Fixing BMW dead battery

    Jan. 30, 2024
    This bulletin applies to BMW G-series vehicles that experience total battery discharge.
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    Photo courtesy of BMW
    The cause may be software errors in the electronic gearbox control (EGS). The fix: re-program the EGS using ISTA 4.39.2x or higher.
    The cause may be software errors in the electronic gearbox control (EGS). The fix: re-program the EGS using ISTA 4.39.2x or higher.

    This bulletin applies to BMW G-series (G01, G02, G12, G30, G32,G05, G06, G07, G22, G23, G26, G42) vehicles that experience total battery discharge. Due to a software error, the vehicle may sporadically not achieve sleep mode.

    \As a result, the 12-volt battery becomes discharged and may cause a no-start condition. Fault code 80402F (power management, battery condition: Total discharge) is stored in the BDC (body domain controller). The cause may be software errors in the electronic gearbox control (EGS). The fix: re-program the EGS using ISTA 4.39.2x or higher.

    About the Author

    Motor Age Staff

    Motor Age has been publishing technical content for professional automotive technicians since 1899. Our writers have decades of experience and scores of ASE certifications, and they continue to teach new generations of technicians via classrooms all around the globe, as well as through the books and training manuals they've authored. 

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