BMW i4 M50 Not Starting (2022-2025) & No Dash Lights or Warnings

No start or drive

No warning light on the dashboard

Kombi ECU Failure

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The following fault code(s) may be present

930994 – Safety Battery Terminal: Resistance Too High

S0386 – Communication Not Possible with Instrument Cluster

21F44F – High Voltage Battery Unit (SME): Pyrotechnic Safety Switch Faulty

21F37E – Impact Detection: Crash Detected via ACSM Signal

CE17A5 – No Message: Receiver EME, Transmitter Kombi

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Parts Repaired or Replaced

Kombi ECU
Pyrotechnic safety switch

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Affected Vehicles

BMW i4 eDrive40

BMW i4 eDrive40 2022
BMW i4 eDrive40 2023
BMW i4 eDrive40 2024
BMW i4 eDrive40 2025

BMW i4 M50

BMW i4 M50 2022
BMW i4 M50 2023
BMW i4 M50 2024
BMW i4 M50 2025

BMW iX xDrive40

BMW iX xDrive40 2022
BMW iX xDrive40 2023
BMW iX xDrive40 2024
BMW iX xDrive40 2025

BMW iX xDrive50

BMW iX xDrive50 2022
BMW iX xDrive50 2023
BMW iX xDrive50 2024
BMW iX xDrive50 2025

BMW iX3

BMW iX3 2021
BMW iX3 2022
BMW iX3 2023
BMW iX3 2024
BMW iX3 2025

BMW 5 Series G30 LCI PHEV

BMW 5 Series G30 LCI PHEV 2021
BMW 5 Series G30 LCI PHEV 2022

BMW 5 Series G30 LCI PHEV 2023
BMW 5 Series G30 LCI PHEV 2024
BMW 5 Series G30 LCI PHEV 2025

BMW X5 xDrive45e

BMW X5 xDrive45e 2020
BMW X5 xDrive45e 2021
BMW X5 xDrive45e 2022
BMW X5 xDrive45e 2023
BMW X5 xDrive45e 2024
BMW X5 xDrive45e 2025

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Common Failure Symptoms

No start/no drive
No dash warning lights
Kombi ECU - no display
Fault codes for HV battery/pyrotechnic switch
High resistance at battery terminal
Crash detected by ACSM
No communication between Kombi and other modules
HV battery won’t recommission

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BMW i4 M50 Diagnostic Report

Initially, checks confirmed a no start condition, with no warning lights displayed on the instrument cluster. Subsequently, fault codes indicated a communication loss with the Kombi ECU, as well as faults in the high-voltage battery safety system. Further investigation revealed a faulty Kombi ECU and pyrotechnic safety switch.

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BMW 14 M50 Repairs

First, our expert technicians replaced the faulty Kombi ECU and serviced the high-voltage battery safety components, including the pyrotechnic safety switch. Next, the high-voltage battery was disconnected, recommissioned, and tested. Finally, full system checks confirmed that the repair was successful.

Firstly, Kombi ECU replaced
Then, HV battery safety components (incl. pyrotechnic switch) serviced
Finally, battery disconnected and recommissioned

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Resolution

After full system checks and programming, all faults were cleared, and the vehicle was restored to working condition.

High-voltage system fully operational
Instrument cluster display restored
No start condition resolved

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