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Ford Fiesta Mk7 AT Erratic Gear Shifting. HS-CAN Error.

AuroraBlueFiesta01
AuroraBlueFiesta01
in Ford Fiesta Club

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Hello everyone.

I was driving at a highway when I noticed that the was shifting at the wrong RPM. As I got home. I plug in the OBD2 scanner (Forscan) to check for fault codes. All modules connected to HS-CAN bus network are having errors. Modules connected at the MS-CAN bus network are ok. 

What could be the cause of this issue?

  • Quote


    Check all the wiring from the Gearbox to the TCM and the TCM to the PCM for continuity problems.

    It sounds like you have a broken/corroded COMMs wire somewhere

  • Quote
    • Like 1

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