DTC P1211: Abs/TCS Control Unit (3.5L): Description
WARNING: This page is about a different car, the 2002 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
The malfunction information related to ABS or ABS/TCS is transferred through the CAN communication line from ABS actuator and electric unit to ECM. Be sure to erase the malfunction information such as DTC not only for ABS actuator and electric unit but also for ECM after the ABS or ABS/TCS related repair.