HV Battery ECU Testing

This ought to be good. I kind of doubt it but should be interesting there's probably a way to eliminate it in the troubleshooting but again this car has a three manual set and I'm sure just the troubleshooting of the battery ECU and it's related business is probably quite lengthy and usually it's behind a pay wall so there's always that You can get a PDF copy of the manual You can read that whole section which I can't even imagine how long that might be there seem to be two iterations of the HV battery control module two different color labels and so on I don't know that I've ever seen one bad what I do see is when you open them up the bars from the receptacle to the board can be corroded with this white buildup once you knock that down with some contact cleaner You can make it look new again usually when they go back in they just work I don't know that I've seen one failed I've swapped them from a red to a black label and vice versa before with seemingly no changes anything happening. And apparently that ECU is pretty expensive.

 

C1310 is a code from the brake/skid ECU, and only means it knows about code(s) from the hybrid system. If you've got Techstream, that should also show you what the hybrid system codes are. Those will start with a P (the hybrid system is considered part of the Powertrain). What are they?

 

P1121 is a powertrain code, but it's from the engine. There should be some other P code being shown from the hybrid system, to explain why the brake C1310 code is there. But it might be hard to see from Tennessee.