Skip the auto shop - Our mechanics make house calls

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 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
  • Home
  • Questions
  • 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: Radio interior lights IOD

Since the problems go away when the radio harness is unplugged, this sounds like a bad ground, or loose power supply connection related to that installation. The Ignition Off Draw fuse is on the main fuse block. Your Owner's Manual...

Q: I just got an oil change, but smoke is coming from under the hood of my car where my coolant tank is? Do I need more coolant?

Hello. If the smoke is coming from the coolant tank then it may actually just be steam from the hot coolant, which is normal as long as the engine is not overheating. I would double check the coolant level though,...

Q: Are there 2 camshaft positioning sensors to replace on this car

You actually have four camshaft sensors. Two on each head and one for each camshaft. There is likely a deeper issue that should be diagnosed. 1208 is "Constant adjustment of intake camshaft or right cylinder bank in direction retarded."...

Related articles

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...
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...
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...