U0001
High Speed CAN Communication Bus
1999-2000 BMW 323i E46 2.5L I6 🇨🇦
High SeverityNetwork
Description
General malfunction on the high-speed CAN bus network.
Symptoms
- Multiple warning lights
- Communication errors
- Some systems inoperative
- Scan tool communication issues
Common Causes
- CAN bus wiring damage
- Shorted CAN H or CAN L wire
- Missing termination resistor
- Module failure pulling down bus
- Aftermarket device interference
Diagnostic Steps
- Check for aftermarket devices on OBD port
- Measure CAN bus resistance (should be ~60 ohms)
- Scope CAN H and CAN L signals
- Check for damaged wiring
- Isolate modules one at a time
Repair Notes
CAN bus issues can be complex. Check wiring first. Remove aftermarket devices.
Related Codes
Other Network Codes
- 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
- U0028Vehicle Communication Bus A Performance
U0001 on Other Vehicles
Common Questions
What does code U0001 mean on a 1999-2000 BMW 323i E46?
U0001 stands for "High Speed CAN Communication Bus". General malfunction on the high-speed CAN bus network.
What are the symptoms of U0001 on a BMW 323i E46?
Common symptoms of U0001 include: Multiple warning lights, Communication errors, Some systems inoperative, Scan tool communication issues.
What causes U0001 on a 1999-2000 BMW 323i E46?
Common causes of U0001 include: CAN bus wiring damage, Shorted CAN H or CAN L wire, Missing termination resistor, Module failure pulling down bus, Aftermarket device interference.