P02CA

428B - P02CA

Information saved in
DDE

Fault code
428B - P02CA

Fault text
DDE: Boost-pressure control, low-pressure stage, control
deviation: Charge-air pressure too high/negative control
deviation

Fault description
Monitoring of low-pressure boost pressure control. A
negative control deviation (boost pressure too high) is
recognized when the low-pressure boost-control deviation is
less than a limit defined according to the instantaneous
operational status.
The limit for monitoring the control deviation is determined
using a program map and is based on engine speed and
injection quantity or internal torque.

Condition for fault identification
Test condition:
Monitoring for persistent control deviation is implemented
when the engine is in operating range 3 or 4 and the low-
pressure boost-pressure control is active.
- Operating range 3 is active when the injection quantity
exceeds 22 mg/hub and the engine speed is greater than
2500 1/min.
- Operating range 4 is active when the injection quantity
exceeds 35 mg/hub and the engine speed is greater than
4000 1/min.
When compliance with the above conditions is present, the
error is checked continuously once the debounce time has
elapsed.
Voltage condition:
Monitoring for persistent control deviation is implemented
when the engine is in operating range 3 or 4 and the low-
pressure boost-pressure control is active.
- Operating range 3 is active when the injection quantity
exceeds 22 mg/hub and the engine speed is greater than
2500 1/min.
- Operating range 4 is active when the injection quantity
exceeds 35 mg/hub and the engine speed is greater than
4000 1/min.
When compliance with the above conditions is present, the
error is checked continuously once the debounce time has
elapsed.

Condition for fault memory entry
Debounce (3000 ms)

Action in service
1. Check mass airflow system for leaks.
2. Check boost pressure sensor.
3. Check operation of the following components and inspect
for tampering:
- Turbine control flap.
- Wastegate valve (can seize in closed position).

Fault effect and breakdown warning
Active torque reduction.
Do not drive at WOT/full throttle, component hazard
possible..
The error disables regeneration in the particulate filter.
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL_SVS

Service instruction
- Check for diagnostic trouble codes for the named
components.