I think its 5 attempts. If you could not clear pcc in 5 attempts you have to re register.

registration is valid for 5 years..

https://www.icai.org/post.html?post_id=666

hi Kalpesh u r wrong, registration is valid for 5 years.

III.  PCC & PE-II:  The registration for PCC/PE-II Course will be valid for a period of 5 years from the date of initial registration