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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Weird MHD code can’t figure out



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      07-10-2019, 11:43 PM   #1
warrenh555
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Weird MHD code can’t figure out

I recently had the code 3876 power management central undervoltage come up on MHD. When I start the car up the dash light up and shows DSC Malfunction but when I drive it goes away than comes back again. My buddy says maybe speed sensors, maybe alternator, battery? I’m confused and can’t find anything. Thanks for your help

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      07-18-2019, 06:01 AM   #2
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IMO i strongly believe you have a weak/drained battery. The diagnosis monitors the vehicle voltage (measured at the DME/DDE) with the engine running. The fault is detected when the vehicle voltage drops below 9V for longer than 60 seconds. Change the battery, Reset adaptations..Good luck sir
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