Cause of error code 8015D003

There might be problem with your Xbox Live Profile

Solution for error code 8015D003

Step 1:

Visit Microsoft account. If you forgot your password or it doesn’t work, reset your password. Please click this link > Sign In to Microsoft Account
Click Edit security info.
Verify your security information. For example, verify the Phone number, Alternate email address, and Security question information.
Sign out of your Microsoft account, and then sign in again.
Try to sign in to Xbox LIVE again.

Step 2:

Press the Guide button on your controller.
Go to settings and select System Settings.
Select Storage or Memory.
Highlight any storage device, and then press Y on your controller. (It doesn't matter which storage device you select; the cache will be cleared for all storage devices.)
Select Clear System Cache.
When prompted to confirm storage device maintenance, select Yes.