U0111 with both subcodes - which ECU?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by wannafly34, Dec 17, 2019.

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  1. wannafly34

    wannafly34 Junior Member

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    So a couple of times our 2007 Prius with 222K had an issue where the TOD came on and system lost power, running on engine only. Took about 30 seconds to go from 0-45MPH. Pulled over, sat for a minute and lights came on but hybrid system started charging the battery again.
    This past weekend - wife and daughter took the car to Augusta with no issues whatsoever. Yesterday driving around same issue came up and would not fix, regardless of how long it sat or disconnecting and reconnecting the 12v battery.

    Pertinent details:
    222K miles
    Replaced hybrid battery 2 ish years ago by Green Bean
    Replaced 12v around the same time (Voltage 12.5 when nothing running, 14.2 when running)
    Codes are u0111-208 and u0111-531 read with TechStream

    Any ideas???
     
  2. wannafly34

    wannafly34 Junior Member

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    Update - had 12v battery tested - perfectly healthy.
    Called Green Bean - informed there would be other codes in addition to U0111 if the battery ECU were failing.
     
  3. wannafly34

    wannafly34 Junior Member

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    Also did the Combination meter repair a year or two ago.
     
  4. dolj

    dolj Senior Member

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    DTC | U0111-208 | Lost Communication with Battery Energy Control Module "A"
    DTC | U0111-531 | Lost Communication with Battery Energy Control Module "A"

    DESCRIPTION


    The HV control ECU transmits and receives signals to and from the ECM, battery ECU, skid control ECU, power steering ECU, and the gateway ECU via CAN (Controller Area Network) communication.

    DTC No. INF Code DTC Detection Condition Trouble Area
    1 U0111 208 CAN communication problem between battery ECU and HV control ECU (no signal input) • CAN communication system
    2 U0111 531 CAN communication problem between battery ECU and HV control ECU (CAN communication system malfunction) • CAN communication system

    MONITOR DESCRIPTION

    If the HV control ECU detects a malfunction in the CAN communication with the ECM or battery ECU, it illuminates the MIL and sets a DTC.

    U0111:
    1 Related DTCs
    • U0111 (INF 208): Receiving check for the specific frame
    • U0111 (INF 531): Receiving check for the all frame
    2 Required sensor / components
    • Main: Battery ECU
    • Sub: CAN bus line
    3 Frequency of operation Continuous
    4 Duration
    • U0111 (INF 208): 0.1 second or more
    • U0111 (INF 531): 1.6 seconds or more
    5 MIL operation 1 driving cycle
    6 Sequence of operation None


    The codes suggest a problem with the CAN (Car Area Network) rather than a specific ECU.
     
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  5. wannafly34

    wannafly34 Junior Member

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    Thanks for the info. Guess the question now is how much digging I can/want to do into the CAN Bus or whether it might be time to let her go...
     
  6. wannafly34

    wannafly34 Junior Member

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    To add - also have C1259 and C1310 which still points to the CAN I believe. The Hybrid controller and the Hybrid battery just don't want to talk...so sad at the holidays when folks don't talk to one another LOL
     
  7. dolj

    dolj Senior Member

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    C1259 is the EBC ECU acknowledging that it has been told there is a HV System Regenerative Malfunction
    C1310 is the VSC ECU acknowledging that it has been told there is a Malfunction in HV system.

    If the various ECU's can't talk to each other because of the CAN communication problem, they go into a fail-safe condition.

    Check the connector on the ECU in the HV battery (is that the HV battery ECU??) for corrosion or damage to the pins.
     
  8. wannafly34

    wannafly34 Junior Member

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    Will do thanks again for the input it’s much appreciated!
     
  9. wannafly34

    wannafly34 Junior Member

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    Yeah I think I give up. Happy New Year lol! Have been through the car 3 times. No corrosion or damage to the pins on any of the 3 connectors to the ECU. Canbus wires have continuity all the way back to the HV battery. Techstream sees all the ECUs except for the Hybrid battery. Car still starts and runs but engine comes on immedately after the 3 clicks from the battery, but surges and acts like it wants to move forward even in park until the engine warms up. Idle stays fairly high. It only shows that U0111 code with the 2 subcodes and the two C codes under the ABS/TRAC/VSC system. Might be time to start singing the "Frozen" song...
     
  10. ChapmanF

    ChapmanF Senior Member

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    But think how many places you've been with this one. If Techstream sees everything but the battery ECU, and you haven't found any wiring issues, maybe try a battery ECU? Might be possible to get for cheap. (Requires personal protective gear for high voltage when replacing, though.) Then you can be back on the road with the car you've been with all this time.

    Otherwise, it's into the unknown.
     
  11. wannafly34

    wannafly34 Junior Member

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    Hahaha! Nice play with the Frozen 2 song LOL :)
     
  12. wannafly34

    wannafly34 Junior Member

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    Fixed! Replaced the battery ECU with a used unit and it is working fine!
     
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  13. wannafly34

    wannafly34 Junior Member

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    Thanks for all the help and advice!
     
  14. ChapmanF

    ChapmanF Senior Member

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    Ah! Glad all is found.
     
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