U0142moderate severityNetwork
Lost Communication with Body Control Module B
on 2018 Mazda Mazda3 2.5L I4 · FWD
What this code means
Cannot communicate with the secondary body control module.
Symptoms
- Partial body electronics failure
- Some lights not working
- Partial lock/unlock failure
- Specific body features down
Common causes
- BCM B failure
- CAN bus wiring issue
- Module power loss
- Fuse blown
- Water damage
Diagnostic steps
- Check BCM B fuse
- Test power and ground
- Check CAN wiring
- Inspect for water damage
- Check BCM B connector
Repair notes
Check fuses and look for water intrusion. Secondary BCMs are common on larger vehicles.
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