Microsoft has updated the following KB Article:
How to troubleshoot software update deployments in System Center 2012 Configuration Manager
When you deploy software updates in System Center 2012 Configuration Manager (ConfigMgr 2012 or ConfigMgr 2012 R2), you typically add the updates to a software update group and then deploy the software update group to clients. When you create the deployment, the update policy is sent to client computers, and the update content files are downloaded from a distribution point to the local cache on the client computer. The updates are then available for installation on the client. Normally this process is completed successfully with little effort. However, issues may sometimes arise that cause update deployment to fail. In the “More Information” section, we cover the two most common failure scenarios and provide troubleshooting suggestions for each.