U05B4Invalid Data Received From Driver Monitoring System Module
- Generic OBD-II code · Network
- How the car detects it
- A driver monitoring system films the driver's face with an infrared camera to judge attention and drowsiness. Toyota launched it in 2006, Cadillac relies on one to allow hands-free Super Cruise, and EU Regulation 2019/2144 covers it. Subaru stores up to five driver profiles in its DMS control unit and asks technicians to save them before service (bulletin 07-175-20); Stellantis lists a driver monitoring system module (DMSM) among the ADAS units of the 2025 Grand Cherokee that drop features after a deep battery discharge (STAR S2408000086, charge above 90 %, then ten minutes of bus sleep). U05B4 means its gaze or status messages reach the ADAS controller but are invalid. No manufacturer documents U05B4 publicly; hands-free and lane functions are then usually withdrawn. U02B3 covers a silent module.
- What you may notice
- Hands-free or lane assistance not available
- Driver attention warning inactive or triggered without reason
- Service message for driver assistance in the cluster
- Likely causes
- LikelyLow 12 V state of charge or recent battery replacement
- PossibleCamera or infrared emitters covered, dirty or misaligned
- PossibleModule software or calibration not matching the ADAS controller
- RareDriver monitoring module internally defective
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.