2010 BMW 128i Convertible (E88) L6-3.0L (N52K) P Code Charts
none
P1023
2A39 – P1023
Information saved in
DME
Fault code
2A39 – P1023
Fault text
Valvetronic, adjustment range
Fault description
VVT-Self-Learning Function Faulty Adjustment Range
(Bank 1)
Condition for fault identification
Test condition:
Adjustment range monitor When travel limit initialization
routine is executed. (travel limit initialization routine is
automatically executed in a 5 hour (engine operating hours)
cycle or with ‘initialize travel limits’ tester request.
Terminal condition: Terminal 15 ON
Voltage condition:
Electrical system voltage Terminal 87 >10.0 V
Condition for fault memory entry
following renewed successful execution of the travel limit
initialization routine
Action in service
1. Use tester request to repeat the VVT travel limit
initialization routine 2. If Item No.1 is not OK, it will be
necessary to check the VVT mechanical components /VVT
servo motor
Fault effect and breakdown warning
Driver information
Warning light:
ECE: No warning message. Engine reverts to VVT
emergency backup mode (throttled operation) US: OPEN
