HELLO
I have a 2013 model Chevrolet Captiva and I have been experiencing the same problem for 2 years.An extremely loud knocking sound comes from the engine part of the vehicle (think of hitting the door hard over and over).Since I live in Turkey, I cannot take it to Chevrolet officials since there is no authorized service or dealer for Chevrolet here. Other vehicle repair technicians I took to said that this sound was coming from the engine injector at first, and even though I replaced it with brand new injectors, this sound still continues.And no one can still find where this knocking sound is coming from. I went to the Chevrolet homepage and tried to reach someone from the contact section, but they could not help.Can you help with this