Problem: The battery went dead overnight. The owner tried to jump start the vehicle but the engine would not crank over. It was towed to the shop.
Details: When it arrived at the shop, the malfunction indicator light was off and there were no DTCs on any modules. The Tech-Assist consultant advised the shop to unplug the battery for about five minutes to reboot the modules. After the reboot, the engine would crank and run with a jumper battery connected.
Confirmed Repair: The technician performed a full charging system test and found the battery to be defective. He replaced the battery and the problem was fixed. NOTE: Losing power and/or being boosted will sometimes cause glitches in certain modules – rebooting them often fixes any issues.