Engine
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    truck

    Why Won't My Diesel Truck Start?

    Typical repair cost: $0–$4,500

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    Common Symptoms

    No crank
    Cranks but won't fire
    White smoke during crank
    Glow plug warning
    Long crank in cold weather

    Most Likely Causes

    1

    Weak batteries

    Diesels need both batteries strong — one weak battery prevents cranking on 24V systems.

    2

    Failed glow plugs / grid heater

    Cold-start failure below 40°F — extended crank then fires with white smoke.

    3

    Air in fuel system

    Common after fuel filter change — needs priming.

    4

    Failed HPFP or rail pressure sensor

    Codes P0087/P0088 — no rail pressure = no fire.

    5

    Failed CKP/CMP sensor

    No crank signal = no injection event.

    How a Shop Diagnoses It

    1. 1.Load-test both batteries individually.
    2. 2.Scan for fuel pressure during crank (should hit 5,000+ PSI on common-rail).
    3. 3.Check glow-plug current draw.
    4. 4.Verify fuel filter is primed and water-separator drained.

    When to see a professional

    Don't crank repeatedly without rail pressure — you'll damage the starter and HPFP.

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