U0154
NetworkModule Communicationhigh severityLost Communication with Gateway Module B
What U0154 Means
Cannot communicate with the secondary gateway module on vehicles with multiple gateway controllers.
Symptoms
- Partial cross-network failure
- Specific bus segment communication loss
- Some modules unreachable
Common Causes
- Gateway B module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Software issue
Diagnostic Steps
- Check gateway B fuse
- Test power and ground
- Check CAN bus connections
- Try module reprogramming
Where to start: Secondary gateway handles specific bus segments. Check fuses and bus connections.
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