No Start Big Problem

Testing Batteries before doing an Auto Diagnostics is important to make sure all Voltages are correct so test readings are not off. Also a CCA or Cold Cranking Amperage is a good sign of soon to fail Battery. On Newer Vehicle Battery in more important than ever because not only is it turning the Starter but powering up Engine Control Modules and other Security Module that when Voltage drops when Cranking could cause them not to work properly. This leads into not all Batteries are created equal. Your Car or Truck may Require a certain rating and other Batteries may fit but not have truly what you need. Always ask your Service Advisor what is the best option for your Car Battery.