The check engine light is likely related to the IMA problem, but we can't necessarily rule out some other problem. The CEL will blink if there is a serious, pull off the road right now, type problem. I'd still get that checked out. As far as driving without the IMA I'd first make sure you have a good 12 volt battery because the DC/DC converter could potentially loose power on you leaving the accessory battery to do the work. If it does do this and you have a 12 volt battery with enough capacity you might be able to just recharge it while your at home. If the DC/DC stops working and your 12 volt goes dead you'll be stranded, that would be my main concern.