Freightliner cascadia not going into gear

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by truckerbangin, Sep 23, 2025 at 7:11 PM.

Sep 23, 2025 at 7:11 PM #1

truckerbangin Light Load Member

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Jan 22, 2013

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Have a 2020 cascadia with dt12 transmission. Noticed clutch had a slip and was recommended to do a clutch and transmission relearn procedure to adjust the clutch. Truck won’t go into gear after a clutch and transmission relearn procedure. Procedure went successful but now truck won’t shift out of neutral. If I shift to drive stays in neutral or if I select reverse it stays in neutral but changes transmission mode to manual. It’s has a code spn 521001 Fmi 14 automatic mode not available - gear shift not plausible.

truckerbangin, Sep 23, 2025 at 7:11 PM

truckerbangin, Sep 23, 2025 at 7:11 PM

#1
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