1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Engine continues to rev after foot is taken off accelerator

Discussion in 'Prius c Care, Maintenance and Troubleshooting' started by MRG3948, Apr 28, 2015.

  1. MRG3948

    MRG3948 New Member

    Joined:
    Apr 28, 2015
    1
    0
    0
    Location:
    Cary, NC
    Vehicle:
    2013 Prius c
    Model:
    Three
    The engine continues to rev after I take my foot off the accelerator. Does it under many different conditions, but especially the engine needs to be warmed up for it to do this. Toyota just called to say there is nothing wrong with it, even though I had a technician drive it and tell me "this is messed up!" Apparently the master technician that worked on it today didn't have a clue. Under warranty and will fight it! What is wrong with the car? Thank you for any help.
     
    #1 MRG3948, Apr 28, 2015
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,166
    50,060
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    welcome! is it burning off excess energy? how long have you had it and when did it start?
     
    #2 bisco, Apr 28, 2015
  3. mmmodem

    mmmodem Senior Taste Tester

    Joined:
    Nov 17, 2011
    2,732
    1,703
    0
    Location:
    Bay Area, CA
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    Just a tip, you should list the conditions it is reving. It might help others in diagnosing the problem.

    Just off the top of my head, my engine revs when it is cold or when battery state of barge drops below 3 bars. That is completely normal.
     
    #3 mmmodem, Apr 28, 2015
  4. Ghoti

    Ghoti Member

    Joined:
    May 14, 2004
    101
    10
    0
    Location:
    Arizona
    Vehicle:
    2012 Prius c
    Model:
    Three
    If the hybrid battery is overcharged, or nearly so, the car will spin the engine (without burning fuel) to bleed off excess charge so at to not damage the battery. This can be disconcerting as it really can sound like the engine 'revving' to uncomfortably fast RPMs, but this is normal behavior.

    Does this tend to happen, for example, after going down a long hill where you're using the regenerative brakes all the way down? This is a textbook recipe for this scenario.

    If the battery SoC (State of Charge) indicators are not showing the hybrid battery as "full" when this happens, there may be something else going on. As another poster mentioned upthread, details would be helpful.
     
    #4 Ghoti, May 12, 2015
(You must log in or sign up to post here.)