BMW 328i Sedan (E90) L6-3.0L (N51) P code charts 54
Condition for fault identification
Test condition:
The engine-management system monitors the VVT motor's
current draw. If the monitored current draw exceeds a
defined threshold for several seconds the VVT system is
deactivated (VVT emergency operation mode), and the
engine reverts to throttled operation.
Terminal condition: Terminal 15 ON
Voltage condition:
none
Condition for fault memory entry
always active when DME is awake
current threshold roughly 24A,
Action in service
1. Check for correct reluctor attachment at VVT sensor.
2. Defective VVT servo motor (for instance, interturn short
circuit) Check servo motor and replace as indicated
3. Check wiring harness from VVT motor to DME for shorts
between the two VVT wires and vehicle ground.
4. If abuse is suspected: Clear fault memory from DME
Fault effect and breakdown warning
Driver information
Warning light:
ECE: No warning message. Engine reverts to VVT
emergency backup mode (throttled operation) US: OPEN
Service instruction
none
P107B
2A43 - P107B
Information saved in
DME
Fault code
2A43 - P107B
Fault text
Valvetronic, thermal overload protection: warning threshold
Fault description
VVT-Overload Protection Control Motor Temperature Too
High
Condition for fault identification
Test condition:
A temperature model is employed to monitor the VVT servo
motor. When the calculated VVT motor temperature rises
beyond the warning threshold this fault code is entered.
Terminal condition: Terminal 15 ON
Voltage condition:
none
Condition for fault memory entry
Always active when DME is awake
VVT motor temperature: Warning threshold 190 °C
Action in service
1. Check VVT servo motor
2. Allow engine to cool, let vehicle return to dormant state,
Clear fault memory and verify that DME has most recent
software version
