Cauchi is currently Shane van Gisbergen’s race engineer; he previously skippered Jamie Whincup’s efforts between 2014 and 2020.
The experienced Cauchi has worked in Supercars for 14 years, and has helped Triple Eight to eight drivers’ titles.
That could become nine in 2021, with van Gisbergen leading the championship by 276 points.
Cauchi will lead the Braeside squad into its new solely Grove-owned era, but will also bring engineering and winning nous with him.
"I'm very excited and grateful to Brenton & Steph for the opportunity to join Grove Racing in 2022," Cauchi said.
"It's a new role and a thrilling opportunity in a team with a deep and long history in the sport.
"I am looking forward to being a part of this new chapter in their story."
Team co-owner Stephen Grove was delighted to secure the services of the title-winning engineer as the team readies for its new era.
Cauchi has helped van Gisbergen to 11 wins in 2021
"Once we went through the ownership changes, it was essential that we found the best possible person we could to help take on some of Todd's critical roles, and we believe we have found that person in Cauchi.
"He has vast experience and know that he will fit well into the family culture of the team.
"We look forward to him starting with us in 2022.”