OBD-II code · Network
U02B5 Lost Communication With Front Radar Module B
The vehicle bus reports loss of communication with front radar module B. Adaptive cruise control, automatic emergency braking and forward collision warning lose their primary range/closing-speed input.
Is it safe to drive with U02B5?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Front Radar Module B, Vehicle Bus Wiring
Related codes
- U02B4Lost Communication With Front Radar Module A
- U02B2Lost Communication With Comfort and Convenience Display B
- U02B3Lost Communication With Driver Monitoring System Module
- U02B6Lost Communication With Rear Radar Module A
- U02B7Lost Communication With Rear Radar Module B
- U02B8Lost Communication With Rear Radar Module C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.