2E7C - P16C6

2020 BMW 128i Coupe (E82) L6-3.0L (N51) Diagnostic Trouble Codes ( DTC ): Service instruction

none

2E7C

2E7C - P16C6

Information saved in

DME

Fault code

2E7C - P16C6

Fault text

Bit-serial data interface, signal

Fault description

CAN Timeout BSD (Bit Serial Data Interface)

Condition for fault identification

Test condition:

BSD bus monitor

Terminal condition: Terminal 15 ON Voltage condition:

Terminal 87 >10.0 V

Condition for fault memory entry

Via event counter.

Total failure between BSD bus and all components (water pump, oil sensor, alternator, battery sensor over approximately 3 sec.

Action in service

Disconnect all BSD_components (alternator, battery sensor, water pump) except for the oil sensor. Clear fault memory. Ignition off/on. If fault code is stored again: QLT is defective and must be replaced. Repeat test.

If fault code is entered again after QLT replacement: -> Check wiring harness (BSD_BUS) and all plug-in connections for corrosion and shorts to ground/UBatt.

If fault code no longer appears after QLT replacement: -> QLT was defective.

If no fault code is stored after all components (except QLT, as in 1.) are disconnected: -> The fault lies with one of the other BSD_components. Now connect the water pump and clear all fault memories, ignition off/on.

If no fault code is entered now, with the water pumpand QLT connected -> Connect alternator.

If no fault code is stored with water pump, QLT and alternator connected -> Connect battery sensor.

If the system now operates with all BSD components, and no fault has been detected, recheck the plug connections in the wiring harness and at the components for good contact / corrosion.

Fault effect and breakdown warning

Driver information

Warning light:

No oil level display/no oil temperature display available. Service interval calculations for next visit are based on model. Water pump runs at 100 % cooling capacity and draws continuous current of approximately 15A.

Power management fails to operate correctly because it is not possible to read battery sensor.