OBD-II code · Network
U02BC Lost Communication With Localization and Mapping Module
The vehicle bus reports loss of communication with the localization and mapping module (HD map / SLAM ECU for ADAS and autonomous functions). Lane-level localization and map-based predictions are unavailable.
Is it safe to drive with U02BC?
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
- Localization Mapping Module, Vehicle Bus Wiring
Related codes
- U02B9Lost Communication With Rear Radar Module D
- U02BALost Communication With Hybrid/EV Electronics Coolant Pump B
- U02BBLost Communication With EVAP System Purge Pump
- U02BDLost Communication With Night Vision Control Module
- U02BELost Communication With Trailer Backup Assist Control Module
- U02BFLost Communication With Interior Lighting Control Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.