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  1. #1
    Learner Driver blitz's Avatar
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    Service vehicle soon fault ?

    Forum Key Rings

    Hi,

    Got Service vehicle soon up on dash plug-in OBD fault finder it came up with DTC U0073 code "Control module communication bus A off" has anyone had this before or what it is?


    Thanks

  2. #2
    Car Enthusiast lizzard-t's Avatar
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    Hello u0073 means one or more of the control modules is not communicating with the ECM .
    Either the can high or can low communication is lost .
    Depending on what kind of scanner you are using you may be able to do a full scan to see which control module is not communicating.
    From there you will have to get a good wiring diagram , to find the can high and low wires .and carry out an ohms test .
    Should be 60 ohms through either can high or low side .
    The can wires are in pairs they normally red and blue , and are twisted together. As they pass through the looms .
    But that's why you require a good wiring diagram .
    Very time consuming and frustrating .

  3. #3
    Learner Driver blitz's Avatar
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    Quote Originally Posted by lizzard-t View Post
    Hello u0073 means one or more of the control modules is not communicating with the ECM .
    Either the can high or can low communication is lost .
    Depending on what kind of scanner you are using you may be able to do a full scan to see which control module is not communicating.
    From there you will have to get a good wiring diagram , to find the can high and low wires .and carry out an ohms test .
    Should be 60 ohms through either can high or low side .
    The can wires are in pairs they normally red and blue , and are twisted together. As they pass through the looms .
    But that's why you require a good wiring diagram .
    Very time consuming and frustrating .

    Thanks for the reply I think it the code reader I got not communicating with car its an obd2 it clears the "service vehicle soon" but after a while, it pops back up on dash been looking at the opcom reader but can't find any that will work for a 2015 model insignia seem that they will only cover up to 2014 not sure what other scanners that will work

  4. #4
    Car Enthusiast lizzard-t's Avatar
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    Vaux com

  5. #5
    Learner Driver blitz's Avatar
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    Just an update got a opcom that worked fault was Glow plug cylinder 3 changed it and all sorted,

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