QuickBooks error 3003 erupts at the time of knowledge synchronization with Intuit administration and it fails. The time you tap on the Sync button, the error flashes on your display screen. And when the system encounters these errors, it's likely to crash or go very slow in performance. Learn What is the reason & how to fix QuickBooks Error Code 3003. If you are not able to fix call QuickBooks Error Support: 1(800)865-4183.