Mercedes Won’t Start? Causes & Fixes

mercedes wont start

Table of Contents

Mercedes Won’t Start? Causes & Fixes

Mercedes-Benz is a luxurious vehicle brand that epitomizes elegance, power, and safety. But what happens when your Mercedes won’t start? Being stuck on the side of the road with an unresponsive car can be frustrating; so in this article, we will look into common causes for Mercedes not starting and potential solutions.



A vehicle’s battery is an integral part of its electrical system, including the engine. Its primary role is to start up the engine; when it dies, your car won’t start. Here are some symptoms that indicate a dead battery:


  • Interior lights are dim or nonexistent, and headlights do not illuminate properly or are weak.
  • The engine makes a clicking noise but won’t start.
  • Power windows and electronics malfunction.


If the battery is dead, it needs to be recharged or replaced. Recharging requires both a charger and power source; however, when reaching the end of its usefulness cycle, replacement is recommended.


Fuel System

The fuel system is responsible for supplying fuel to an engine to power it. A malfunction in this area can cause Mercedes to not start. Here are some potential symptoms associated with a fuel-related issue:


  • The engine starts but fails to start.
  • The engine runs for a few seconds before dying.
  • The car stalls while driving.


When experiencing fuel system issues, three components must be examined: the pump, injectors and filter. The fuel pump pulls the fuel from the tank and delivers it to the engine; injectors ensure proper timing and quantity of injection; and finally, a fuel filter removes impurities in the fuel.


Ignition System

The ignition system is responsible for starting an engine and is made up of spark plugs, an ignition coil, and a distributor or module. A problem in this area can cause Mercedes to not start. Here are some symptoms associated with ignition-related issues:


  • The engine cranks but does not start.
  • The engine runs rough or stalls out.
  • The engine misfires.


The spark plugs ignite the fuel mixture in an engine; however, if they become worn or dirty, they may not create enough spark to light the mixture. On the other hand, ignition coils provide that spark that ignites the fuel mixture; if faulty, your car won’t start.


Potential Issues

Other potential problems exist as well.

Mercedes may fail to start due to a variety of potential issues, such as an alternator, starter motor, fuses or relays. The alternator is responsible for charging the battery and powering the electrical system after an engine starts. If it malfunctions, the battery will eventually die, preventing your car from starting. The starter motor is responsible for starting the engine when you turn the key. Without it, your car won’t start.

Fuses and relays are responsible for controlling the electrical system in a car. If they malfunction, this system won’t function correctly and your car won’t start.


Photo of Mercedes-benz Grille



If your Mercedes won’t start, it may be due to one or more of the reasons mentioned above. The first step should be diagnosing the issue based on the symptoms listed. If you can’t figure it out yourself or fix it yourself, we recommend you speak to a Mercedes mechanic online or locally.


FAQs (Frequently Asked Questions)

How long should a Mercedes battery last?

On average, Mercedes batteries last between two to five years depending on usage and driving conditions.

How Much Will it Cost to Replace a Mercedes Battery?

Replacing a Mercedes battery can range in cost from $100 to $300, depending on the model.

Will a Mercedes start with a bad alternator?

No, cars with damaged alternators won’t start and eventually the battery will die.

How Often Should I Replace My Mercedes Spark Plugs?

According to Mercedes, spark plugs should be replaced every 30,000 miles or two years, whichever comes first.

Should I Use Premium Fuel in My Mercedes?

For optimal engine performance and efficiency, it is recommended to use premium gasoline in Mercedes.

Chat With a Mechanic?

24/7 Expert Mechanics To Help Solve Any Issues Your Having.


Chat With a Mechanic?

24/7 Expert Mechanics To Help Solve Any Issues Your Having.

Leave a Reply

Your email address will not be published. Required fields are marked *