Mercedes Benz C230 wont turn over?

If your Mercedes-Benz C230 will not turn over, there may be a number of reasons why this is happening. Here is a checklist to aid in diagnosing the problem:

Battery Problems

Is the battery charged?

Are the terminals of the battery clean and properly attached?

Attempt a jump-start to eliminate a dead battery.

Starter Motor

Check for a click when you turn the key. One click may signal a bad starter.

If you hear rapid clicking, it may be a dead battery or poor contact.

Ignition Switch

Make sure the key is turning easily. Occasionally the ignition switch will also malfunction.

Neutral Safety Switch (automatic transmission only)

Make sure the gear shift is in 'Park' or 'Neutral.'

Try to start the car in both positions.

Fuses and Relays

Inspect the fuse box for blown fuses associated with the starting system.

Security System

Is the security light on? The car's anti-theft system may be keeping it from starting.

Try turning the key with the spare key.

Fuel System

You may hear a humming sound from the fuel pump when you turn the key to the "on" position.

Check to see if there is fuel in the tank.

Error Codes

If you have an OBD-II code reader, you can check for error codes. They can provide hints regarding problems such as crankshaft position sensor failure.