U054A code meaning
Invalid Data Received From Entertainment Control Module — Rear B
What U054A means
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.
U054A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U054A
- Second rear screen shows no picture or wrong source
- Headphones or remote of that screen do not respond
Common causes of U054A
- PossibleRear entertainment unit B internally faulty
- PossibleStrained wiring through seat, headrest or headliner to unit B
- Less likelySoftware level of unit B not matching the front unit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rear entertainment module b
What each part of U054A means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4A | The exact fault in that area. |
What to do next
- Note U054A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U054A
What does U054A mean?
U054A means "Invalid Data Received From Entertainment Control Module — Rear B". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U054A?
U054A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U054A fail an emissions test?
U054A is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U054A to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U054A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.