Cruise control malfunctions in a Mercedes B Class, model 2010

Hello PauWa, I once had a similar problem with my Mercedes A-Class, model 2007, which also had problems with the cruise control and the on-board computer displayed "engine control unit defective". It turned out that my car's engine control unit was actually faulty. It is a serious problem because it is the brain of the engine and has control over many important functions such as ignition timing and fuel supply. The mechanic had to replace the entire ECU in my car. It was quite an extensive job, but afterwards the car ran perfectly again. So be sure to have it checked by a specialist garage. Hope this helps! Best regards

(Translated from German)

Hello, thanks for the quick reply! Well, that sounds like quite a job with the engine control unit from your A-Class. How much did it cost you, if you don't mind me asking? And did anything else go wrong afterwards or did everything run like clockwork again? Kind regards

(Translated from German)

Hello, yes, repairing the engine control unit was indeed not cheap and cost me €1000. But since then everything has been running like clockwork again, even the cruise control without function has been fixed. In my case, the visit to the mechanic was really worthwhile and solved all the problems. So if you experience symptoms similar to mine, I would also recommend having your car checked by a professional. Otherwise it could cause even greater damage. Best regards

(Translated from German)

Hi SchwarzHarald, Okay, that sounds expensive, but if it fixed all the problems then it was probably worth it. So I will take my car to the mechanic and have it checked. You never know what other damage could be in the offing. Thanks for the helpful insight, really appreciated! Stay healthy

(Translated from German)