OBD Codes List

Diagnostic reference · U05B9

U05B9

Invalid Data Received From Rear Radar Module C

System
Network communication (U code)
Lamp
Check Engine Light
Category
Network Communications

What it means

U05B9 means Invalid Data Received From Rear Radar Module C.

Where it lives

For U05B9, the part to look at first is the module named here.

Check these first

  • A data bus fault on the rear radar module C circuit
  • A failed rear radar module C
  • Loss of power or ground at rear radar module C
  • Damage or water in the rear radar module C connector

What to do next

  1. Read rear radar module C data on a scan tool
  2. Inspect rear radar module C for impact damage and connector corrosion
  3. Check power and ground at rear radar module C
  4. Test the data bus between rear radar module C and the network
  5. Replace rear radar module C if the circuit tests pass
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.