2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 69
Information saved in
DME
Fault code
2A3E - P1078
Fault text
Valvetronic, actuator motor: overload
Fault description
VVT-Overload Protection Control Motor Current High
Input (Bank 1)
Condition for fault identification
Test condition:
Monitoring of servo motor overload;
The VVT servo motor temperature is calculated in the DME
using a model. The first stage occurs when it heats beyond a
warning threshold (fault #10819, fault class 2). This is 190
锟斤拷C (VVT motor temperature) and causes the VVT to revert
to operation in its emergency mode. If the VVT motor were
to overheat even further, the VVT system would be
completely deactivated upon reaching the deactivation
threshold (200 锟斤拷C VVT motor temperature).
Terminal condition: Terminal 15 ON
Voltage condition:
none
Condition for fault memory entry
Warning threshold: 190 锟斤拷C VVT Servo motor temperature
Deactivation threshold: 200 锟斤拷C VVT servo motor
temperature
Action in service
1. Check VVT servo motor
2. Allow servo motor to cool, Clear fault memory and verify
that DME software is the most recent version
3. DO NOT replace 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
2A3F - P1055 (DME)
2A3F - P1055
Information saved in
DME
Fault code
2A3F - P1055
Fault text
Valvetronic, actuator motor: power supply
Fault description
VVT-Supply Voltage Control Motor High Input (Bank 1)
Condition for fault identification
Test condition:
VVT servo motor power supply monitor
