June 19 (Reuters) - Retail technology and software provider CDK Global was investigating a cyber incident and had briefly shut all its systems down proactively, it said on Wednesday.

The company, which provides software to car dealerships, said its core dealer management system and digital retailing solutions had been restored.

CDK Global added that it had tested and consulted with external third-party experts after the incident.

"We are continuing to conduct extensive tests on all other applications, and we will provide updates as we bring those applications back online," the company said in an emailed statement to Reuters.

CDK's systems first went down around 2:00 a.m. EDT (0600 GMT) and some functions began to come back online by Wednesday afternoon, according to a report by Bloomberg News.

The company was bought by investment firm Brookfield Business Partners in April 2022 for $6.41 billion in cash in a deal that took private the last major publicly traded provider of software to auto dealers and manufacturers.

Ford, General Motors and BMW did not immediately respond to a Reuters request for comment sent outside regular U.S. business hours on whether the cyber incident had affected their dealerships. (Reporting by Juveria Tabassum; Editing by Josie Kao)