General Motors Co. announced six new recalls Monday and increased the amount it will spend on recall-related expenses to $1.2 billion during the second quarter.

The latest recalls cover 8.45 million vehicles in North America for a variety of issues. Chief among them is unintended ignition key rotation in older Chevrolet Malibus and five other models. The auto maker is recalling 8.23 million of those vehicles alone.

The auto…