U0074
NetworkModule Communicationhigh severityControl Module Communication Bus G Open
What U0074 Means
The G communication bus circuit is open, breaking the data connection between modules. Affected modules stop sharing information.
Symptoms
- Lost communication
- Dash warning lights
- Features not working
Common Causes
- Open bus G wiring
- Broken connector pin
- Loose connection
- Faulty control module
Diagnostic Steps
- Scan network for U-codes
- Check bus G continuity
- Inspect connectors
- Repair open circuit or replace module
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