Mercedes-Benz 2012 C-Class Operator's Manual page 143

Problems with the engine
Problem
The engine does not
start. The starter motor
can be heard.
The engine does not
start. You cannot hear
the starter motor.
Possible causes/consequences and M Solutions
There is a malfunction in the engine electronics.
R
There is a malfunction in the fuel supply.
R
X
Before attempting to start the engine again, turn the SmartKey
in the ignition back to position 0 or press the Start/Stop button
repeatedly until all indicator lamps in the instrument cluster go
out.
X
Try to start the engine again (
long and frequent attempts to start the engine as these will drain
the battery.
If the engine does not start after several attempts:
X
Consult a qualified specialist workshop, e.g. an authorized
Mercedes-Benz Center.
The on-board voltage is too low because the battery is too weak
or discharged.
X
Jump-start the vehicle (
If the engine does not start despite attempts to jump-start it:
X
Consult a qualified specialist workshop, e.g. an authorized
Mercedes-Benz Center.
The starter motor was exposed to a thermal load that was too high.
X
Allow the starter motor to cool down for approximately two
minutes.
X
Try to start the engine again.
If the engine still does not start:
X
Consult a qualified specialist workshop, e.g. an authorized
Mercedes-Benz Center.
I n f o r ma t i o n P r o v i d e d b y :
Y page 138). Avoid excessively
Y page 301).
Driving
141
Z