U0006
High Speed CAN Communication Bus (-) Open
2019-2024 BMW 3 Series G20 2.0L I4 Turbo B48
High SeverityNetworkGeneric (SAE)
Description
The CAN Low wire is open, disrupting high-speed CAN communication. CAN L carries the recessive low signal.
Symptoms
- Multiple modules lose communication
- Warning lights on
- Systems go offline intermittently
Common Causes
- Broken CAN L wire
- Corroded CAN L terminal
- Connector damage
- Wiring harness break
Diagnostic Steps
- Measure voltage on CAN L (should be ~2.5V idle, ~1.5V dominant)
- Check continuity of CAN L wire
- Inspect splice points and connectors
- Use scope to verify CAN L waveform
Repair Notes
Locate and repair the open in the CAN L wire.
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
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
- U0028Vehicle Communication Bus A Performance
U0006 on Other Vehicles
Common Questions
What does code U0006 mean on a 2019-2024 BMW 3 Series G20?
U0006 stands for "High Speed CAN Communication Bus (-) Open". The CAN Low wire is open, disrupting high-speed CAN communication. CAN L carries the recessive low signal.
What are the symptoms of U0006 on a BMW 3 Series G20?
Common symptoms of U0006 include: Multiple modules lose communication, Warning lights on, Systems go offline intermittently.
What causes U0006 on a 2019-2024 BMW 3 Series G20?
Common causes of U0006 include: Broken CAN L wire, Corroded CAN L terminal, Connector damage, Wiring harness break.