What it means
A receiving module detected implausible data from rear entertainment control module B (rear-seat infotainment). Source select, audio routing or display state values fail plausibility checks and are rejected.
How it works
Rear entertainment control module B sends rear-seat infotainment status, such as source selection, audio routing, and display state, over the vehicle network. A receiving module checks those values for plausibility; U054A sets when it rejects data attributed to this rear entertainment module.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- Gateway module routing CAN messages incorrectly
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
How to diagnose it
- Scan all modules and save U054A, related network codes, and freeze-frame details to see which module rejected the rear entertainment data and under what conditions.
- Check live data for rear entertainment module B's online status and whether source, audio-routing, or display-state values are stable and plausible.
- Inspect the rear entertainment module's connectors, power and ground connections, and network wiring, especially around the rear-seat unit, for damage or looseness.
- Check whether the fault followed replacement or software work, and confirm the rear entertainment module's configuration is compatible with the vehicle.
- If the wiring and configuration are sound, use the manufacturer's network diagnostics to check the module's messages and gateway routing before condemning the module.
Common fixes
- Secure or repair a loose, corroded, or damaged connector or network wire at rear entertainment module B.
- Restore a poor power or ground connection to the rear entertainment unit.
- Correct an incompatible module configuration or software mismatch after replacement.
- Repair or replace rear entertainment module B if its data remains implausible with sound wiring and correct configuration.
- Repair gateway routing if network tests show that rear entertainment messages are being misrouted.
Can I keep driving?
The vehicle is generally drivable if no other systems are affected, but rear-seat displays, audio selection, or routing may fail. Avoid relying on the rear entertainment system until the fault is resolved.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.