P0560 troubleshooting

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by DanHoug, Feb 25, 2026 at 6:10 PM.

  1. DanHoug

    DanHoug Junior Member

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    working on a 2007 Prius, has a current issue of P0560. new 12v True Start battery, live data returns voltage of 13.7 in the ENGINE/ECT section. code come back immediately after clearing. car operates fine, no red triangle.

    i've gone thru the Diagnostics 05-895 section and the resistance tests between the HEV fuse holder and the battery ECM connector B11-1 are well under 1 ohm. isolation of fuse holder to body around 15 meg ohm. i've changed battery ECMs to no difference. also have tried different Engine Control and HV ECMs. i'm stumped.

    one thing, and tell me if this is significant, is that i have the Engine and HV ECMs out and hanging by their plugs, not bolted into the chassis. i do have a ground jumper between the ECMs and the body but it isn't like being bolted in.

    -dan
     
    #1 DanHoug, Feb 25, 2026 at 6:10 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    Seems to me I'd be looking at my inverter converter section of the inverter the part on bottom that charges 12V. You're on the lowest edge of charging 12V at 13.5 or so . And with short trips etc that could equal low charging . Or emulation of that low charging . Seems like.
     
    #2 Tombukt2, Feb 25, 2026 at 8:32 PM
  3. DanHoug

    DanHoug Junior Member

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    what would normal ECM voltages be? i'd replaced the inverter with one out of a 2005 while troubleshooting different problems so i could swap the 07 one back in. haven't got the wiper area put back together yet.
     
    #3 DanHoug, Feb 25, 2026 at 8:37 PM
  4. ChapmanF

    ChapmanF Senior Member

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    Can you post the "05-895" section that you're referring to? I've found diagnostic steps for P0560 in a 2004 edition floating around, but they're on page 05-264 through 05-267. Of course page numbers can be different between editions, but what's more puzzling is these steps don't really suggest looking at the stuff you've been looking at. They're more about the voltage arriving at pin 6 (BATT) of the ECM.

    A bit about naming, there's only one ECU in the car that has the alternate name "ECM" (engine control module). The rest are just called the whatever ECU (electronic control unit, the generic term).
     
    #4 ChapmanF, Feb 25, 2026 at 8:55 PM
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  5. DanHoug

    DanHoug Junior Member

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    i'll post it up tomorrow. i see the "05-895" was for a 2004. also found the similar section in a 2008 manual but had different numbers. anyway, i'll post it up.

    thanks for the nomenclature lesson... it's important to be correct when troubleshooting. this has been the Prius From Hell. given to me by a friend after the dealer couldn't fix the dying-while-driving issue after having it two weeks. i pulled the rear interior out and there was water everywhere from the roof seam leaks. anyway, very very long story short, i'm at the point where it runs without issue and the only code is P0560. gotta find that problem before putting the dash back together, IF i can remember how to do that. it's been apart nearly a year.
     
    #5 DanHoug, Feb 25, 2026 at 9:11 PM
  6. dolj

    dolj Senior Member

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    I'm sure you probably thought it goes without saying, but you don't say whether you did the very first step, and if you did you didn't say what the result was.

    (a) Remove the HEV fuse from the engine room relay block.
    (b) Measure the resistance of the HEV fuse.
    --> Standard resistance: Below 1 Ω
    (c) Reinstall the HEV fuse.

    Note you should measure the resistance, not just visually inspect it
     
    #6 dolj, Feb 25, 2026 at 11:06 PM
    Last edited: Feb 26, 2026 at 12:08 AM
  7. Tombukt2

    Tombukt2 Senior Member

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    He said it was well below the one ohm I do believe in first post or something measured under 1 ohm
     
    #7 Tombukt2, Feb 25, 2026 at 11:16 PM
  8. dolj

    dolj Senior Member

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    He said he tested the wire between the HEV fuse holder and the battery ECM connector B11-1 and that was well under 1 Ω. He didn't mention testing the fuse that was in the HEV fuse holder.
     
    #8 dolj, Feb 26, 2026 at 12:05 AM
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