OBD-II code · Network
U02B3 Lost Communication With Driver Monitoring System Module
The vehicle bus reports loss of communication with the driver monitoring system (DMS) module. Eye/head-pose tracking for drowsiness, distraction and hands-on detection is unavailable, and dependent ADAS handover features may be inhibited.
Is it safe to drive with U02B3?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
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
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Driver Monitoring Module, Vehicle Bus Wiring
Related codes
- U02B0Lost Communication With Turbocharger/Supercharger Boost Control B Position Sensor
- U02B1Lost Communication With Comfort and Convenience Display A
- U02B2Lost Communication With Comfort and Convenience Display B
- U02B4Lost Communication With Front Radar Module A
- U02B5Lost Communication With Front Radar Module B
- U02B6Lost Communication With Rear Radar Module A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.