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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Not starting a month after replacing battery

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: If I have low coolant and my car won't blow cold air could that be the problem?

Hey there, thanks for writing in about your 2003 C240 Mercedes-Benz. The low coolant light only means your engine coolant level is low in the engine cooling system. You may have a coolant leak. This has nothing to do with...

Q: After doing a head gasket on a 2002 3.9 Dakota, how long will it take after starting it will it take to start to run normally?

Unless your repair involved replacement or modification of engine controls, such as the IAC valve or throttle position sensor, the instant you start the truck after replacing just a, or both, head gaskets, the engine should operate normally. If the...

Q: Dead short in the electrical system.

I would ask for help from one of the mechanics at YourMechanic. They will have one of their mechanics come to you with the proper test equipment and knowledge to diagnose a fix the short in your electrical system.

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.