DTC P1211: TCS Control Unit: Description
WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
The malfunction information related to TCS is transferred to ECM via the CAN communication line from "ABS actuator and electric unit (control unit)".
Always erase the malfunction information such as DTC not only for "ABS actuator and electric unit (control unit)" but also for ECM after TCS related repair .