Overview

Error 8602 is a common listing error that Amazon sellers encounter when the ProductID value submitted during product listing creation does not meet the format requirements for the specified identifier type. This error typically arises from issues with UPC or EAN codes and can prevent sellers from successfully listing products on Amazon's marketplace.

Key Points / What Sellers Need to Know

• Error 8602 signals a ProductID mismatch — This error fires when the identifier value you submit does not conform to the rules of the identifier type you selected, such as UPC or EAN.
• UPC codes must be exactly 12 digits — If you select UPC as your identifier type, the value you provide must contain all 12 digits, including the check digit.
• EAN codes must be exactly 13 digits — Selecting EAN as your identifier type requires a full 13-digit value with the check digit included.
• The check digit is essential — The final digit in any UPC or EAN code is a calculated check digit. Omitting it is one of the most common causes of this error.
• Leading zeros matter — Spreadsheet software often strips leading zeros from numeric fields, which silently corrupts your ProductID values.

Common Causes of Error 8602

There are three primary reasons sellers trigger this error. The first and most frequent is a missing check digit. The check digit is the last digit in a UPC or EAN barcode number, and it is mathematically derived from the preceding digits. Many sellers unknowingly omit it when manually entering codes, resulting in a value that is one digit too short. The second common cause involves leading zeros being dropped. When sellers prepare product listings using spreadsheet applications like Excel or Google Sheets, the software may interpret the ProductID column as a number and silently remove any leading zeros. A UPC that should read "012345678905" becomes "12345678905," which is only 11 digits and will fail validation. The third cause is simply selecting the wrong identifier type — for example, choosing UPC when the code is actually an EAN, or vice versa.

How to Fix the Error

To resolve Error 8602, start by confirming which identifier type your product actually uses. UPC codes are 12 digits long and are standard in North America, while EAN codes are 13 digits and are used internationally. Once you have confirmed the correct type, verify that your code includes all required digits, paying special attention to the check digit at the end. You can validate your barcode using the GS1 US website (gs1us.org), which offers a free check digit calculator. If you suspect your spreadsheet software is stripping leading zeros, reformat the ProductID column as text before entering any values. In most spreadsheet applications, you can do this by selecting the column, opening the format menu, and choosing "Text" as the cell format. This prevents the software from treating barcode numbers as numeric values and dropping significant leading zeros.