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Mercedes Starting Issue

What Causes Starting Issues in Your Mercedes?

Posted on January 25, 2022 by smikyautomowp

Starting issues in a Mercedes is a common concern that the drivers can face from time to time. The engine may click but won’t start, or perhaps it dies out after cranking up. Maybe your car turns over but the engine won’t keep running. Sometimes, the key doesn’t even turn in the ignition. It is best to understand some of the potential causes of problems starting your car before deciding the right course of action.

The Battery

The battery of your car might last up to a decade with proper care and maintenance; however, a replacement should be considered around six or seven years. There could be corrosion or rust developing on the connectors, which could lead to battery failure.

In addition, if you live in a colder environment, the battery could lack proper insulation. Sometimes, the issue can be as simple as a low battery. In that case, try to trickle charge the battery using a 12-volt battery trickle charger.


A burnt fuse of one of the systems can cause an issue while trying to start your car:

  • Starter Circuit
  • IES
  • Ignition
  • Fuel Pump

You can use any digital multimeter to test a fuse quickly, easily, and without removing it. Check all the systems of your car, and if a burnt fuse is found, replace it with a fuse of the same ampere rating.

The Drive Authorization System

In some instances, the Drive Authorization System does not allow the car to start.

  • The car will not start if the brake light switch is not functioning properly. You might notice this problem if you can’t get your car out of park. A stuck gear shift is one of the most prevalent issues in a Mercedes. If the brake light switch is the cause, it needs to be replaced with a new one.
  • If you have a newer model, it likely has an advanced security system with SmartKey. It protects your car against theft but, in a case of malfunction, the Drive Authorization System can fail and prevent the car from starting at all. You can try using a spare key, as sometimes the key is at fault and not the system. However, if the system is not functioning, you should call our professionals.

Fuel Issues

Multiple things can be at play here. The fuel you used could be contaminated or the wrong type, or the fuel pressure might not be working. You can check this by using a fuel pressure gauge with a Schrader valve adapter. There could also be issues in the combustion process in the fuel system.

The list of causes can go on and on since it is such a complex machine. If any of these symptoms sound plausible or a replacement of any part is required, it is best to contact our certified technicians. Repairing a Mercedes yourself can cause further problems if the correct procedure is not followed, which can result in a waste of money and time. It can compromise your safety as well, since this can involve electrical components that can shock you.

SMI Automotive Service Will Expertly Resolve Any Issue

For over 50 years, St. Matthews Imports Automotive Service has proudly served Louisville, KY. We employ top ASE-Certified technicians who are rated an A+ with the BBB. We were also the Leo Readers’ Choice Winner. Moreover, St. Matthews Imports has 300 reviews on Google by satisfied and happy customers, giving our Hubbards Lane location for automotive service and repair nearly a 5-star rating across the board.

Mercedes Battery Inspection

We are committed to delivering the best quality repairs and our priority is customer satisfaction so you can trust us to take care of your Mercedes. We always use the latest factory-grade tools and only use OEM parts for any repairs, so the quality is always guaranteed and you can drive with confidence.

As rated Louisville’s #1 German Auto Repair Shop for automotive service and repair, we believe we’re only as good as our workmanship, so we offer a 12-month/12,000-mile warranty on parts and labor. We are dedicated to helping you with any issues you might have, so message us on our website or call us at (502) 896-0305 to schedule an appointment and let our certified mechanics take care of the rest.

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