U1041
Communication Bus Initialization Failure
2019-2024 BMW 3 Series G20 2.0L I4 Turbo B48
Moderate SeverityNetworkGeneric (SAE)
Description
The communication bus failed to initialize properly during vehicle startup.
Symptoms
- Systems slow to come online
- Extended crank before modules respond
- Features not available immediately after start
- Delayed warning light checks
Common Causes
- Module power-up sequence issue
- Bus termination problem
- Module not completing initialization
- Power supply slow to stabilize
- Gateway module slow to boot
Diagnostic Steps
- Check power supply voltage during cranking
- Monitor bus initialization with scope
- Check gateway module boot sequence
- Verify module power-up order
- Test battery and charging system
Repair Notes
Check battery condition and power supply during cranking. Weak battery causes slow initialization.
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
U1041 on Other Vehicles
Common Questions
What does code U1041 mean on a 2019-2024 BMW 3 Series G20?
U1041 stands for "Communication Bus Initialization Failure". The communication bus failed to initialize properly during vehicle startup.
What are the symptoms of U1041 on a BMW 3 Series G20?
Common symptoms of U1041 include: Systems slow to come online, Extended crank before modules respond, Features not available immediately after start, Delayed warning light checks.
What causes U1041 on a 2019-2024 BMW 3 Series G20?
Common causes of U1041 include: Module power-up sequence issue, Bus termination problem, Module not completing initialization, Power supply slow to stabilize, Gateway module slow to boot.