2007 Prius Red warning light and check engine lights on

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by szn20011, Aug 26, 2021.

  1. szn20011

    szn20011 New Member

    Joined:
    Aug 26, 2021
    2
    0
    0
    Location:
    atlanta
    Vehicle:
    2007 Prius
    Model:
    N/A
    hello,

    I have 2007 Prius and the red warning light and check engine lights has appeared also the rear ac fan has started to blow air. I have taken out the HYBRID battery and tested each and every cell the battery is all good but the lights are still on. any help?
     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,191
    42,700
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    you need to read the trouble codes. is it hot there? is the battery cooling fan and intake grille clean?

    the modules have to be tested under load
     
    SFO likes this.
  3. szn20011

    szn20011 New Member

    Joined:
    Aug 26, 2021
    2
    0
    0
    Location:
    atlanta
    Vehicle:
    2007 Prius
    Model:
    N/A
    The codes are reading C1241,C1259,C1300,C1310,P0A80,P3018.
    Also yes the cooling fan and intake grill is clean.
     
  4. mr_guy_mann

    mr_guy_mann Active Member

    Joined:
    Sep 3, 2020
    956
    410
    0
    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    Specifically you need to be able to read codes and data from the HV battery ecu. A good option is to get a mini VCI cable (with a bootleg copy of Techsyream - Toyota's diagnostic software) and install it on an old windows laptop. Another option is to get the DrPrius (or Hybrid Assistant app - android only) with a compatible OBD2 bluetooth adapter.
    Then you will be able to see what codes are triggering the warning lights. Also can monitor battery block voltages while the car is driving- during discharge and charge loads. Much more useful than looking at static voltages while it's just sitting there.

    Posted via the PriusChat mobile app.
     
    szn20011 likes this.
  5. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    14,203
    10,046
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Just one notch less specifically, I would start by reading whatever codes are reported by any ECU in the car. Techstream has a "health check" button that makes this easy.

    There may be codes in the battery ECU (probably are, given the fan behavior), but anyway the health check will find out. The ECU making the call to light the warning light is the HV ECU, so it will have one or more codes also (which might only be P3000, meaning to go look at the codes from the battery ECU). With the health check you won't miss any.
     
    szn20011 and JohnPrius3005 like this.
  6. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,191
    42,700
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    what are you reading the codes with?
     
Loading...