U0171
Lost Communication with Lane Departure Module
2019-2024 BMW 3 Series G20 2.0L I4 Turbo B48
Low SeverityNetworkGeneric (SAE)
Description
Cannot communicate with the lane departure warning or lane keeping assist module.
Symptoms
- Lane departure system disabled
- LDW warning light
- Lane keeping assist not available
- Camera error message
Common Causes
- Lane departure module failure
- CAN bus wiring
- Module power loss
- Camera failure
- Windshield calibration needed
Diagnostic Steps
- Check lane departure module fuse
- Test power and ground
- Check CAN wiring
- Inspect windshield camera
- Check for calibration need after windshield replacement
Repair Notes
Check fuses. System often needs recalibration after windshield replacement.
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
U0171 on Other Vehicles
Common Questions
What does code U0171 mean on a 2019-2024 BMW 3 Series G20?
U0171 stands for "Lost Communication with Lane Departure Module". Cannot communicate with the lane departure warning or lane keeping assist module.
What are the symptoms of U0171 on a BMW 3 Series G20?
Common symptoms of U0171 include: Lane departure system disabled, LDW warning light, Lane keeping assist not available, Camera error message.
What causes U0171 on a 2019-2024 BMW 3 Series G20?
Common causes of U0171 include: Lane departure module failure, CAN bus wiring, Module power loss, Camera failure, Windshield calibration needed.