U0270
NetworkModule Communicationmoderate severityLost Communication With Body Control Module 'B'
What U0270 Means
The module has lost communication with a secondary body control module over the data bus. This can disable various body electrical functions controlled by that module.
Symptoms
- Body electrical features inoperative
- Warning lights on dash
- Intermittent module functions
Common Causes
- Faulty body control module 'B'
- Damaged CAN bus wiring
- Loss of power or ground to module
- Corroded connectors
Diagnostic Steps
- Scan all modules for stored codes
- Check power and ground at the module
- Test CAN bus wiring continuity and resistance
- Inspect connectors for corrosion or damage
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