U0056
LIN Bus B Communication Performance
2001-2005 BMW 325i E46 2.5L I6 🇩🇪
Low SeverityNetwork
Description
Communication on LIN bus B is degraded or intermittent.
Symptoms
- Specific LIN B devices intermittent
- HVAC blend door actuator issues
- Seat heater communication errors
Common Causes
- LIN bus B wiring degradation
- LIN slave device fault on bus B
- High resistance in LIN B circuit
Diagnostic Steps
- Check LIN bus B voltage levels
- Test LIN B wiring resistance
- Inspect LIN B device connections
- Test individual LIN B slave devices
Repair Notes
Check LIN bus B wiring and slave device connections.
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
U0056 on Other Vehicles
Common Questions
What does code U0056 mean on a 2001-2005 BMW 325i E46?
U0056 stands for "LIN Bus B Communication Performance". Communication on LIN bus B is degraded or intermittent.
What are the symptoms of U0056 on a BMW 325i E46?
Common symptoms of U0056 include: Specific LIN B devices intermittent, HVAC blend door actuator issues, Seat heater communication errors.
What causes U0056 on a 2001-2005 BMW 325i E46?
Common causes of U0056 include: LIN bus B wiring degradation, LIN slave device fault on bus B, High resistance in LIN B circuit.