Lost Communication with Yaw Rate Sensor Module
2003-2003 Mazda B2300 2.3L I4
The 2003 Mazda B2300 is equipped with a 2.3L inline-4 engine. Below you'll find detailed u0123 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Cannot communicate specifically with the yaw rate sensor that measures vehicle rotation.
Symptoms
- Stability control disabled
- ESC warning light
- Yaw rate data unavailable
- Traction control off
Common Causes
- Yaw rate sensor failure
- Wiring damage
- Module power loss
- CAN bus issue
- Sensor mounting loose
Diagnostic Steps
- Check sensor fuse
- Test sensor power and ground
- Check CAN bus wiring
- Inspect sensor mounting
- Test sensor output
Repair Notes
Yaw rate sensor typically mounted centrally in vehicle. Check mounting and wiring.
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
U0123 on Other Vehicles
Common Questions
What does code U0123 mean on a 2003-2003 Mazda B2300?
U0123 stands for "Lost Communication with Yaw Rate Sensor Module". Cannot communicate specifically with the yaw rate sensor that measures vehicle rotation.
What are the symptoms of U0123 on a Mazda B2300?
Common symptoms of U0123 include: Stability control disabled, ESC warning light, Yaw rate data unavailable, Traction control off.
What causes U0123 on a 2003-2003 Mazda B2300?
Common causes of U0123 include: Yaw rate sensor failure, Wiring damage, Module power loss, CAN bus issue, Sensor mounting loose.
Last updated: March 2026