Skip the auto shop - Our mechanics make house calls

Q: Not starting a month after replacing battery

asked by on

Car is not starting. It has sat in my garage for a long time. Initially, I was told it was the battery. I replaced the battery and it worked, but a month later it is doing the same thing.

The information that has been provided for your Mercedes is limited which unfortunately makes it difficult to point you in the right direction. So I see originally that a bad battery was the first culprit. Allowing a vehicle to sit for a long period of time with the battery connected can cause the computer to slowly drain the battery. It is possible that this exact thing has occurred again after replacing the battery. One thing you can try is to have a friend help you jumpstart your vehicle. If you are able to get the vehicle started this way, it is likely that either the Mercedes has not been driven enough and that the car’s computers are draining the battery power, preventing it from starting. It is also possible that you may have a parasitic draw on the electrical system. A parasitic draw is when a component in the vehicle draws excess power from the battery, even when the key is off. To be 100% certain on why your Mercedes is experiencing this issue, it may be time to enlist the assistance of a certified mechanic. They will be able to perform an electrical diagnostic on your C240 and identify exactly why your Mercedes is having trouble starting. They will also be able to assist you in making the repairs necessary to prevent this situation from happening again.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car hesitates when I accelerate

There are many possible reasons as to why a vehicle may hesitate on acceleration. If the Check Engine light has come on I would recommend having the vehicle scanned for trouble codes. Modern gasoline engines run highly sophisticated engine control...

Q: Cranks but won't start

You are right on track. You may be dealing with several issues at once. The first thing you should do for this starting issue is check for proper spark. You need to check with an actual tester, and do a...

Q: Car Won't Start went

Hello, thanks for writing in about your Ford Explorer. You would know if the alternator was at fault if it died while you were driving it and then would not crank. I would suggest replacing the battery and then have...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...