2020 Mercedes-Benz GLC63 AMG S Won't Start

Resolve Starting Issues with Your 2020 Mercedes-Benz GLC63 AMG S

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Reviewed by
Devin Cabugcal
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 2020 Mercedes-Benz GLC63 AMG S 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 steps to diagnose a starting issue in a 2020 Mercedes-Benz GLC63 AMG S?

To effectively diagnose a starting issue in your 2020 Mercedes-Benz GLC63 AMG S, begin with the simplest and most accessible components. Start by checking the battery, as a fully charged and functional battery is crucial for starting the vehicle. If the battery is in good condition, proceed to inspect the starter motor, ensuring it operates correctly, as a malfunctioning starter can prevent the engine from turning over. Next, examine the ignition switch for any signs of wear or damage, as this can also hinder the starting process. Once these initial checks are complete, verify that the fuel system is delivering the necessary fuel to the engine; this includes ensuring the fuel pump is operational and that there are no leaks or blockages in the fuel lines. Additionally, inspect the spark plugs to confirm they are firing properly, as faulty spark plugs can lead to starting difficulties. Finally, utilize a diagnostic scanner to check for any error codes that may provide insights into underlying issues. By following this structured approach, you can systematically identify and address the root cause of the starting problem in your vehicle.

What are the common problems that could cause a 2020 Mercedes-Benz GLC63 AMG S to not start?

When a 2020 Mercedes-Benz GLC63 AMG S fails to start, several common problems may be at play. One of the first areas to investigate is the battery, as a dead or weak battery can easily prevent the engine from cranking. Check for corroded terminals or loose connections, which can also contribute to battery issues. Next, consider the fuel system; a clogged fuel filter or a malfunctioning fuel pump can disrupt fuel delivery, making it impossible for the engine to start. Additionally, the ignition system plays a crucial role in starting the vehicle, so inspect the spark plugs and ignition coils for any signs of wear or failure. If the starter motor is faulty, it may not engage properly, leading to starting difficulties. Furthermore, ensure that the alternator is functioning correctly, as it is responsible for charging the battery; a failing alternator can leave you with insufficient power to start the car. Lastly, be aware that the vehicle's security system might inadvertently prevent starting if it detects an issue with the key fob or immobilizer. By systematically checking these components, DIY enthusiasts can diagnose and potentially resolve the starting issues with their GLC63 AMG S.

How urgent is it to address the starting issue in a 2020 Mercedes-Benz GLC63 AMG S?

Addressing starting issues in a 2020 Mercedes-Benz GLC63 AMG S is of utmost importance, as the urgency can vary significantly based on the severity of the problem. If your vehicle fails to start completely, it is critical to act immediately to prevent being stranded or incurring further damage. Warning signs such as slow cranking, unusual clicking sounds, or dashboard warning lights should not be ignored, as they often indicate underlying issues that require prompt attention. Additionally, safety concerns arise when starting problems lead to unexpected stalls or failures to start in crucial situations, making it essential to resolve these issues swiftly. Regular preventive maintenance is also key; by addressing starting problems early, you can avoid more serious and costly repairs down the line. Ultimately, recognizing the urgency of these symptoms can save you time, money, and ensure your safety on the road.

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