What does decline code 55 mean?
Decline code 55 indicates the personal identification number (PIN) entered during the transaction does not match the one on file with the issuing bank. This typically occurs at point-of-sale terminals or ATMs where PIN entry is required for debit transactions.
This is a soft decline — the transaction was not rejected for account or card reasons, only because the authentication step failed. The cardholder can retry immediately with the correct PIN.
Why PIN mismatches happen
Simple mistyping is the most common cause, especially on small terminal keypads or in environments where the cardholder is rushed. Worn or unresponsive buttons on older terminals can also register incorrect inputs.
Cardholders who have multiple cards may confuse PINs between them. Banks assign different PINs to different cards, and remembering the correct one for each card can be challenging — particularly if the cardholder recently changed their PIN.
In some cases, a bank may reset the PIN as part of a security measure (after a fraud alert, for example), and the cardholder may not have received or noticed the notification about the change.
How to resolve decline code 55
The cardholder should carefully re-enter their PIN, taking extra care with each digit. If the terminal allows, confirm the numbers on screen before submitting. Most terminals give three attempts before temporarily locking the card.
If the cardholder has forgotten their PIN entirely, most banks offer self-service PIN reset through their mobile banking app, website, or by calling customer service. Some banks can send a PIN reminder via secure message.
As a temporary workaround, the cardholder can process the transaction as credit (signature-based) rather than debit (PIN-based) if the merchant and card type support it. This bypasses the PIN requirement entirely.
Important: PIN attempt limits
Most issuing banks allow three consecutive incorrect PIN attempts before temporarily locking the card. Once locked, the cardholder will need to contact their bank to unlock it — this is a security measure to prevent brute-force PIN guessing.
If the card is locked due to too many failed attempts, visiting a bank branch with photo ID is often the fastest way to get it unlocked and set a new PIN. Phone-based unlocking is also available at most banks but may require additional identity verification steps.
