The engine may develop a stalling and/or no start condition due to a failed crankshaft position sensor.Google+
Car Problem Reports
Mercedes-Benz CL55 AMG Engine Performance Problems Due to Crankshaft Position Sensor Failure
Mercedes-Benz CL55 AMG Problem
Visitor, 2003 Mercedes-Benz CL55 AMG, 76,000 mi
Engine cranked until timeout, but would not start after sitting in hot parking lot for three hours.
car will not start until it's cooled down.