One problem related to ignition module has been reported for the 2001 Mercedes Benz C320. The most recently reported issues are listed below.
I just bought the car and two days later the Smart key won't turn, can't unlock the steering wheel and the shiffter the good think the car was parked on my drive way call tow truck take to the shop and they say I need a new key and ignition control module but only dealer can do that, $1,400. 00 dollars job.