Identifying Faulty MG2 on a Toyota Prius 

Have same issue with a 10' HS250h p0a94 - 127 only shows when going downhill seemingly at over 55mph... currently troubleshooting, new to hybrids, very tough to find info on this

I have Camry hybrid 2011 cv 40 when I drove down hill with speed more than 70 k/h . My car show warning check hybrid system with POA 94 . Toyota dealer check everything ,in end they said I need to replace transaxle But car run good on straight road I think it's something else wrong Can u please tell me what else can be wrong if I keep driving

I have Toyota Prius 2007 the car come with engine light too many others light but the code coming on is P0A4B ALTERNATOR POSITION SENSOR CAN YOU PLEASE HELP ME WITH THE WHAT SHOULD I REPLACE OR FIX THANKS