U0154Lost Communication With Restraints Occupant Classification System Module
- Generic OBD-II code · Network
- How the car detects it
- U0154 is stored when the occupant classification module goes silent. This unit evaluates sensors in the front passenger seat, such as a weight mat or pressure bladder, and tells the airbag controller whether the seat is empty, holds a child seat or an adult, so that the passenger airbag can be suppressed or allowed. Chrysler is the maker found documenting the code: its restraint controller fault list, submitted to NHTSA in investigation PE11-019, names U0154 as lost communication with the occupant classification module, next to B223D for a fault reported by that module itself. Mercedes-AMG is a special case: on 2023 C- and S-Class models U015400 appears in the AMG drive unit with the engine lamp, put down to Ethernet wake-up timing. Normally the airbag lamp and passenger airbag indicator react. U0455 is invalid data from this module.
- What you may notice
- Airbag warning lamp on
- Passenger airbag on/off indicator wrong or flashing
- Passenger airbag deactivated or in a default state
- Likely causes
- LikelyConnector under the passenger seat loose, damaged or pulled during seat work
- PossiblePower or ground of the classification module missing
- PossibleClassification module or seat sensor internally faulty
- RareNetwork wake-up timing or software issue (Mercedes-AMG 2023)
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.