1. Method to monitor signal integrity in a control module for a hybrid powertrain system including a transmission and a plurality of torque generating machines connected to an energy storage device, the transmission operative to transfer power between an input member and the torque generating machines and an output member, wherein the control module performs the following steps comprising: determining an output torque command; calculating motor torque commands for the torque generating machines based upon the output torque command; determining torque corrections for the motor torque commands; adjusting the motor torque commands based upon the torque corrections for the motor torque commands; determining an input torque correction based upon the torque corrections for the motor torque commands; determining an actual input torque to the input member; estimating an output torque based upon the actual input torque, the input torque correction, and the adjusted motor torque commands; and comparing the estimated output torque and the output torque command.