From PocketWizard Wiki
General Nikon Operational Considerations
The following operational considerations apply to all Nikon cameras unless otherwise noted.
Flash Sync Speed - Custom Camera Setting
When using a Nikon camera and ControlTL radios, the camera's "Flash Sync Speed" setting must be set to the slower shutter speed of the two "Auto FP" options. This setting can be found in the "Bracketing/Flash" Custom Settings menu.