Hello I have a 08 Prius that I bought knowing it had a"bad" trans. 12v battery was dead charged it drove it 4k miles no codes lights etc. Mileage was mid high 30s I don't drive economically. Then one day I got off the freeway and it got jerky clunky coming to a stop equally so starting off got to my parents house OK. When leaving later that night started off really clunky but once moving felt OK got on freeway lost power has to start and stop many times to get to parents house. Towed it home checked mg1/2 with insulation tester 550m ohm on all 6 leads battery is original but not weak. Code p0a78- drive motor a inverter performance Code p0a7a- generator inverter performance Code p0a90- drive motor a performance Code p3000- battery control system Car will turn on start and charge battery but when you move it į feels like a bad winding in an electric motor I'm leading to a bad inverter but any thoughts are welcome. My first Prius 2 months of ownership
First you will need to have the prius properly scanned OR pick up a scanner that reads DTCs and INFs (subcodes potentially related to a DTC), the least expensive option might be a mini-vci cable with the techstream software That one DTC p0a7a alone has over 10 different INFs (subcodes) that could be associated with it Without the proper DTCs/INFs it would be difficult to offer any thoughts beyond obtaining such Question (data reference really), when was the last time the transmission fluid was change (if known).
Hey turbo, Are you saying the stator coils the on MG's both read over 550 Megohms to ground? If so, I think that's too high a reading and may indicate a meter malfunction. Here's another example of a failed T/A, an '06 picked up from the local dealership that was diagnosed as having bad tranny, but all codes had been cleared. The vehicle ran ok and all systems working fine, just around the neighborhood for about a month (I didn't have it licensed for the highway). Finally got a P0aa6 along with subcodes 526 and 613 (indicating a problem with mg2), plus I started feeling extra vibe and hear some extra noise from the inverter. Long story short, tore down transaxle and found a bad mg1 stator coil.
