A system and method are provided for generating and detecting unique identification signatures for customer replaceable components or units (CRUs) for use in customer owned and/or controlled image forming devices. The disclosed systems and methods employ characteristics and circuitry of the CRU itself to avoid sole dependence on the information provided in ac electronically-readable monitoring module to provide security against fraud and to provide compatibility matching. An uncharacteristic operating signature may be introduced in a non-functional zone of an operating parameter including one or more voltage spikes of a specified amplitude and duration. Comparing the voltage spikes to a set of predetermined profiles provides identification for the CRU. A unique automated, machine-readable manner by which to identify a CRU is provided that does not require an externally-readable monitoring module or any other identifying label to be mounted on, or otherwise associated with, the CRU.