P228F

4C4E - P228F

Information saved in
DDE

Fault code
4C4E - P228F

Fault text
DDE: Rail-pressure control valve, adaptation: Adaptation
value too high

Fault description
If the learned adaptation factor for the rail pressure control
valve is greater than or equal to the upper limit 1 the
diagnostic trouble code is logged. This means that the
system has drifted and the learned value has reached the
maximum limit.

Condition for fault identification
Test condition:
The adaptation factor is calculated only one time in each
driving cycle. The rail pressure control system must be
operating in closed-loop pressure control mode.
Voltage condition:
The adaptation factor is calculated only one time in each
driving cycle. The rail pressure control system must be
operating in closed-loop pressure control mode.

Condition for fault memory entry
No debouncing.None.

Action in service
Replace rail pressure control valve.

Fault effect and breakdown warning
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL

Service instruction
none