Q: i plugged my negative cable on my mercedes 2008 c300 before positive what could i have messed up

asked by on

I was replacing my battery then plugged the negative terminal in first it not it says esp failure

As long as you did not reverse the polarity of the battery (i.e., connect the negative terminal of the battery to the positive side of the vehicle electrical system and connect the positive terminal of the battery to the vehicle ground) or short circuit the battery what you are describing is harmless. Connecting the ground terminal last is simply recommended to avoid short circuits. If you didn’t short circuit anything, then you needn’t worry. If after replacing the battery you are experiencing electrical problems, that may be due to the PCM/ECM having lost stored information or possibly the engine immobilizer system is operational. If you are experiencing an electrical problem with the vehicle, please request an electrical diagnostic and a certified Mechanic, dispatched by YourMechanic right to your location, will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. i plugged my negative cable on my mercedes 2008 c300 before positive what could i have messed up

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: XM satellite radio doesn't display full lines

Hello. It sounds like the display screen is malfunctioning and this is causing the problem you are having. The only way to fix this problem is to replace the radio unit it its entirety. The radio unit can be very...

Q: The Adaptive stability control went out on my car I took it to a local mechanic he said he thinks the throttle is going bad he unh

Unfortunately, the cause of your concern cannot be determined without visual inspection and further testing. While it is possible that your throttle position sensor may be faulty, it is more than likely that it could be a wheel speed sensor...

Q: Do I have to reset any settings after changing battery and does the hose on the side of factory battery need to be re connected.v

Yes. You will need to reset your settings. Usually the dealer can do it free of charge but no promises. If you take a battery off and put a new one on, if there was anything hooked up the the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...