After you get the codes, disconnecting the 12 volt battery for a few minutes will reset the car and may make it "driveable." Some IMA codes are not detrimental, like the one for "excess heat." But driving with those codes makes the car want to baby the IMA battery. Stopping assist or regen, or failing to charge the 12 volt battery. Your battery may still be capable of functioning normally, resetting the cars computers make it behave.
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