BMW electronic battery isolator switch fault codes
The 18 fault codes the electronic battery isolator switch can store, and what each one means. Some codes mean different things in different versions of the module; tap a code to see which applies to your car.
On: 8 Series (E31), 7 Series (E38)
- 0000 internal error: internal voltage
- 0001 internal error: charge pump not switchable off
- 0002 External error: Terminal 15 short circuit
- 0003 External error: engine speed signal at input TD missing
- 0004 External error: E_KAT_EIN ground short
- 0005 External error: overvoltage starter battery
- 0010 internal error: processor watchdog
- 0011 internal error: processor ROM
- 0012 internal error: clock generator
- 0013 internal error: temperature monitoring defective
- 0014 internal error: EEPROM
- 0015 internal error: calibration data missing
- 0016 internal error: coding data missing
- 0017 External error: generator voltage too low
- 0018 External error: ZSK short circuit
- 0019 External error: onboard battery support during starting operation
- 001B External error: batteries or module disconnected
- 001C External error: K-bus or combination signal missing
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