Depress brake

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Karm, Aug 10, 2026.

  1. Aug 10, 2026 #1
    Karm

    Karm Bobtail Member

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    Aug 10, 2026
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    2024 Freightliner New Cascadia (DD15 / DT12). New Clutch & CPCA installed. Keeps throwing SPN 521007 FMI 14 (Main Shaft Speed Sensor DzHaw signal implausible) and 'Depress Brake / May Not Shift' after driving 30–120 miles. Replaced Brake Drag Switch, Jumper Harness, Brake Pedal Assembly, 2V Valve, and WABCO Air Valve. Static relearn passes at Freightliner. They replaced clutch and actuator cause bad clutch. Please help
     

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    Karm, Aug 10, 2026
    Karm, Aug 10, 2026
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  3. Aug 10, 2026 #2
    JB7

    JB7 Road Train Member

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    Detroit Diesel Service Bulletin 06 02-16: SPN 521007 (TCM) Troubles…
    This is a service bulletin for the exact code you have. Did anyone even check for bulletins etc.?
     
    JB7, Aug 10, 2026
    JB7, Aug 10, 2026
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    Magoo1968 Thanks this.
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