Any Ideas? Here Are The Codes! P0420 - Catalyst System Efficiency Below Threshold (Bank 1) P0430 - Catalyst System Efficiency Below Threshold (Bank 2) P1636 - HV ECU Malfunction P3000 - HV Battery Control System Malfunction P3001 - HV Battery ECU Malfunction P3029 - Battery Block 19 Becomes Weak P3030 - Disconnection Between Battery And ECU P3100 - HV ECU Malfunction P3105 - HV Battery ECU Communication Circuit Malfunction C1259 - HV System Regenerative Malfunction C1310 - Malfunction In HV System
You need to open the HV battery covers and look at the HV computer and connections for corrosion or burnt wires, replace as needed. Replace weak module. Your catalytic convertor may be blocked with soot or no longer working.
If I open the hv battery, do I need the 12v Disconnected? Were in the battery would I find a burned wire?
If you can't afford a trained technician, I suggest you look at YouTube videos for how to uncover and inspect Gen 1 Prius HV battery. Yes you need to disconnect the 12V &HV batteries
