What does code U0501 mean?

Q: What does code U0501 mean?

Invalid Data Received From Door Control Module B. U0501 is a communication fault indicating that a primary control module received invalid or corrupted data from the door control module B over the vehicle's network. The computer detected a message from the door module that failed its internal checksum or contained data outside the expected range, so it flagged the signal as untrustworthy rather than missing entirely.

DTC codes / U05xx · Network communication / U0501

U0501Invalid Data Received From Door Control Module B

U0501 is a communication fault indicating that a primary control module received invalid or corrupted data from the door control module B over the vehicle's network. The computer detected a message from the door module that failed its internal checksum or contained data outside the expected range, so it flagged the signal as untrustworthy rather than missing entirely.

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.