High Speed CAN Communication Bus Performance
2012-2015 BMW 320i 2.0L I4 Turbo N20
Description
The high-speed CAN bus is operational but data integrity or timing is degraded. Bus communication is intermittent or corrupted.
Symptoms
- Intermittent warning lights
- Sporadic communication errors
- Occasional system dropouts
- Scan tool intermittent connection
Common Causes
- Partially damaged CAN wiring
- Corroded CAN bus connector
- Weak termination resistor
- Electromagnetic interference
- Module with degraded CAN transceiver
Diagnostic Steps
- Scope CAN H and CAN L for signal quality
- Check CAN bus termination resistance
- Inspect wiring for partial damage
- Check for aftermarket devices on bus
- Isolate modules to find degraded transceiver
Repair Notes
Intermittent CAN issues often caused by corroded connectors or partially damaged wiring. Check all CAN bus splices.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- 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
U0002 on Other Vehicles
Common Questions
What does code U0002 mean on a 2012-2015 BMW 320i?
U0002 stands for "High Speed CAN Communication Bus Performance". The high-speed CAN bus is operational but data integrity or timing is degraded. Bus communication is intermittent or corrupted.
What are the symptoms of U0002 on a BMW 320i?
Common symptoms of U0002 include: Intermittent warning lights, Sporadic communication errors, Occasional system dropouts, Scan tool intermittent connection.
What causes U0002 on a 2012-2015 BMW 320i?
Common causes of U0002 include: Partially damaged CAN wiring, Corroded CAN bus connector, Weak termination resistor, Electromagnetic interference, Module with degraded CAN transceiver.