ddec 2 code 54 speed sensor

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by irneet, Jul 14, 2020.

  1. irneet

    irneet Bobtail Member

    Jun 18, 2014
    have a ddec 2 that keeps throwing up code 54 and then derates power. tried changing the vss still no luck.
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