2017 V Trip MGP Error

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by Kenny94945, Nov 10, 2025 at 1:04 PM.

  1. Kenny94945

    Kenny94945 Active Member

    Joined:
    Mar 24, 2016
    847
    422
    0
    Location:
    Sausalito
    Vehicle:
    2016 Prius v wagon
    Model:
    Four
    My per trip dash readout of mpg is not accurate.
    Before this issue it always read around 45 mpg.
    Now it is reading between 60-80 mpg.
    Driving style/ travel locations have not changed.
    Drivability and fuel level gauge are not affected.

    Searching indicates this is a sensor - in the gas tank?
    Might be covered under the emissions warranty, which, if 8 years, has expired.

    Anyone else experienced this issue?
    Is it a sensor?
    Any tricks, like 12 volt battery disconnect or a strong dose of Techron a cure?
    Accessing the tank can be a burdon, so.......

    All comments appreciated.
     
    #1 Kenny94945, Nov 10, 2025 at 1:04 PM
  2. rjparker

    rjparker Tu Humilde Sirviente

    Joined:
    Jun 6, 2008
    10,040
    6,205
    7
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    First I would make sure the dash was reporting avg mpg, not instantaneous.

    Hardware involved includes the wheel speed sensors which generate speed via the skid ecu inside the brake booster. Generally those inputs would generate codes if bad but anything is possible.

    I would certainly reset things with a 12v power cycle.
     
    #2 rjparker, Nov 10, 2025 at 1:37 PM
  3. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    17,619
    10,384
    90
    Location:
    Western Washington
    Vehicle:
    Other Hybrid
    Model:
    N/A
    I'd need to know more detail before declaring it 'not accurate'. For certain trips under favorable conditions, it is real. Though these conditions generally don't repeat for multiple trips.
     
    #3 fuzzy1, Nov 10, 2025 at 2:42 PM
  4. Kenny94945

    Kenny94945 Active Member

    Joined:
    Mar 24, 2016
    847
    422
    0
    Location:
    Sausalito
    Vehicle:
    2016 Prius v wagon
    Model:
    Four
    1) Reporting the average per trip.
    Did not think necessary, yet I could take a photo of the screen I am refering to.
    2) More info?
    Trips remain the same.
    The screen used to report about 45 mpg at the end of my journey,
    now it is reporting 80 mpg.
    The issue has been occurring for a few months, so I decided to ask our forum.

    Seems 12V battery disconnect is called for as a first gamble.
    Will plug in my generic code reader.
    There are no warning lights lit.
    Will update with findings.
     
    #4 Kenny94945, Nov 10, 2025 at 3:48 PM
(You must log in or sign up to post here.)