U0146
Lost Communication with Gateway Module A
2016-2021 Mazda CX-3 2.0L I4 🇬🇧
High SeverityNetwork
Description
Cannot communicate with the central gateway module that routes data between vehicle networks.
Symptoms
- Multiple systems affected
- Scan tool partial communication
- Cross-network features not working
- Intermittent multi-system faults
Common Causes
- Gateway module failure
- CAN bus wiring issue
- Module power loss
- Fuse blown
- Software corruption
Diagnostic Steps
- Check gateway module fuse
- Test power and ground
- Check CAN wiring on all bus connections
- Try gateway module reprogramming
- Test individual bus segments
Repair Notes
Gateway module connects multiple CAN buses. Failure affects cross-bus communication. Common on German vehicles.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0005High Speed CAN Communication Bus (+) High
U0146 on Other Vehicles
Common Questions
What does code U0146 mean on a 2016-2021 Mazda CX-3?
U0146 stands for "Lost Communication with Gateway Module A". Cannot communicate with the central gateway module that routes data between vehicle networks.
What are the symptoms of U0146 on a Mazda CX-3?
Common symptoms of U0146 include: Multiple systems affected, Scan tool partial communication, Cross-network features not working, Intermittent multi-system faults.
What causes U0146 on a 2016-2021 Mazda CX-3?
Common causes of U0146 include: Gateway module failure, CAN bus wiring issue, Module power loss, Fuse blown, Software corruption.