Detroit Diesel
    DDEC flash code

    Detroit Flash Code 73: ESS Transmission Stuck in Gear

    73 on Detroit Diesel engines means: ESS Transmission Stuck in Gear. The failure mode (FMI 14) is “special instructions”.

    Code details

    Manufacturer
    Detroit Diesel
    Applies to
    Detroit Diesel Series 60 EGR (DDEC IV)
    Fault code
    73
    FMI
    14 — Special instructions
    J1587 PID / SID
    SID 151

    What to do next

    • Read active and inactive codes with the OEM service tool (Detroit Diesel Diagnostic Link) and note the occurrence count.
    • FMI 14 tells the shop the type of failure to test for: special instructions.
    • Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.

    Get this code diagnosed

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    Related fault codes

    Source: Detroit Diesel Series 60 EGR Technician's Guide, DDEC IV EGR fault code table (Table 4-1). See also OBD-II codes.