A non-integrated monitoring device and method for monitoring a subject vehicle includes monitoring, via a non-integrated sensor, a physical parameter being emitted from the subject vehicle. The physical parameter being emitted from the subject vehicle is analyzed to determine a dynamic signature for the subject vehicle. A baseline signature for the subject vehicle is obtained, and compared to thedynamic signature for the subject vehicle. Occurrence of a fault in a subsystem of the subject vehicle is detected based upon the comparing of the baseline signature for the subject vehicle and the dynamic signature for the subject vehicle, and the occurrence of the fault is communicated to an operator of the subject vehicle.