Lost Communication With Blind Spot Monitoring Module
The U0285 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Blind Spot Monitoring Module. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $300 - $1,000 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Blind spot indicators not illuminating
- No alerts when vehicles are in blind spot
- BSM warning light on dashboard
- Rear cross-traffic alert not working
Probable Causes (Ranked by Likelihood)
- Failed blind spot radar sensor Very High
- Sensor blocked by dirt or aftermarket parts High
- CAN bus wiring fault to sensor Moderate
- Rear bumper damage affecting sensor Low
Step-by-Step Diagnostic Procedure
-
Clean blind spot sensor areas on rear bumper
-
Check for bumper damage near sensors
-
Scan BSM module for codes
-
Test each sensor individually
Frequently Asked Questions
Can I drive with U0285?
Yes. Check blind spots manually by turning your head before changing lanes.
What causes U0285?
Often mud or dirt on the rear bumper sensors. Bumper damage from minor impacts is also common.
How much does U0285 cost to fix?
Typically $300 to $1,000 per sensor.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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