U0154high severityNetwork
Lost Communication with Gateway Module B
on 2019 Mazda Mazda3 2.0L I4 · AWD
What this code means
Cannot communicate with the secondary gateway module on vehicles with multiple gateway controllers.
Symptoms
- Partial cross-network failure
- Specific bus segment communication loss
- Some modules unreachable
Common causes
- Gateway B module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Software issue
Diagnostic steps
- Check gateway B fuse
- Test power and ground
- Check CAN bus connections
- Try module reprogramming
Repair notes
Secondary gateway handles specific bus segments. Check fuses and bus connections.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus