Lost Communication with Body Control Module B
2001-2001 Mazda MX-5 Miata 1.8L I4
The 2001 Mazda MX-5 Miata is equipped with a 1.8L inline-4 engine. Below you'll find detailed u0142 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
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.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- 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
U0142 on Other Vehicles
Common Questions
What does code U0142 mean on a 2001-2001 Mazda MX-5 Miata?
U0142 stands for "Lost Communication with Body Control Module B". Cannot communicate with the secondary body control module.
What are the symptoms of U0142 on a Mazda MX-5 Miata?
Common symptoms of U0142 include: Partial body electronics failure, Some lights not working, Partial lock/unlock failure, Specific body features down.
What causes U0142 on a 2001-2001 Mazda MX-5 Miata?
Common causes of U0142 include: BCM B failure, CAN bus wiring issue, Module power loss, Fuse blown, Water damage.
Last updated: March 2026