Loose, corroded, or damaged wiring at the rear entertainment control module connector; Faulty rear entertainment control module itself, sending corrupted or out-of-range data; Water intrusion or physical damage to the rear module or its harness from spills or cargo; Low battery voltage or a weak charging system causing modules to send erratic data; A software or firmware glitch in the rear entertainment module requiring a reflash or update; CAN bus (Controller Area Network) wiring faults such as chafed or shorted data lines near the rear module; Aftermarket accessories tapped into the rear entertainment wiring introducing signal interference

DTC codes / U05xx · Network communication / U054A

U054AInvalid Data Received From Entertainment Control Module - Rear B

U054A is a communication fault where a control module on the vehicle's network receives data from the rear entertainment control module (module B) that it considers invalid or corrupted. The receiving module has detected that the messages from the rear entertainment control module are missing expected values, out of range, or otherwise unusable, so it sets this code and may disable features that depend on that data.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaNetwork communication

Symptoms you may notice

Rear entertainment screen or controls may be unresponsive or show a blank display
Audio or video playback from the rear system may fail to start or cut out intermittently
The infotainment head unit may display a communication error or freeze when accessing rear controls
Rear seat passengers may be unable to adjust volume, source, or climate settings through the rear controller
Often no symptoms besides the warning light, especially if the invalid data affects only non-critical functions
Other modules on the same network may log unrelated communication codes if the fault disrupts the bus

Common causes, most likely first

Loose, corroded, or damaged wiring at the rear entertainment control module connector
Faulty rear entertainment control module itself, sending corrupted or out-of-range data
Water intrusion or physical damage to the rear module or its harness from spills or cargo
Low battery voltage or a weak charging system causing modules to send erratic data
A software or firmware glitch in the rear entertainment module requiring a reflash or update
CAN bus (Controller Area Network) wiring faults such as chafed or shorted data lines near the rear module
Aftermarket accessories tapped into the rear entertainment wiring introducing signal interference

How to diagnose and fix it

Verify battery voltage and charging system output, as low voltage can cause invalid data from multiple modules
Inspect the rear entertainment control module connector and harness for corrosion, loose pins, or water damage
Check for aftermarket wiring or accessories spliced into the rear entertainment circuit and remove if present
Use a scan tool to read live data and confirm whether the rear module is communicating and what values it reports
Perform a wiggle test on the rear module harness while watching live data to catch intermittent connection faults
If wiring and power are good, reflash or update the rear entertainment module software per the manufacturer's procedure
If the module still sends invalid data after all checks, replace the rear entertainment control module and relearn or configure it

What most technicians overlook on U054A

A weak or failing battery often causes multiple modules to send invalid data, so U054A can be a symptom of a power problem rather than a rear module failure.
The rear entertainment control module may share a bus segment with other rear-seat modules, so a fault in a neighbouring module can corrupt data and set U054A even if the rear module itself is fine.
Aftermarket rear-seat screens, DVD players, or phone chargers plugged into the rear entertainment system can back-feed voltage or noise onto the data lines and trigger this code.
Some vehicles require a specific wake-up sequence or ignition cycle for the rear module to report valid data, so a code set during a low-voltage event may not return after clearing.
The code does not always mean the rear module is defective; a chafed harness behind a seat or in a liftgate hinge area can intermittently short the data lines and cause invalid data only on rough roads.

Can I keep driving with U054A?

This code affects entertainment and convenience features and does not compromise steering, braking, or engine operation, so the vehicle is safe to drive. Avoid relying on the rear entertainment system until the fault is repaired, and address any low battery or charging issue promptly to prevent further communication faults.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.