For this one Mike used a GM Tech 2 scan tool to watch the states of the modules by using the Class 2 Message Monitor. 2008 Chevrolet Tahoe with an amperage draw over 1 amp. 2011 Dodge Challenger with a draw of nearly 2 amps with no codes. The article includes 3 case studies with different solutions: I think more than any other component, the battery is the most overlooked item when it comes to testing for a parasitic drain. The first step to diagnosing any parasitic draw starts with what’s being drawn down to begin with - the battery. In this article originally published in Motor Age magazine, Mike explains how he approaches these types of jobs, it all starts with the basics.įor the most part, it will almost always be a long process to track down the cause of a parasitic battery drain in a late-model vehicle, as there are so many modules, accessories and networks involved. "If there is one job I never look forward to, it's a parasitic battery drain on a late model vehicles," says Mike Miller, a tech with a degree in mechanical engineering.
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