U0128critical severityNetwork
Lost Communication with Brake Boost Control Module
on 2024 Mini Cooper SE Electric · FWD
What this code means
Cannot communicate with the power brake booster control module on vehicles with electric brake boost.
Symptoms
- Brake pedal feels hard
- Brake boost warning light
- Increased stopping distance
- Brake assist not available
Common causes
- Electric brake booster module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Brake booster motor failure
Diagnostic steps
- Check brake booster module fuse
- Test module power and ground
- Check CAN wiring
- Test brake booster motor
- Check brake fluid level
Repair notes
Safety critical. Brakes still function but with no power assist. Check fuses and power supply.
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Other Network codes on this vehicle
CC-ID-181
System Check Failed
CC-ID-207
Central Electronics Failure, Stop Vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High