2010 BMW 128i Convertible (E88) L6-3.0L (N52K) P Code Charts
none
P105B
2A77 – P105B
Information saved in
DME
Fault code
2A77 – P105B
Fault text
Control module, internal fault: Valvetronic output stage
Fault description
Internal Control Module VVT Error, VoltageToo Low
Condition for fault identification
Test condition:
Undervoltage in power supply to driver circuit has been
detected (ATIC61 diagnosis)
Terminal condition: Terminal 15 ON
Voltage condition:
Battery voltage > 9.953125V and battery voltage <
25.898438V
Condition for fault memory entry
0.2
Action in service
1. Ignition off, let control module return to dormant state as
indicated, restart
2. If Item 1 is not OK, it will be necessary to check the
electronics in the control module
Fault effect and breakdown warning
Driver information
Warning light:
Fault entry in info memory only
