Hello everyone. Sam, a customer service representative. Many people are curious as to what 'Quicken error cc-800' means. Quicken Error CC-800 arises while using internet services to update accounts. Additionally, Error Code CC-800 may occur while opening a bank account. Quicken Error Code CC-800 is most often caused by out-of-date Quicken software and compromised bank account passwords. This may be avoided by creating a backup.