U2004
Network Configuration Not Learned
2016-2021 Mazda CX-3 2.0L I4 🇬🇧
Moderate SeverityNetwork
Description
The vehicle network configuration has not been learned or stored after module replacement or reset.
Symptoms
- Systems not communicating properly
- Features missing after service
- Modules not recognizing each other
- Network topology error
Common Causes
- Battery disconnect without relearn
- Module replacement without network setup
- Configuration data lost
- Programming interrupted
Diagnostic Steps
- Perform network configuration learn procedure
- Run module discovery scan
- Program as-built data
- Perform SBL (System Bus Learn)
- Complete post-service initialization
Repair Notes
Run network configuration or module discovery procedure. Required after replacing network modules.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0005High Speed CAN Communication Bus (+) High
U2004 on Other Vehicles
Common Questions
What does code U2004 mean on a 2016-2021 Mazda CX-3?
U2004 stands for "Network Configuration Not Learned". The vehicle network configuration has not been learned or stored after module replacement or reset.
What are the symptoms of U2004 on a Mazda CX-3?
Common symptoms of U2004 include: Systems not communicating properly, Features missing after service, Modules not recognizing each other, Network topology error.
What causes U2004 on a 2016-2021 Mazda CX-3?
Common causes of U2004 include: Battery disconnect without relearn, Module replacement without network setup, Configuration data lost, Programming interrupted.