Prius ICE will not start

Discussion in 'Gen 2 Prius Main Forum' started by brownsnoutuk, Apr 23, 2013.

  1. brownsnoutuk

    brownsnoutuk Active Member

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    Driving home today, my prius threw the triangle and all the other warning lights. Scanned with my scan gauge got code u0100. I was only a mile from home so attempted to drive it. Car made it 1/4 mile and then died. I had it towed to the house and checked the grounding wires going to the engine and transaxle. The Tranaxle grounding wire was loose so i pushed it together tightly. The car now runs on main battery only, the ICE does not fire up. All warning lights are still present. Nav screen says problem. 12v is good.

    Any ideas?

    511,000 miles btw..
     
  2. Kermitt

    Kermitt Junior Member

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    511k miles??? Oh wow!!!!!
     
  3. 2k1Toaster

    2k1Toaster Brand New Prius Batteries

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    511,000 miles?! Is that a typo? Otherwise congrats!
    When you ran the car for another 1/4mile, you could have exhausted the traction battery to the point where MG1 cannot spin the ICE. Do you hear anything after you start the car? Does the engine sound like it is trying to turn over, but doesn't? Are you sure you have fuel?
     
  4. brownsnoutuk

    brownsnoutuk Active Member

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    i have fuel and the main battery is showing 1/2 charge. I have found that the engine will run if i hold down start as opposed to pressing it. The engine will then run for 10-20 seconds before shuddering and stalling,

    511k is correct.
     
  5. 2k1Toaster

    2k1Toaster Brand New Prius Batteries

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    The best thing to do now is to get the codes pulled since the lights are on. Anyone can guess, but the car will have a good hunch.
     
  6. brownsnoutuk

    brownsnoutuk Active Member

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    u0100 is the only code
    U0100:Lost Communication With ECM/PCM "A"
     
  7. 2k1Toaster

    2k1Toaster Brand New Prius Batteries

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    If the Engine Control Module cannot be communicated with, then the engine won't start. That seems like a pretty coincidental self diagnosis, so hopefully that's it.

    Have you checked the connectors on the ECM just to make sure they haven't wiggled loose?
     
  8. Abdullah Jordan

    Abdullah Jordan Junior Member

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    511K ?! you the best man , i never seen any millage like this on prius !! , is it 2004 model ?
     
  9. brownsnoutuk

    brownsnoutuk Active Member

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    2005 model, all connections seem tight.
     
  10. SteveLee

    SteveLee Active Member

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    Negative lead from the 12V battery to it's ground, good connection?
     
  11. nh7o

    nh7o Off grid since 1980

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    You might just try finding a used Engine Control Module, and swapping it in. Maybe autobeyours.com has one, if not a local yard.
     
  12. brownsnoutuk

    brownsnoutuk Active Member

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    yes i cleaned the post and grounding point.
     
  13. brownsnoutuk

    brownsnoutuk Active Member

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    Im going to take it to toyota in the morning and see if they can tell me exactly whats causing it. Would hate to throw money at it and miss.
     
  14. bisco

    bisco cookie crumbler

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    is this the first problem you've had in 511,000 miles? do you think they'll warranty it?
     
  15. brownsnoutuk

    brownsnoutuk Active Member

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    warranty it... not a chance. Try to sell me a new hv ecu to the tune of $1800, yep.

    Following codes were present.

    p3000, u0100, c1310 and p1121.

    Toyota advised changing the HV ECU (P3000) for $1800, and the coolant flow control valve (p1121) for around $400.(i didnt write the exact prices down)

    I bought the coolant control valve for $70 and installed tonight. About an hour to install, took it for a test drive around 5 miles, no more check engine light. Will have to drive it around tomorrow to know for sure but fingers crossed that was the main problem.

    Thanks for the suggestions.
     
  16. nh7o

    nh7o Off grid since 1980

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    One of the options for P3000 is "HV battery cooling system malfunction". With that kind of mileage, I can guarantee you that your battery cooling fan is in need of cleaning. It is easy to do, and is something that the stealerships don't seem to recognize very often. Many posts here about it, with gruesome photos.

    Don't go for the $1800 replacement unless you get further info. Please post the freeze frame info here if you can get it from the service dept. The U0100 does make it look like there is some problem with the network communication from the Battery Control Module. If there is overheating going on, that module may be having problems. A used unit from a salvage yard might be cheaper.
     
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