Check PCS system / Check Hybrid System message

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by Vulcanman, Apr 11, 2015.

  1. Vulcanman

    Vulcanman Junior Member

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    I have a 2012 Prius Plug-In (Advanced) with 38K miles.

    This morning (outside temp: 75C) we were driving on the interstate at 60mph with Cruise Control enabled. It was not in EV mode (we had forgotten to charge it last night).

    About 5 miles into the drive the cruise control turned off and it displayed a Check PCS system and a Check Hybrid System. error message.

    Other than the constant error messages and the cruise control being automatically disabled, the car was running fine. I exited the highway and ended up at a stop light for a couple of minutes. This is where the car typically shuts off the engine and goes into battery mode. Well, when I got Green signal ... I tried to move and the car was extremely sluggish. I put on the hazard lights and pulled into a parking lot and turned off the engine. Turned it back on after a couple of minutes ... kept in on and in Park ... about five minutes later the gas engine kicked in and I was able to move fine. I quickly turned around and took the interstate to head back home. It drove fine on the interstate (gas engine was on all the time). Took the exit to head home and same problem - the gas engine shut down and the thing became sluggish (could not drive faster than 10-15 mph). About two minutes into that the gas engine slowly kicked in and I was able to get back to decent speed to get home.

    I also noticed that the dash display that typically shows the animated arrows between engine / battery etc ... it was not showing any arrows - like there was no communication between the engine and battery.

    Now here I am trying to figure out what happened - any clues.
     
  2. Easy Rider 2

    Easy Rider 2 Senior Member

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    Something broke (stopped working) for some reason that really isn't important at this point because it isn't anything that you did.

    Since the problem rather obviously is with the hybrid propulsion system it still should be under warranty.

    Have it towed in and fixed.

    P.S. You ride a Vulcan ?? Mine's a 900 C.
     
  3. rxlawdude

    rxlawdude Active Member

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    I thought this was in reference to the OP reporting ambient temperature of 75 Celsius. :)
     
  4. bisco

    bisco cookie crumbler

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    i thought it was the mind meld.seriously though, where was the battery level reading?pcs, is that the inverter diode recall?
     
    #4 bisco, Apr 11, 2015
    Last edited by a moderator: Apr 11, 2015
  5. Vulcanman

    Vulcanman Junior Member

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    The battery level (hidden diagnostic menu) is at 12.1V. PCS is Pre-Collision alert System Also, since I did manage to get back home, I charged the car and put in drive mode - the animated display does show that the battery is the sending juice to the drive train.
     
  6. bisco

    bisco cookie crumbler

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    you need a new 12 volt. it should be at least 12.5 when at rest.
     
  7. Tideland Prius

    Tideland Prius Moderator of the North
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    Also note that if it fails the routine start up check (I'm sure the long list of parameters are listed in the repair manual), it'll also display the Check PCS error.
     
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  8. Vulcanman

    Vulcanman Junior Member

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    Are you sure - why would the 12V battery - turn off the cruise control while driving at high speeds (gasoline engine mode) on the interstate.

    Also - On the Plug-In what is the easiest way to get into diagnostic mode - I did manage to get it - but that was after trying 3 or 4 different methods - and now I forget which method actually clicked. LOL.Also - I see vents on the right side rear passenger seating ( its at elbow level ) - is that the vent for the battery fan? If not, can someone point out where it is?
     
    #8 Vulcanman, Apr 11, 2015
    Last edited by a moderator: Apr 12, 2015
  9. sfv41901

    sfv41901 Masta S

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    Yes, that's the inlet vent for the traction battery.

    Have u been able to pull any DTCs
     
    #9 sfv41901, Apr 11, 2015
    Last edited: Apr 12, 2015
  10. Vulcanman

    Vulcanman Junior Member

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    No yet - also, I read somewhere that hybid system codes require a more expensive gadget than the one we owners typically invest in.
     
  11. bisco

    bisco cookie crumbler

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    yes, you need a toyota capable reader, or take it to the dealership.

    the 12 volt can make the car do all sorts of funky things, because it runs the computers, and they don't like voltage fluctuations. it's the easiest thing you can check on the car, besides the oil level. sorry, i don't know how to get into diagnostic mode, but i check the 12 volt with a digital volt meter, in the fuse box under the hood.i'm not saying it's the problem, but with the reading you got, it's worth a check. it's possible you just need a charge.
     
    #11 bisco, Apr 12, 2015
    Last edited by a moderator: Apr 12, 2015
  12. Easy Rider 2

    Easy Rider 2 Senior Member

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    It is just a possibility, not absolutely certain.
    The 12 V system runs ALL of the computers in the car and they make EVERYTHING happen.
    If the 12 V goes haywire, it can make all KINDS of strange things happen.
     
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