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IMA = Integrated Motor Assist, so basically there's an issue with the hybrid electrical system and due to the age of the vehicle its very likely to be a battery thats come to the end of its life
In the U.S., the average hybrid car battery lasts for six to 10 years. When your battery’s time is almost up then the IMA light will turn on.
so idelally the next step is to plug the car into a scan tool that can pull off the IMA code and so confirm if a new battery is the issue and if it is then there's a relatively new service offered by a few firms where the battery pack can be reconditioned and its useful life extended
so I'd next get in touch with a firm like: