U054AInvalid Data Received From Entertainment Control Module — Rear B
- Generic OBD-II code · Network
- How the car detects it
- Some vehicles carry two rear entertainment units, for instance one screen per front headrest or separate units for second and third rows, which J2012 numbers Rear A and Rear B. GM's Saab 9-5 code list shows such a split: U0196 for the rear audio control module and U0249, the lost-communication partner of U054A, for a rear radio audio control module. A GM patent on reprogramming modules notes that rear-seat entertainment often sits on a fast MOST entertainment bus rather than on CAN. U054A means unit B still sends, but its status or control data are rejected; for unit A the code would be U0497. No public bulletin names U054A. Usually only the second rear screen, its headphone channel or its remote control stops working.
- What you may notice
- Second rear screen shows no picture or wrong source
- Headphones or remote of that screen do not respond
- Likely causes
- PossibleRear entertainment unit B internally faulty
- PossibleStrained wiring through seat, headrest or headliner to unit B
- RareSoftware level of unit B not matching the front unit
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.