If your PR card has expired, then you must apply for a new one before leaving Canada on your trip. If your PR card is about to expire, you will need to apply to the Immigration, Refugees, and Citizenship Canada (IRCC) to renew your PR card.

Requirements for PR Card:

You need to meet the following requirements to apply for a PR card:
• You will need to provide information about your travel history, updated address, and employment history for the last 5 years. This information is used to assess if you have met the Permanent Residency Obligations
• As a permanent resident, you are required to spend 730 days in the last 5 years in Canada. This is known as the residency obligation. If you do not meet these requirements, your permanent resident card will be refused.
If you do not meet the residency obligation, your permanent residency will also be revoked.