456 Speedometer issue | FerrariChat

456 Speedometer issue

Discussion in '456/550/575' started by PalmerWinchmore, Jul 13, 2025.

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  1. PalmerWinchmore

    PalmerWinchmore Rookie

    Joined:
    May 18, 2025
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    Location:
    London (UK)
    Full Name:
    Antonis Georgiou
    Firstly a big thank you to this forum for being such a resource for myself as I finally bought my first Ferrari. Recently took ownership of a 1995 456 GT in Azzurro blue.
    Sadly today the speedometer stopped working and wondering if there is any advice I could try before a trip to the garage.
    Thanks
     
    PalmerWinchmore, Jul 13, 2025
    #1
  2. Ferrari55whoa

    Ferrari55whoa F1 Rookie Owner Rossa Subscribed

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    Eric
    Does the front abs assembly sending unit on the 456 send the ecu the info for the Speedo?

    where in the world are you located? Sig block is empty
     
    Ferrari55whoa, Jul 13, 2025
    #2
    Qavion likes this.
  3. Qavion

    Qavion F1 World Champ Silver Subscribed

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    Ian Riddell
    If it's like the 456M, it's from one of the rear sensors (via the ABS unit).

    But on the M car, the WSM has conflicting information. The speed either comes from the left rear or right rear wheel speed sensor.

    Clean both sensors? Or clean one and test.

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    Last edited: Jul 13, 2025
    Qavion, Jul 13, 2025
    #3
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  4. PalmerWinchmore

    PalmerWinchmore Rookie

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    Location:
    London (UK)
    Full Name:
    Antonis Georgiou
    Appreciate the advise, will try cleaning the sensors and see what happens.
    Also update details (based in London)
     
    PalmerWinchmore, Jul 13, 2025
    #4
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