Never share your PIN code to anyone, not even your family members or close friends.
Do not write down your PIN numbers, let alone keeping them in your wallet.
Do not let anyone see your PIN by covering your finger movements when pressing the pin pad buttons or entering your PIN.
Change your PIN periodically with unique numbers making it hard to guess by others.
Beware of any fraud attempt from someone who claims to be a BCA bank employee/official via phone call, fax or email - asking for your personal data, including PIN numbers. Because BCA employees or officials never ask about your PIN number in any kind or way.