This is a common occurance when grout is used. The wall moves in one way while the counter/cabinets move in another, and the movement shows as separation at the joint. It would be better to remove as much grout as possible so the new caulk can bite and hold in the joint rather than just on top of the old grout. By being on top you will either have a thin veneer of caulk that could also crack with movement or you would have to put a heavy bead down that would not look as nice.

the right way is to remobe all the grout and caulk it with a matching caulk. the grout manufacturer should have it.

of course you can caulk over ot or regrout it, but you wil lbe revisiting this issue much more frequently if yo udo.

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The right way and the wrong way.

Do it right everytime.

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Thank you for your responses. I was afraid that the correct way would be to remove the grout and then caulk it. I ended up calling the kitchen company that installed our counter and backsplash. They said that they will take care of it.

So what is the easiest way to remove grout before caulking?

Sometimes a utility knife will get the grout out if it is already fairly loose. Otherwise a stiff putty knife or whats known as a 5way tool, looks like a scraper, will do. An electric tool, called a multi-tool (Fein, Craftsman, Bosch, Rockwell, to name some) is more expensive, plus the cost of the blade, but a lot easier on you.