QuickBooks Desktop usually shows up Payroll Update Error 12002 when it can’t connect to the internet. It’s a common QuickBooks error but can hold you back from completing your task. Other QuickBooks errors similar to 12002 are error 12009, error 12007 and error 12029. In this blog post, we are going to describe all the major causes and solutions to fix the QuickBooks error code 12002.