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Service vehicle soon fault ?

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  • Service vehicle soon fault ?


    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
    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 .

    J.K.M.P.C.U

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    • #3
      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

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      • #4
        Vaux com

        J.K.M.P.C.U

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        • #5
          Just an update got a opcom that worked fault was Glow plug cylinder 3 changed it and all sorted,

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