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A vehicle's battery voltage can be monitored on the oMM using different "stats".
When equipped with Sierra Wireless' add-on module, the ControlModuleVoltage can be used to monitor battery voltage. If you do not have the Telemetry, module, use the Mainbattery stat. Note: the Telemetry stat Battery only checks for the electrical connection between the scantool and the truck. Therefore it should not be used for monitoring battery voltage.