Toyota Motor Corp. said Friday that the vehicle information of about 2.15 million customers may have been leaked after it was discovered its subsidiary's cloud computing system accidentally made the data accessible.

Potentially exposed information includes identification numbers and the location data of vehicles that have used Toyota's telematics services between November 2013 and April this year, though there has not been any indication that the data has been misused by a third party, the automaker said.

Its subsidiary, Toyota Connected Corp., said the main cause of the problem was its failure to have its employees thoroughly follow rules about the handling of customer data.

Toyota said measures are being taken to better monitor the cloud computing system at the subsidiary, which discovered the problem during an inspection.

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