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C1310-156, U0073, U0123, U0124, U0126, U0293

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Dvizzy, Mar 9, 2018.

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  1. Dvizzy

    Dvizzy Junior Member

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    Hi Everyone,

    Car is getting codes above. Have to reset the 12V battery to get car to start after shutting car off. Will drive with triangle of death and no check engine light. I checked HV battery and after load testing the batteries check out.

    Any help is appreciated!
     
  2. dolj

    dolj Senior Member

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    The C1310-156 code is set by the Hybrid control system (Enhanced VSC, TRAC system).

    The traction control prohibition signal is received for at least 0.07 sec. when IG2 terminal voltage is 10.5 V or more for at least 1.5 sec. and communication with hybrid control ECU is valid.

    It would appear that this DTC is set when there is a CAN bus communications problem that prevents the Hybrid Control ECU communicating with the Skid Control ECU. The service manual directs that you need to check the hybrid control system.

    The Uxxxx codes mean there is a problem with the communications network.

    Have you checked the 12 V battery and ensured you have a good and healthy 12 V supply?
     
    #2 dolj, Mar 9, 2018
    Last edited: Mar 9, 2018
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  3. edthefox5

    edthefox5 Senior Member

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    Yes check the 12 volt voltage at the front jump points with car off with voltmeter.
    Then with car off turn on the headlights on high beam and check voltage at the jumps again.
    With headlights on should not be more than a .5 volt drop.

    Your describing a hi volt ground fault which can be cleared by bouncing the 12 volt. Usually from leaking electrolyte in the hybrid battery. When u were in the hybrid battery how corroded was everything?

    Do you have pictures of the battery?
     
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  4. Dvizzy

    Dvizzy Junior Member

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    THe 12 V battery at the front is 12.51V. The voltage after putting the car in IG ready is 11.78V. I didn't check how corroded the bus bars were. I would get the P0A80 code if it was the hybrid battery wouldn't I?

    I thought it would be the Skid Control ECU since I'm not getting a reading (U0073, U0123, U0124, U0126, U0293)
    from those sensors given the codes. I changed the Skid Control ECU.

    upload_2018-3-10_19-24-52.png

    After installing a used Skid Control ECU, now I get C1300-1061. I am also getting C1241 as well as C1259 in addition to the original codes. To top it off I am now getting P0AA6-526. Hope this helps someone whos loves solving puzzles help me get this right.

    Much appreciated!
     
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  5. Patrick Wong

    Patrick Wong DIY Enthusiast

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    I would say that the main issue your car has is a high voltage ground fault. That is the significance of DTC P0AA6.

    As a safety measure the car cannot be started after the fault is logged. However as you learned, a workaround is to disconnect the 12V battery which causes that DTC to be cleared. Then the car can be started once. Since the fault persists, the DTC is logged again, and the car cannot be started until the 12V battery is disconnected once more.

    The ground fault may be due to a fault anywhere in the hybrid drivetrain where high voltage is present. Likely faults include leaking electrolyte from a traction battery module, a fault in the traction battery ECU, or a stator winding insulation fault within the transaxle.

    It is not clear that the replacement skid control ECU is helping since you now have DTC C1300 which indicates a failed ECU. Or maybe you damaged the associated wiring harness connector.

    Further, you need to fully-charge the 12V battery. That is the meaning of DTC C1241.
     
    #5 Patrick Wong, Mar 11, 2018
    Last edited: Mar 11, 2018
  6. Dvizzy

    Dvizzy Junior Member

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    Thanks, Patrick!

    Do you think this test below (from luscious garage) will isolate what part of the hybrid drivetrain is faulting?
     
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  7. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    That test is effective if the leak is bad enough to quickly trip the code. Give it a try.
     
  8. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    Congratulations and respect for being able to get that top mounting nut off. Did you bother putting it back on?
     
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  9. Dvizzy

    Dvizzy Junior Member

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    IMG_0657.JPG image_123923953.JPG BOTTOM.JPG

    Patrick,
    I've never encountered this issue before so I will take the leaky batteries out if I can identify them and replace them with other ones. Anyone else have other thoughts?

    The Skid Control ECU had to me taking the dash up and out to get to the top bolt. I have to get that fixed.

    Here's the damage ... How can this cause a ground fault?
     
    #9 Dvizzy, Mar 11, 2018
    Last edited: Mar 11, 2018
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  10. Dvizzy

    Dvizzy Junior Member

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    Here's the damage ... How can this cause a ground fault?
    IMG_0663.JPG IMG_0662.JPG
     
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  11. Patrick Wong

    Patrick Wong DIY Enthusiast

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    The traction battery is isolated from body ground. Neither the positive nor negative leads from the battery should be connected to body ground. This is required for safety reasons.

    In your pictures, substantial corrosion on the traction battery case is evident. This came from electrolyte leaking from one or more modules. The electrolyte is clear and not easy to see; however if a module has corrosion on a terminal that is good evidence that the module is leaking.

    The electrolyte leaking to the battery case sheet metal causes an electrical path to body ground, hence a ground fault results.
     
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  12. Dvizzy

    Dvizzy Junior Member

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    Changed out some of the batteries with the most evident leaks. Closed her back up and all faults went away. Car is happy again.

    I appreciate everyone's help!
     
  13. dolj

    dolj Senior Member

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    Did you clean the case to remove all traces of electrolyte from the case and all the modules? If you didn't you will be back in there as soon as it gets damp.
     
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  14. Celeste1316

    Celeste1316 New Member

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    How does one clean the case?

    So I'm getting the POA80 and UOO73 error codes. I'm trying to figure out what exactly is wrong with my Prius. When the slip indicator pops up with check engine and triangle and (!) Then slip and (!) Disappear shortly after . My ecu and pwr and eco mode stop working as well as the energy monitor when these codes pop up. Any idea?
     
    #14 Celeste1316, Jun 12, 2020
    Last edited by a moderator: Jun 12, 2020
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  15. Dxta

    Dxta Senior Member

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    Replace the HV battery if you can.
     
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  16. 44Zoomer

    44Zoomer Junior Member

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    Thank you for posting the fix. This has helped me fix mine
     
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