What does code U0443 mean?

Q: What does code U0443 mean?

Invalid Data Received From Body Control Module B. U0443 indicates that a control module on the vehicle's controller area network (CAN) received invalid or corrupted data from the body control module (BCM) 'B'. The receiving module detected that the BCM's messages were missing expected values, out of range, or failed a checksum, so it flagged the communication as unreliable rather than treating the data as valid.

DTC codes / U04xx · Invalid data received from a module / U0443

U0443Invalid Data Received From Body Control Module B

U0443 indicates that a control module on the vehicle's controller area network (CAN) received invalid or corrupted data from the body control module (BCM) 'B'. The receiving module detected that the BCM's messages were missing expected values, out of range, or failed a checksum, so it flagged the communication as unreliable rather than treating the data as valid.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaInvalid data received from a module

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