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horibajim's avatar
horibajim
Explorer
May 29, 2014

Cummins ISB engine fault

Winnebago 2005 Journey 36G
Freightliner Chassis
Cummins 5.9 liter engine

Driving north on I75 at the Georgia border. All of a sudden the cruise control quit, all of the dash gauges went to zero. Allison transmission readout went to "DD" instead of "D5" which was normal. Two messages alternated on the dash readout.

No Comm. with Engine ECU
No Comm. with Trans ECU

Anyone have any ideas?
Class A

4 Replies

  • gsf35099's avatar
    gsf35099
    Explorer
    May 29, 2014
    horibajim wrote:
    Winnebago 2005 Journey 36G
    Freightliner Chassis
    Cummins 5.9 liter engine

    Driving north on I75 at the Georgia border. All of a sudden the cruise control quit, all of the dash gauges went to zero. Allison transmission readout went to "DD" instead of "D5" which was normal. Two messages alternated on the dash readout.

    No Comm. with Engine ECU
    No Comm. with Trans ECU

    Anyone have any ideas?


    I had a very similar problem and it was a bad connector in between my BCC (battery control center) compartment below the driver in front of the tire and the dash. There was another that had this problem and he said he found his wire harness had come loose from the frame causing the connector to unplug.
  • wolfe10's avatar
    wolfe10
    Explorer
    May 29, 2014
    Ignition switch or more likely the ignition solenoid that it controls.

    Easy to diagnose: turn on the key. Does anything that only works with the ignition on still work-- dash fan is an easy one to check.

    If nothing works that works off the ignition, there is an emergency work around and also pretty easy to determine if solenoid or wiring/switch.
  • Tom_Barb's avatar
    Tom_Barb
    Explorer
    May 29, 2014
    horibajim wrote:
    Winnebago 2005 Journey 36G
    Freightliner Chassis
    Cummins 5.9 liter engine

    Driving north on I75 at the Georgia border. All of a sudden the cruise control quit, all of the dash gauges went to zero. Allison transmission readout went to "DD" instead of "D5" which was normal. Two messages alternated on the dash readout.

    No Comm. with Engine ECU
    No Comm. with Trans ECU

    Anyone have any ideas?


    ECU lost ground.. clean the back side attachment points and the engine block mount pads.

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