2012 Mercedes-Benz CLS63 AMG Won't Start

Resolve Starting Issues for 2012 Mercedes-Benz CLS63 AMG

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
38% chance it's the
Battery
0%
27% chance it's the
Alternator
0%
20% chance it's the
Starter
0%
15% chance it's
Something else
The most common reasons a 2012 Mercedes-Benz CLS63 AMG won't start are a dead battery, an alternator problem, or failed starter.
  • Battery: A weak or failing battery can result in difficulty starting the engine and electrical system malfunctions.
  • Alternator: A failing alternator can result in insufficient electrical power, leading to battery drain and electrical system malfunctions.
  • Starter: A faulty starter motor or a weak battery can prevent the engine from cranking properly, leading to starting issues.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the initial diagnostic steps to take when a 2012 Mercedes-Benz CLS63 AMG won't start?

When your 2012 Mercedes-Benz CLS63 AMG refuses to start, it's essential to adopt a methodical diagnostic approach to identify the root cause. Begin by checking the battery, as a weak or dead battery is often the simplest explanation for starting problems. Ensure that the battery is fully charged and in good condition. Next, verify the fuel level; a low tank can sometimes lead to unexpected starting issues. If both the battery and fuel levels are adequate, turn your attention to the ignition system. Inspect components like spark plugs and ignition coils for any signs of wear or damage. Utilizing a diagnostic scanner can also be beneficial, as it allows you to read any error codes from the vehicle's computer, providing insights into potential malfunctions. Additionally, assess the starter motor to confirm it is operational, as a faulty starter can prevent the engine from cranking. Finally, examine the fuel system, ensuring that the fuel pump is functioning correctly and delivering fuel to the engine. By following these steps in order, you can effectively narrow down the potential causes of your starting issue and take the necessary actions to resolve it.

What are the common problems that could cause a 2012 Mercedes-Benz CLS63 AMG to not start?

When your 2012 Mercedes-Benz CLS63 AMG refuses to start, it can be frustrating, but understanding the common problems can help you troubleshoot effectively. One of the first things to check is the battery; a weak or dead battery is often the culprit, so ensure it is fully charged and in good condition. If the battery is fine, the next component to consider is the starter motor, as a malfunction here can prevent the engine from turning over. Additionally, inspect the fuel system, including the fuel pump and filter, since clogs or failures can hinder fuel delivery, leading to starting issues. Don't overlook the ignition switch, which can fail and stop the car from starting when the key is turned. Spark plugs are another critical element; worn or faulty plugs can disrupt the ignition process. Lastly, consider the engine control unit (ECU), as any malfunctions or poor connections can significantly impact the starting sequence. By systematically checking these components, you can identify and address the issue, potentially saving on costly repairs.

How urgent is it to address the starting issue in a 2012 Mercedes-Benz CLS63 AMG?

Addressing the starting issue in a 2012 Mercedes-Benz CLS63 AMG is of utmost urgency, as neglecting this problem can lead to serious safety hazards and further mechanical complications. Starting issues may stem from various sources, including a malfunctioning speed sensor or low brake fluid levels, which can compromise the vehicle's overall performance and reliability. If left unchecked, these symptoms could escalate into more severe problems, such as total brake failure, putting both the driver and others on the road at risk. Therefore, it is crucial for DIY enthusiasts to prioritize a thorough inspection and diagnosis of the vehicle as soon as any starting issues arise. Taking immediate action not only ensures the safety of the vehicle but also helps prevent costly repairs down the line, making it essential to address these concerns without delay.

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2012 Mercedes-Benz CLS63 AMG Won't Start? Common Fixes