# 2012 Toyota Prius c whining noise **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** prius, toyota\ **Created:** [June 10, 2018, 12:15am UTC](https://community.cartalk.com/t/2012-toyota-prius-c-whining-noise/118960 "2018-06-10T00:15:46Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![AlWeiland](https://avatars.discourse-cdn.com/v4/letter/a/34f0e0/32.png) [@AlWeiland](https://community.cartalk.com/u/AlWeiland)\ **Post date:** [June 10, 2018, 12:15am UTC](https://community.cartalk.com/t/2012-toyota-prius-c-whining-noise/118960/1 "2018-06-10T00:15:46Z")
2012 prius makes a high pitch, sounds electrical, whining noise that is coming from the rear side of the transmission. Noise will occur during acceleration (with vehicle in park) and noise also increases with RPM at highway speeds. Does anyone have an idea what might be causing this? ---
**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\ **Post date:** [June 10, 2018, 12:29pm UTC](https://community.cartalk.com/t/2012-toyota-prius-c-whining-noise/118960/2 "2018-06-10T12:29:12Z")
Transmission oil could be low or deteriorating.How long since your last transmission oil service? ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [June 10, 2018, 2:53pm UTC](https://community.cartalk.com/t/2012-toyota-prius-c-whining-noise/118960/3 "2018-06-10T14:53:24Z")
Prius has a cvt trans sandwiched between an electric drive motor and engine. Many things that could cause issue. A dealer tech might be aware of common issues. Which may lead to large component swaps via warranty route. No warranty? We owned same car. Gone now. ---
**Author:** ![AlWeiland](https://avatars.discourse-cdn.com/v4/letter/a/34f0e0/32.png) [@AlWeiland](https://community.cartalk.com/u/AlWeiland)\ **Post date:** [June 21, 2018, 1:43pm UTC](https://community.cartalk.com/t/2012-toyota-prius-c-whining-noise/118960/4 "2018-06-21T13:43:35Z")
Thanks for the info, check fluid and found level to be OK. When checking, I found a fastener missing by the plastic cover over the oil filter. Replaced plastic fastener and high pitch vibration sound went away. Who would have guessed that this would produce this sound?