U02B9
Lost Communication With Rear Radar Module D
U02B9 is an OBD-II diagnostic trouble code meaning: Lost Communication With Rear Radar Module D. Common causes: broken or damaged wires to the rear radar, rear radar module malfunction. Estimated repair cost: $56–278.
Symptoms
- Rear parking sensors do not work
- Disabling the Blind Spot Warning System
- Error message on the dashboard
- The Check Engine or other systems light comes on
- Inability to activate parking assist features
Causes
- Broken or damaged wires to the rear radar
- Rear radar module malfunction
- Connector problems or contact corrosion
- Failures in ECU software
- Radar module power supply problems
How to Fix
- Check the integrity of the wiring to the rear radar
- Inspect connectors for corrosion or damage
- Check the power and ground of the radar module
- Scan the radar module for errors
- If necessary, replace the rear radar module
- Repair only from an authorized dealer
Related codes
Error U02B9 by Vehicle Brand
FAQ
What does the U02B9 code mean?
U02B9 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Rear Radar Module D
What causes a U02B9 error code?
The most common causes of U02B9 include: Broken or damaged wires to the rear radar; Rear radar module malfunction; Connector problems or contact corrosion; Failures in ECU software.
How do I fix a U02B9 diagnostic trouble code?
To fix U02B9: Check the integrity of the wiring to the rear radar. Inspect connectors for corrosion or damage. Check the power and ground of the radar module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U02B9?
Do not drive — repair immediately
How much does it cost to fix U02B9?
The estimated repair cost for U02B9 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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