U0129
Lost Communication with Brake System Control Module
2002-2003 BMW X5 4.6is E53 4.6L V8
Critical SeverityNetworkGeneric (SAE)
Description
Cannot communicate with the general brake system control module.
Symptoms
- Brake warning light on
- ABS disabled
- Stability control off
- Brake system message displayed
Common Causes
- Brake module failure
- CAN bus wiring damage
- Module power loss
- Fuse blown
- Water damage
Diagnostic Steps
- Check brake system fuses
- Test module power and ground
- Check CAN wiring
- Inspect module for water damage
- Try direct module communication
Repair Notes
Check fuses and power supply. Inspect for water damage near brake module location.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0129 on Other Vehicles
Common Questions
What does code U0129 mean on a 2002-2003 BMW X5 4.6is E53?
U0129 stands for "Lost Communication with Brake System Control Module". Cannot communicate with the general brake system control module.
What are the symptoms of U0129 on a BMW X5 4.6is E53?
Common symptoms of U0129 include: Brake warning light on, ABS disabled, Stability control off, Brake system message displayed.
What causes U0129 on a 2002-2003 BMW X5 4.6is E53?
Common causes of U0129 include: Brake module failure, CAN bus wiring damage, Module power loss, Fuse blown, Water damage.