2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 240
Driver information
Warning light:
none
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
1. 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.
2. 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.
3. If fault code no longer appears after QLT replacement: ->
QLT was defective.
4. 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.
5. If no fault code is entered now, with the water pumpand
QLT connected -> Connect alternator.
6. If no fault code is stored with water pump, QLT and
alternator connected -> Connect battery sensor.
7. 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.
