My friend's Roadster threw the following VDS code below. Turns out it was a bad cooling pump. Adding as reference for others, couldn't find any hits on TMC regarding this code. If someone can point me to the wiki that has the master codes/id I'd be happy to add unless you beat me to it. Below is what was experienced: Roadster version: 1.5 Issue: "Battery Problem Power Reduced with ID:600 and Data:0x0000001 error code. It also lit up the yellow "fault" word/light in the speedometer..." Fix: " ....problem was low coolant flow, they replaced the coolant pump."