Peugeot 407 Cruise Control Failure

I had something similar happen on my Peugeot 407. I'd check the throttle body actuator. The actuator controls the throttle plate in response to signals from the ECU (Engine Control Unit). If it's faulty, it can definitely mess with the cruise control system.

Thanks! Is there any easy way to test the throttle body actuator or the connection, or am I better off just taking it in?

Honestly, without the right diagnostic tools, it's tough to pinpoint the exact problem. The error codes can be vague. I chased a similar issue for ages before finally admitting defeat and taking it to a workshop. They found a defective plug connection on the component. Cost me 95€ to sort out.

Appreciate the insight! Sounds like a trip to the shop is in order. 95€ isn't too bad. Seems like a faulty system, but I'll mention what you suggested about the throttle body actuator and the possibility of a defective cable or plug connection.