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u0155 lost communication with instrument panel cluster 2011 prius

Discussion in 'Gen 3 Prius Main Forum' started by PriusKyle, Mar 26, 2024.

  1. PriusKyle

    PriusKyle Junior Member

    Joined:
    Mar 12, 2022
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    Vehicle:
    2011 Prius
    Model:
    Three
    Hi all,

    Saw this code and from the little info I got, the instrument cluster is failing to communicate; that’s all I know.
    All the basic display on instrument panel looks and works normally, but i’ve never experienced any warning icons, i.e., check engine light etc except the TPMS icon and this is the case as the four sensors have expired and i’ve not replaced them.
    Shouldn’t i see issues with my instrument display if I have this error code?
    Thanks!
     
    #1 PriusKyle, Mar 26, 2024
  2. ChapmanF

    ChapmanF Senior Member

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    Mar 30, 2008
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    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    A U0155 code is like a message in a bottle that says "hey, I can't talk with the combination meter."

    To complete the picture, you'll want to know who sent that message—which of the other ECUs in the car. The power management control ECU, the body ECU, the certification ECU (smartkey), and the climate control all like to talk with the combination meter, and they all will say "U0155" if they can't.

    So once you know which one is saying it can't talk with the combination meter, you can have a much better idea where the problem is, and work through the network diagrams and troubleshooting steps under "multiplex communication" and "CAN communication system" in the repair manual.

    Toyota Service Information and Where To Find It | PriusChat

    Some scan tools are helpful and show you the trouble codes grouped by which ECU sent them. Some scan tools aren't that helpful, and just show you all the codes they heard no matter from where; that makes things harder.
     
    #2 ChapmanF, Mar 26, 2024
    PriusKyle likes this.
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