deciding whether to tackle the repair yourself or seek professional help depends on your skill level and the complexity of the issue.

10.1 When to Consider DIY Repair

DIY repair may be appropriate for simple issues that do not require specialized tools or expertise.

Battery Replacement: Replacing a battery is a relatively straightforward task that can be done at home.
Cleaning Battery Terminals: Cleaning corroded battery terminals is a simple maintenance task.
Checking Fuses: Checking and replacing blown fuses is a quick and easy repair.

10.2 When to Seek Professional Help

Professional help is recommended for more complex issues that require specialized tools, knowledge, and experience.

Sensor Replacement: Replacing sensors can be challenging and may require specialized tools.
Software Updates: Updating ECU software requires specialized equipment and expertise.
Advanced Diagnostics: Diagnosing complex issues requires a diagnostic scanner and a thorough understanding of the system.

10.3 Cost Comparison

Consider the cost of parts, tools, and labor when deciding whether to DIY or seek professional help.

DIY Costs: Parts, tools, and your time.
Professional Costs: Labor, parts, and diagnostic fees.

10.4 Ensuring Safety

Safety should always be a top priority when working on your vehicle.

Disconnect Battery: Always disconnect the battery before working on electrical components.
Use Proper Tools: Use the correct tools for the job.
Follow Instructions: Follow the manufacturer’s instructions carefully.
Wear Safety Gear: Wear safety glasses and gloves to protect yourself.

11. Real-World Examples and Case Studies

Examining real-world examples can provide valuable insights into diagnosing and resolving eco start-stop system issues.

11.1 Case Study 1: Low Auxiliary Battery Voltage

Problem: The eco start-stop system was not functioning.
Diagnosis: The auxiliary battery voltage was low.
Solution: The auxiliary battery was replaced, and the system was restored to proper working order.

11.2 Case Study 2: Faulty Crankshaft Position Sensor

Problem: The eco start-stop system was intermittently failing.
Diagnosis: The crankshaft position sensor was faulty.
Solution: The crankshaft position sensor was replaced, and the system was restored to proper working order.

11.3 Case Study 3: Outdated ECU Software

Problem: The eco start-stop system was not functioning and displaying false error codes.
Diagnosis: The ECU software was outdated.
Solution: The ECU software was updated, and the system was restored to proper working order.

11.4 Key Takeaways

These case studies highlight the importance of thorough diagnostics and the use of appropriate tools and techniques.
CARDIAGTECH.NET at 276 Reock St, City of Orange, NJ 07050, United States, and Whatsapp: +1 (641) 206-8880 can assist with this. You can also visit our website at CARDIAGTECH.NET for immediate assistance.

12. Optimizing Fuel Efficiency Beyond the Eco Start Stop System

While the eco start-stop system is designed to enhance fuel efficiency, several other factors can also play a significant role.

12.1 Driving Habits

Aggressive driving habits can significantly reduce fuel efficiency.

Avoid Hard Acceleration: Accelerate smoothly and gradually.
Maintain Consistent Speed: Maintain a consistent speed on the highway.
Anticipate Traffic: Anticipate traffic conditions and avoid sudden braking.

12.2 Tire Maintenance

Proper tire maintenance can improve fuel efficiency.

Maintain Proper Tire Pressure: Check tire pressure regularly and inflate tires to the recommended pressure.
Use Low Rolling Resistance Tires: Consider using low rolling resistance tires.

12.3 Regular Vehicle Maintenance

Regular vehicle maintenance can ensure optimal fuel efficiency.

Change Engine Oil Regularly: Change the engine oil according to the manufacturer’s recommendations.
Replace Air Filter: Replace the air filter regularly to ensure proper airflow to the engine.
Keep the Engine Tuned: Keep the engine tuned and address any performance issues promptly.

12.4 Reducing Weight

Reducing weight can improve fuel efficiency.

Remove Unnecessary Items: Remove any unnecessary items from the vehicle.
Avoid Carrying Heavy Loads: Avoid carrying heavy loads whenever possible.

13. Future Trends in Eco Start Stop Technology

The eco start-stop technology is continuously evolving.

13.1 Advancements in Battery Technology

Advancements in battery technology are leading to more efficient and reliable start-stop systems.

Lithium-Ion Batteries: Lithium-ion batteries offer higher energy density and longer lifespans.
Improved AGM Batteries: Improved AGM batteries offer better performance and durability.

13.2 Integration with Hybrid and Electric Vehicles

Eco start-stop technology is increasingly being integrated with hybrid and electric vehicles.

Seamless Integration: Seamless integration with hybrid and electric powertrains.
Enhanced Efficiency: Enhanced fuel efficiency and reduced emissions.

13.3 Predictive Start Stop Systems

Predictive start-stop systems use GPS data and other information to predict when the vehicle will come to a stop.

Improved Efficiency: Improved fuel efficiency and reduced emissions.
Smoother Operation: Smoother and more seamless operation.

13.4 The Role of Artificial Intelligence

Artificial intelligence is playing an increasingly important role in optimizing the performance of eco start-stop systems.

Real-Time Optimization: Real-time optimization of system parameters.
Improved Efficiency: Improved fuel efficiency and reduced emissions.

14. Frequently Asked Questions (FAQ)

1. Why is my Mercedes C300 eco start-stop not working?

The most common reasons include a low battery, faulty sensors, incorrect engine temperature, or climate control settings.

2. How do I check the battery voltage?

Use a multimeter to measure the voltage at the battery terminals. A fully charged battery should read around 12.6 volts.

3. What is an auxiliary battery, and where is it located?

An auxiliary battery supports the eco start-stop system. It’s usually located in the trunk or under the rear seat. Consult your owner’s manual for the exact location.

4. Can I disable the eco start-stop system?

Yes, most Mercedes-Benz models have a button to manually disable the system.

5. How often should I replace the battery?

Batteries typically last 3-5 years. Replace the battery if it’s older than this or shows signs of weakening.

6. What are common sensor error codes related to the eco start-stop system?

Common codes include P0335 (Crankshaft Position Sensor), P0703 (Brake Switch), and P0562 (System Voltage Low).

7. How do I update the ECU software?

Visit a Mercedes-Benz dealership or authorized service center to have the ECU software updated.

8. Is it safe to perform DIY repairs on the eco start-stop system?

DIY repair is appropriate for simple issues. Seek professional help for more complex problems.

9. How can CARDIAGTECH.NET help me maintain my system?

CARDIAGTECH.NET offers a range of diagnostic tools and equipment to help you maintain your eco start-stop system.

10. What are some tips for improving fuel efficiency beyond the eco start-stop system?

Avoid aggressive driving, maintain proper tire pressure, and perform regular vehicle maintenance.

15. Final Thoughts and Recommendations

The Mercedes C300 eco start-stop system is designed to improve fuel efficiency and reduce emissions. However, several factors can prevent the system from functioning correctly. By following the troubleshooting steps outlined in this guide, you can identify and resolve many common issues. Remember to prioritize safety and seek professional help when needed.

15.1 Key Takeaways

Regular battery maintenance is essential for the eco start-stop system to function correctly.
Faulty sensors can prevent the system from working.
Software updates can resolve many software-related issues.
DIY repair is appropriate for simple issues, but professional help is recommended for more complex problems.

15.2 Recommendations

Keep your battery properly charged and maintained.
Check and replace faulty sensors promptly.
Stay up-to-date with the latest software updates.
Use quality diagnostic tools to identify and resolve issues.

15.3 Contact Information

For expert advice and support, contact CARDIAGTECH.NET at 276 Reock St, City of Orange, NJ 07050, United States or Whatsapp: +1 (641) 206-8880. You can also visit our website at CARDIAGTECH.NET for immediate assistance. Let us help you keep your Mercedes C300 eco start-stop system running smoothly and efficiently.