Technician A says when diagnosing the TPMS using Techstream a Lost Communication with Vehicle message means the TPW ECU must be reset.?

Technician A is incorrect. A "Lost Communication with Vehicle" message typically indicates a communication issue between the TPMS (Tire Pressure Monitoring System) ECU and the diagnostic tool, rather than requiring a reset of the TPMS ECU. This could be due to wiring problems, a faulty ECU, or other communication failures that need to be addressed. Before considering a reset, it's essential to troubleshoot the communication pathways.