One problem related to automatic transmission has been reported for the 2006 Mercedes Benz C230. The most recently reported issues are listed below.
We own a Mercedes Benz C230. The check engine light came on. We took it to the dealer and it was diagnosed with a balance shaft error. It turns out the balance shaft is broken. The part cost only about $400. But since replacing it requires pulling out and taking a part the engine, the repair is over $3000. We have been advised not to drive the vehicle. It has not been repaired.