Hey Kevin, while that might be correct 90%, any code above 89 is for "manufacturer codes" (Truck management module inputs to the logic) and these codes can relate to whatever the manufacturer's engineers or techs have chosen, they are outputs that the manufacturer decides the order of, so it might be motor temp, or brush wear indicators, and what sensor is for what code may have as much to do with the order someone put wires back on to a truck management module, than what the book says they go to. I know in my life I have spent days wondering why I get a motor over temp code when it turned out the problem was the brushes were worn out.