Mercedes-Benz CL-Class 2006 Owner's Manual page 477

Practical advice
Troubleshooting
Problem
The engine will not start. You cannot hear
the starter motor working.
The engine is not running smoothly and is
misfiring.
456
Possible cause/consequence
The on-board voltage is too low because
the starter battery is too weak or dis-
charged.
The starter motor has overheated.
The engine electronics or a mechanical
component of the engine control unit have
been damaged.
Suggested solutions
Jump-start the vehicle ( page 497).
If the engine does not start despite at-
tempts to jump-start it:
Consult a qualified specialist workshop.
Allow the starter motor to cool down for
approximately two minutes.
Restart the engine.
If the engine still does not start:
Consult a qualified specialist workshop.
Only depress the accelerator pedal gen-
tly.
Have the cause rectified immediately at
a qualified specialist workshop.
Otherwise, unburnt fuel may get into the
catalytic converter and damage it.