No idea. Is BCA affiliated to any other international banks operating in Malaysia, i.e. Maybank, HSBC, etc? If it is, you shouldn't have problems. You also have to look at all those logos on the back of your card. If any of them tie up with those on Malaysian bank cards, once again you shouldn't have any problems. Best bet is to contact BCA customer service and ask them direct.
I have just had a look at my BII card, which I have used extensively in Malaysia... the logos are ALTO, CIRRUS and MAESTRO. However, BII is affiliated with Maybank, so I don't know whether this makes a difference too.