What does code U0543 mean?

Q: What does code U0543 mean?

Invalid Data Received From Headlamp Control Module B. U0543 indicates that a control module, typically the body control module (BCM), has received invalid or missing data from the headlamp control module over the vehicle's communication network. The computer detected a message from the headlamp control module that was either corrupted, out of range, or not properly formatted, so it flagged the data as invalid.

DTC codes / U05xx · Network communication / U0543

U0543Invalid Data Received From Headlamp Control Module B

U0543 indicates that a control module, typically the body control module (BCM), has received invalid or missing data from the headlamp control module over the vehicle's communication network. The computer detected a message from the headlamp control module that was either corrupted, out of range, or not properly formatted, so it flagged the data as invalid.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaNetwork communication

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