Matrix diesel engine stalling and power loss

Hey! I had something similar happen with my Matrix – not sure what year yours is. For me, the check engine light kept popping up, and the fuel economy was terrible. It was like the car was choking! Have you checked your fuel efficiency lately? That might give you a clue. It could also be a dodgy sensor somewhere.

I have observed a slight decrease in fuel efficiency. Could you elaborate on the specific symptoms you experienced and whether your issue was linked to the high pressure pump, or perhaps another component of the fuel system?

Well, the rough idling was the worst part, it felt like the engine was going to jump out of the hood! I tried a few things, but honestly, in the end, I just took it to a workshop. They said it was the high pressure pump and that the fuel volume regulator was also shot. It sounds pretty much like what you're describing. Maybe get it checked?

Following your advice, I consulted a qualified technician who confirmed the diagnosis: a defective fuel volume regulator, stemming from a faulty high pressure pump. The repair cost amounted to 1510€.