U0170
NetworkModule Communicationlow severityLost Communication with Blind Spot Detection Module
What U0170 Means
Cannot communicate with the blind spot monitoring system module.
Symptoms
- Blind spot indicators not working
- BSM warning light
- Blind spot system disabled message
- Side mirror indicators off
Common Causes
- BSM module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- BSM sensor blocked or damaged
Diagnostic Steps
- Check BSM module fuse
- Test power and ground
- Check CAN wiring
- Inspect BSM sensors in rear bumper
- Clean sensor area
- Test module with diagnostics
Where to start: Check fuses. BSM sensors in rear bumper can be damaged or blocked by dirt/ice.
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