On 2007 and up GM vehicles, using conventional battery and charging systems tests can prove inconclusive. This is because of GM’s Electrical Power Management (EPM) system designed to monitor and control the charging systems and send diagnostic messages to alert the driver of possible problems. The EPM system primarily utilizes existing on-board computer capabilities to maximize the effectiveness of the charging systems, manage the load, improve battery state-of-charge and life, and minimize the system’s impact on fuel economy.
Tenneco’s Walker Emissions Control brand is helping automotive service providers simplify emissions control diagnosis and repair through a variety of new educational tools, including a recommended set of five checks to perform before installing a replacement catalytic converter. These diagnostic checks are covered in a free technical video available through the “TennecoInc” channel at YouTube.com.