U0130moderate severityNetwork
Lost Communication with Trailer Brake Control Module
on 2021 Mazda MX-5 Miata 2.0L I4 · RWD
What this code means
Cannot communicate with the integrated trailer brake controller.
Symptoms
- Trailer brake warning light
- Trailer brakes not functioning
- Trailer brake gain not adjustable
- Towing mode limited
Common causes
- Trailer brake module failure
- Trailer wiring issue
- CAN bus wiring
- Module power loss
- Fuse blown
Diagnostic steps
- Check trailer brake module fuse
- Test module power and ground
- Check trailer connector wiring
- Inspect CAN wiring
- Test trailer brake output
Repair notes
Check trailer wiring connector first. Verify factory trailer brake module power supply.
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