2012 Prius Check Hybrid System Codes

i think it unlikely the battery and brakes went simultaneously. i would check the 12 volt health and get a scan from tech stream.

 

Sounds like hybrid battery fault, low voltage will bring up the other codes too

Posted via the PriusChat mobile app.

 

The C1241 tells you that inadequate electrical power was arriving at the brake system. Sometimes that's a problem with the 12 volt battery, sometimes it's something else on the way from there to the brake system where the power was measured. So some troubleshooting needs to be done; the C1241 section in the repair manual will suggest how.

Toyota Service Information and Where To Find It | PriusChat

With inadequate power arriving at the brake system, it might be hard for the pressure pump to build up pressure, and as a result the pressure might be low, so don't panic about the C1252 and C1256 unless you still get them after fixing whatever's causing the C1241.

There's no causal relationship in either direction between those things and the P0A80. That's just another thing.