Made the mistake of doing a full drain and refill on my transmission fluid at 180k. There is now a slight hum/vibration when the engine is on. Which functions can I check using an ELM327 that could help me diagnose?
Welcome to Prius chat. Some questions: How many quarts of fluid did you put back after draining? What fluid did you use? Any dash lights on? Is the noise or vibration only on when the engine is on? Good luck and keep and keep us posted .
I got it done at a shop so I'm not sure if they refilled the full 4 or the exact same amount that was drained, but I can get that info if its important. I know sometimes less than 4 will drain out. I made sure they used Toyota fluid. There are no dash lights. And yes, only slight noise/vibration when the engine is on. It speeds up as I speed up and slows down when I slow down. Thanks for answering! Also, I have driven the car for two weeks with no dash light, including two longer drives, around an hour and a half each.